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浅谈河蟹塘中泥浆水的处理
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《科学养鱼》 北大核心 2014年第4期86-86,共1页
随着气温的上升,河蟹的活动逐渐活跃,在投饵不足或者气温突变的情况下,河蟹的活动比平常会加剧很多,同时浮游动物的大量繁殖也会引起河蟹的剧烈活动,早期池塘水位比较浅,而水草还没有布满池塘,河蟹的这样大量活动往往会导致池塘... 随着气温的上升,河蟹的活动逐渐活跃,在投饵不足或者气温突变的情况下,河蟹的活动比平常会加剧很多,同时浮游动物的大量繁殖也会引起河蟹的剧烈活动,早期池塘水位比较浅,而水草还没有布满池塘,河蟹的这样大量活动往往会导致池塘底泥的悬浮,形成泥浆胶体浑浊,尤其是新种水草的池塘,水草覆盖面积很小,这种情况尤其明显。 展开更多
关键词 泥浆水 池塘 蟹塘 气温突变 浮游动物 覆盖面积 河蟹
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水不分散材料对水泥浆抗水侵性能影响
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作者 焦亚军 张华 +4 位作者 郭雪利 张晓兵 刘波 邓天安 张顺平 《钻井液与完井液》 CAS 北大核心 2024年第3期383-389,共7页
川渝地区页岩气储层嘉陵江组裂缝性地层发育、地层水活跃,在钻井过程中出现较为突出的漏失问题,对钻井周期产生很大影响,制约了页岩气井的安全高效开采。针对页岩气井出现的漏失问题,对水不分散水泥浆体系进行研究,对5种多糖类聚合物和... 川渝地区页岩气储层嘉陵江组裂缝性地层发育、地层水活跃,在钻井过程中出现较为突出的漏失问题,对钻井周期产生很大影响,制约了页岩气井的安全高效开采。针对页岩气井出现的漏失问题,对水不分散水泥浆体系进行研究,对5种多糖类聚合物和有机聚合物材料进行水不分散性能评价,优选出关键材料种类及配比,形成适用于含水漏失层封堵的低密度水不分散水泥浆体系,结合平衡压力堵漏工艺,保证水泥浆注替至漏失层后不被地层水冲散,实现漏失地层的有效封堵,为后续施工创造了条件。低密度水不分散水泥浆体系在川渝地区Z203H6-X页岩气漏失井中成功应用,地层承压当量密度由0.99 g/cm^(3)提高到1.21 g/cm^(3),后续结合堵漏浆强化堵漏,地层承压当量密度提升至1.81 g/cm^(3),为川渝地区页岩气井含水裂缝型地层漏失问题提供了一种技术手段。 展开更多
关键词 不分散泥浆 裂缝层漏失 当量密度 多糖 高分子聚合物 页岩气井
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饱和状态下水泥浆体的微观结构冰冻损伤模型 被引量:7
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作者 刘琳 孙伟 +2 位作者 陈惠苏 叶光 钱智炜 《东南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2011年第5期1059-1064,共6页
为了研究水转化为冰所带来的体积膨胀对水泥浆体的微观结构的危害,量化微观结构的内部损伤,建立了一个饱水状态下水泥浆体的冰冻破坏模型.首先使用模拟水泥浆体微观结构的数值模型(HYMOSTRUC)生成一个模拟结构,根据这个模拟结构中的孔结... 为了研究水转化为冰所带来的体积膨胀对水泥浆体的微观结构的危害,量化微观结构的内部损伤,建立了一个饱水状态下水泥浆体的冰冻破坏模型.首先使用模拟水泥浆体微观结构的数值模型(HYMOSTRUC)生成一个模拟结构,根据这个模拟结构中的孔结构,分析水分在孔隙中发生的相转变;将含有冰、水和水化产物的水泥浆体微观模拟结构转变为三维格构结构,并把水分发生相变时产生的体积膨胀引入其中,从而分析格构结构的受力及断裂;最后得到水泥浆体微结构内部微裂缝的分布.该模型真实反映了冰冻作用对微观结构的破坏,模拟结果显示微裂缝产生在由水转变为冰的孔隙周围的抗拉强度低的固相水化产物中. 展开更多
关键词 泥浆 微观结构 冰冻破坏 三维格构结构
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海水侵入条件下泥水盾构泥浆及泥膜性质变化试验研究 被引量:8
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作者 杜佳芮 闵凡路 +2 位作者 姚占虎 刘来仓 徐静波 《隧道建设(中英文)》 北大核心 2018年第7期1182-1188,共7页
为探究采用泥水盾构进行海底隧道建设时,海水易从开挖面进入泥水舱并与泥浆混合,导致泥浆泌水率等参数发生变化,进而影响泥膜的性质和开挖面的稳定性问题,配制不同海水添加量的泥浆,测试泥浆的泌水率、黏度和ζ电位等参数变化,并对泥膜... 为探究采用泥水盾构进行海底隧道建设时,海水易从开挖面进入泥水舱并与泥浆混合,导致泥浆泌水率等参数发生变化,进而影响泥膜的性质和开挖面的稳定性问题,配制不同海水添加量的泥浆,测试泥浆的泌水率、黏度和ζ电位等参数变化,并对泥膜的孔隙比、渗透系数等参数进行测试。试验表明:1)海水的侵入明显增大了泥浆的泌水率,降低了泥浆的黏度和ζ电位。2)随着海水添加量的增加,泥膜的孔隙比降低,渗透系数由10^(-9)cm/s增大到10^(-7)cm/s。3)导致泥浆泌水率及泥膜渗透系数变化的根本原因是随着海水的添加,泥浆的ζ电位逐渐降低,泥浆颗粒间斥力减弱,宏观上表现为快速沉淀、析水;同时,由于泥浆颗粒吸引的阳离子增多,结合水膜变薄,形成泥膜的有效孔隙变大,宏观上表现为渗透系数增大。 展开更多
关键词 盾构 泥浆 泥浆黏度 Ζ电位 泥膜渗透系数
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不同阳离子对泥水盾构泥浆稳定性影响试验研究 被引量:6
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作者 孙金鑫 钟小春 +2 位作者 付伟 罗近海 邓有春 《岩土工程学报》 EI CAS CSCD 北大核心 2020年第8期1525-1531,共7页
针对泥水盾构在滨海地区或海底掘进时含盐地层侵入会导致泥浆稳定性下降的问题,通过向泥浆中掺入盐溶液,测试泥浆泌水率、■电位、特征粒径、滤失量等参数变化,利用胶体絮凝机理分析泥浆在不同盐溶液掺入下的稳定性。试验表明:①相较于... 针对泥水盾构在滨海地区或海底掘进时含盐地层侵入会导致泥浆稳定性下降的问题,通过向泥浆中掺入盐溶液,测试泥浆泌水率、■电位、特征粒径、滤失量等参数变化,利用胶体絮凝机理分析泥浆在不同盐溶液掺入下的稳定性。试验表明:①相较于掺入淡水,向膨水比为1∶15的泥浆中掺入浓度为1%的盐溶液时,泥浆■电位下降、特征粒径增大、滤失量增加;②盐溶液通过降低■电位和稀释作用影响泥浆稳定性。当掺入比超过5%后,继续掺入时,若盐溶液为NaCl则泥浆特征粒径d10继续增大而d50,d85基本不变,泥浆颗粒絮集、不泌水;若盐浓液为CaCl2、MgCl2,则特征粒径d10,d50,d85均基本不变,泥浆出现絮降、泌水;③Ca^2+、Mg^2+比Na^+对泥浆稳定性影响更大,故在不同海域采用泥水盾构掘进时,应根据地下水盐分含量及种类有针对性地考虑其对泥浆稳定性的影响。 展开更多
关键词 盾构 泥浆 ■电位 盐溶液 絮凝作用 泥浆滤失量
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水不分散水泥浆的机理探讨与性能评价 被引量:6
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作者 王建瑶 涂思琪 +3 位作者 梅明佳 辛海鹏 孙富全 邹双 《钻井液与完井液》 CAS 北大核心 2020年第3期358-362,共5页
基于胶体稳定理论、双电层压缩及吸附架桥原理,对水不分散水泥浆体系作用机理进行了探讨,并采用扫描电镜分析(SEM)进一步证明抗分散絮凝剂BCY-100S对水泥颗粒的架桥凝聚作用。评价了多种减阻剂对水不分散水泥浆流变性能和抗分散性能的影... 基于胶体稳定理论、双电层压缩及吸附架桥原理,对水不分散水泥浆体系作用机理进行了探讨,并采用扫描电镜分析(SEM)进一步证明抗分散絮凝剂BCY-100S对水泥颗粒的架桥凝聚作用。评价了多种减阻剂对水不分散水泥浆流变性能和抗分散性能的影响,优选出能改善流变且不影响抗分散性能的BCD-200S作为配套减阻剂。评价了3种水灰比分别为0.45、0.47和0.50的水不分散水泥在30~80℃的抗分散性能、力学性能及其综合性能,结果表明,水灰比增大不影响水不分散水泥浆的抗分散性,水不分散水泥浆的游离液量为0 mL,上下密度差不大于0.03 g/cm3,流动度不小于20 cm,失水量可控制在50 mL以内,其力学性能满足施工要求。 展开更多
关键词 不分散泥浆 机理 固井
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立式砂仓浓缩浮选尾泥浆试验研究 被引量:3
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作者 王晖 王方汉 陈德彪 《矿冶工程》 CAS CSCD 北大核心 2001年第4期39-41,共3页
通过静态、动态以及工业试验 ,研究了复配絮凝剂Xn处理成份复杂、浓度波动大、粒度极细的浮选尾泥浆的效果。在Xn用量仅为 5mg/L情况下 ,尾泥浆在立式砂仓中浓缩沉降 ,溢流水符合国家排放标准并可完全回收利用 ,砂仓底流连续放砂浓度达... 通过静态、动态以及工业试验 ,研究了复配絮凝剂Xn处理成份复杂、浓度波动大、粒度极细的浮选尾泥浆的效果。在Xn用量仅为 5mg/L情况下 ,尾泥浆在立式砂仓中浓缩沉降 ,溢流水符合国家排放标准并可完全回收利用 ,砂仓底流连续放砂浓度达到 5 6 %以上 ,满足后续充填作业要求。该工艺为矿山实现无尾排放创造了条件。 展开更多
关键词 絮凝剂 泥浆水处理 浮选尾矿 立式砂仓
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某城市建筑泥浆污染现状调查研究 被引量:1
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作者 常红晨 张吕林 +4 位作者 邢松明 朱逸凡 张春雷 李磊 陈森 《环境监测管理与技术》 CSCD 2022年第1期68-71,共4页
以某城市为例,研究城市建筑泥浆的污染现状,并分析泥浆受到污染的原因。结果表明:对照《地表水环境质量标准》(GB 3838—2002)中的Ⅳ类标准限值,调研的4个工地泥浆水全部超标;该城市地层土壤中的有机质、总氮、总磷含量高是泥浆水超标... 以某城市为例,研究城市建筑泥浆的污染现状,并分析泥浆受到污染的原因。结果表明:对照《地表水环境质量标准》(GB 3838—2002)中的Ⅳ类标准限值,调研的4个工地泥浆水全部超标;该城市地层土壤中的有机质、总氮、总磷含量高是泥浆水超标的重要原因,工地制浆使用的地表水和污水也不能满足Ⅳ类水质的要求。在建筑工地的管理中,应限制现场使用污水和超标的河水来调制泥浆,同时加强场地管理,防止雨水和污水进入泥浆池,以便建筑泥浆的后续处理。 展开更多
关键词 建筑泥浆 泥浆水 制浆用 地层土壤 污染调查
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一种凿井打钻废泥浆的处理方法——丁明,郭学峰,郑翔鲲,等.CN101774746A
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作者 王月卿 《工业水处理》 CAS CSCD 北大核心 2011年第7期21-21,共1页
本发明公开了一种凿井打钻废泥浆的处理方法。将井内返出的凿井打钻废泥浆经液屑分离除砂.在除砂后的凿井打钻废泥浆中加入无机絮凝剂和水稀释搅拌破稳.获得固体质量分数≤20%的泥浆水.随后在获得的泥浆水中加入聚丙烯酰胺絮凝剂搅... 本发明公开了一种凿井打钻废泥浆的处理方法。将井内返出的凿井打钻废泥浆经液屑分离除砂.在除砂后的凿井打钻废泥浆中加入无机絮凝剂和水稀释搅拌破稳.获得固体质量分数≤20%的泥浆水.随后在获得的泥浆水中加入聚丙烯酰胺絮凝剂搅拌,进行泥浆脱稳反应, 展开更多
关键词 泥浆 打钻 凿井 无机絮凝剂 固体质量分数 聚丙烯酰胺 泥浆水 稀释
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细鳞斜颌鲴受精卵的脱粘对比试验
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作者 江河 《科学养鱼》 北大核心 2008年第6期11-11,共1页
细鳞斜颌鲴受精卵呈弱粘性,卵粒小(产出时卵径0.8~1.2毫米)、比重大,孵化时易沉底而窒息死亡,加之传统的脱粘材料为黄泥浆水,脱粘后卵膜上附着有黄泥,更加大了卵的比重,往往导致孵化出苗率不高。为解决这一难题,我们于2007... 细鳞斜颌鲴受精卵呈弱粘性,卵粒小(产出时卵径0.8~1.2毫米)、比重大,孵化时易沉底而窒息死亡,加之传统的脱粘材料为黄泥浆水,脱粘后卵膜上附着有黄泥,更加大了卵的比重,往往导致孵化出苗率不高。为解决这一难题,我们于2007年选用新的脱粘材料与黄泥浆水进行脱粘对比试验,比较脱粘效果及对受精卵孵化出苗率的影响,现报道如下: 展开更多
关键词 脱粘效果 细鳞斜颌鲴 对比试验 受精卵 孵化出苗率 窒息死亡 泥浆水 比重
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喷施除草剂的药械如何清洗
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作者 陈泽 《农机具之友》 2003年第4期19-19,共1页
喷施除草剂的药械如何才能清洗干净呢?可根据喷施除草剂种类和特点的不同,采用不同的清洗方法。 一是用清水反复清洗。对喷施过麦田常用除草剂如巨星(苯黄隆),大豆和花生田除草剂如盖草能。
关键词 除草剂 喷施药械 清洗工作 泥浆水 硫酸亚铁溶液
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土池养虾之我见(中)
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作者 苏祥锦 《当代水产》 2014年第3期68-68,共1页
1.2.4泥浆水、浑浊水 因这两种水色造成排塘的很多,但也有不少人养得成功的。成功与否,得看你前期如何处理。
关键词 养虾 土池 泥浆水
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Hydration phase and pore structure evolution of hardened cement paste at elevated temperature 被引量:5
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作者 XIANG Yu XIE You-jun +1 位作者 LONG Guang-cheng HE Fu-qiang 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第6期1665-1678,共14页
To understand the effect of steam curing temperature on the hydrate and microstructure of hardened cement paste,several measuring methods including X-ray diffraction(XRD),atomic absorption spectroscopy(ASS),ion chroma... To understand the effect of steam curing temperature on the hydrate and microstructure of hardened cement paste,several measuring methods including X-ray diffraction(XRD),atomic absorption spectroscopy(ASS),ion chromatography,conductivity meter,alternating-current impedance spectroscopy and nuclear magnetic resonance(NMR)are employed to investigate the hydration characteristics,pore solution composition and conductivity,resistivity and pore structure during the steam curing process.Experimental results show that steam curing promotes the hydration process,greatly raises the resistivity,and decreases the porosity of specimen at early age.Compared with being treated at 45℃,higher temperature leads to a fast decomposition of ettringite at initial stage of the constant temperature treatment period,which improves the relative content and ionic activity of the conductive ions in pore solution.Furthermore,the number of pores larger than 200 nm increases significantly,which reduces the resistivity of the hardened cement paste.Cement paste treated at 45℃ has a more stable and denser microstructure with less damages. 展开更多
关键词 cement paste high-temperature curing pore structure AC impedance nuclear magnetic resonance
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Effect of graphene on mechanical properties of cement mortars 被引量:10
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作者 曹明莉 张会霞 张聪 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第4期919-925,共7页
Functionalized graphene nano-sheets(FGN) of 0.01%-0.05%(mass fraction) were added to produce FGN-cement composites in the form of mortars. Flow properties, mechanical properties and microstructure of the cementitious ... Functionalized graphene nano-sheets(FGN) of 0.01%-0.05%(mass fraction) were added to produce FGN-cement composites in the form of mortars. Flow properties, mechanical properties and microstructure of the cementitious material were then investigated. The results indicate that the addition of FGN decreases the fluidity slightly and improves mechanical properties of cement-based composites significantly. The highest strength is obtained with FGN content of 0.02% where the flexural strength and compressive strength at 28 days are 12.917 MPa and 52.42 MPa, respectively. Besides, scanning electron micrographs show that FGN can regulate formation of massive compact cross-linking structures and thermo gravimetric analysis indicates that FGN can accelerate the hydration reaction to increase the function of the composite effectively. 展开更多
关键词 functionalized graphene nano-sheets cement mortars mechanical strength microstmcture
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Coupled effect of viscosity enhancing admixtures and superplasticizers on rheological behavior of cement paste 被引量:5
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作者 元强 刘文涛 +3 位作者 王超 邓德华 刘赞群 龙广成 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第9期2172-2179,共8页
The coupled effect of viscosity enhancing admixtures(VEA)and superplasticizer(SP)on the rheological behavior of cement paste was investigated in this work.Two types of VEAs,including hydroxypropyl methylcellulose(HPMC... The coupled effect of viscosity enhancing admixtures(VEA)and superplasticizer(SP)on the rheological behavior of cement paste was investigated in this work.Two types of VEAs,including hydroxypropyl methylcellulose(HPMC)and Welan gum,and two types of SPs,i.e.polycarboxylate(PCA)and polynaphthalenesulfonate(PNS)were used as admixtures for cement paste.Rheological curves of cement paste and simulated pore solution containing VEA and SP were tested.Simulated pore solution test results show that molecules of different SPs may generate different effects on the viscosity of VEA solutions.Hershel-Bulkley(H-B)model was used to fit rheological curve of cement paste.Strong interaction between PNS and HPMC was observed in this work. 展开更多
关键词 rheology cement viscosity enhancing admixture SUPERPLASTICIZER
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Performance evaluation of nano-silica and silica fume on enhancing acid resistance of cement-based composites for underground structures 被引量:6
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作者 WU Lin-ping HUANG Guang-ping LIU Wei Victor 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第12期3821-3838,共18页
This study aims to evaluate the performance of silica fume(SF)and nano-silica(NS)on enhancing the sulfuric acid resistance of mortar mixtures.The NS and SF were added as substitutions for cement at various dosages.The... This study aims to evaluate the performance of silica fume(SF)and nano-silica(NS)on enhancing the sulfuric acid resistance of mortar mixtures.The NS and SF were added as substitutions for cement at various dosages.The cured samples were immersed in the sulfuric acid solution with a pH of 2 for 75 d.A compressive strength test and absorption and voids tests were conducted before sulfuric acid immersion.It was found that the addition of SF and NS reduced the volume of permeable voids and increased compressive strength.A thermo-gravimetric analysis was carried out to investigate the hydration of mixtures.The mixtures with SF showed a higher level of pozzolanic reaction compared with mixtures with NS.After the 75 d of immersion,the mixtures with 5%SF and 1%NS showed the best resistance against sulfuric acid because they showed the lowest mass change and length change. 展开更多
关键词 acid resistance NANO-SILICA silica fume MORTAR
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Size effect on cubic and prismatic compressive strength of cement paste 被引量:1
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作者 苏捷 叶缙垚 +1 位作者 方志 赵明华 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第10期4090-4096,共7页
A series of compression tests were conducted on 150 groups of cement paste specimens with side lengths ranging from 40 mm to 200 mm. The specimens include cube specimens and prism specimens with height to width ratio ... A series of compression tests were conducted on 150 groups of cement paste specimens with side lengths ranging from 40 mm to 200 mm. The specimens include cube specimens and prism specimens with height to width ratio of 2. The experiment results show that size effect exists in the cubic compressive strength and prismatic compressive strength of the cement paste, and larger specimens resist less in terms of strength than smaller ones. The cubic compressive strength and the prismatic compressive strength of the specimens with side length of 200 mm are respectively about 91% and 89% of the compressive strength of the specimens with the side length of 40 mm. Water to binder ratio has a significant influence on the size effect of the compressive strengths of the cement paste. With a decrease in the water to binder ratio, the size effect is significantly enhanced. When the water to binder ratio is 0.2, the size effects of the cubic compressive strength and the prismatic compressive strength of the cement paste are 1.6 and 1.4 times stronger than those of a water to binder ratio of 0.6. Furthermore, a series of formulas are proposed to calculate the size effect of the cubic compressive strength and the prismatic compressive strength of cement paste, and the results of the size effect predicted by the formulas are in good agreement with the experiment results. 展开更多
关键词 size effect cement paste water to binder ratio cubic compressive strength prismatic compressive strength
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Stability of long trench in soft soils by bentonite-water slurry 被引量:6
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作者 卓弘春 杨宇友 +2 位作者 张子新 潘春晖 段创峰 《Journal of Central South University》 SCIE EI CAS 2014年第9期3674-3681,共8页
A series of centrifuge model tests exploring the effects of different types of slurry on long-trench stability in soft clay were conducted. The influence of groundwater conditions relative to trench stability was exam... A series of centrifuge model tests exploring the effects of different types of slurry on long-trench stability in soft clay were conducted. The influence of groundwater conditions relative to trench stability was examined by constructing long trenches using different slurries. The soil deformation and surface settlement induced by the excavation of the trench are found to be closely related to slurry type and excavation depth of the long trench. Increasing the bentonite concentration of the slurry has beneficial effects on stability: 1) larger particles can improve local and global stability in cases where filter cakes do not form, and 2) larger viscosity can promote filter cake formation on the walls of long trenches excavated in soft clay and enhance their stability. 展开更多
关键词 slurry trench soft clay STABILITY centrifuge model test
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Pull-out tests and slope stability analyses of nailing systems comprising single and multi rebars with grouted cement 被引量:6
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作者 Sang-Soo Jeon 《Journal of Central South University》 SCIE EI CAS 2012年第1期262-272,共11页
The pull-out capacities for soil nailing systems comprising of one single 29 mm diameter(type A) and four 16 mm diameter(type B) rebars with grouted cement were examined.A field test and numerical analysis for the typ... The pull-out capacities for soil nailing systems comprising of one single 29 mm diameter(type A) and four 16 mm diameter(type B) rebars with grouted cement were examined.A field test and numerical analysis for the type A and type B systems were carried out to investigate the pull-out capacities and the slope stability reinforcement efficiency in soil and rock slopes.The results of the pull-out tests show the mobilized shear force and load transfer characteristics with respect to soil depth.The load-displacement relationship was examined for both type A and type B systems.Slope stability analyses were carried out to study the relationships between soil and nail reinforcement and bending stiffness as well as combined axial tension and shear forces.Factors of safety were calculated in relation to the number of nails and their outside diameters.Both soil and rock slopes were included in this evaluation. 展开更多
关键词 soil nailing bending resistance pull-out test finite difference method
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Geoelectric response of porous media in water and grout injection processes 被引量:3
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作者 孙强 刘盛东 +1 位作者 姜春露 王勃 《Journal of Central South University》 SCIE EI CAS 2014年第12期4640-4645,共6页
Significant changes in spontaneous potential and exciting currents are observed during water and grout injection in a simulated porous media. Obvious correlations between the seepage flow field and the electric field ... Significant changes in spontaneous potential and exciting currents are observed during water and grout injection in a simulated porous media. Obvious correlations between the seepage flow field and the electric field in the porous media are identified.In this work, a detailed experimental study of geoelectric field variation occurring in water migration was reported by analyzing water and grout injection processes in a simulated porous media. The spontaneous potential varies linearly with the thickness of unsaturated porous media. Very interestingly, the spontaneous potential generated in the second grout injection exhibits some"memory" of previous grouting paths. The decreases in spontaneous potential observed during grout injection is very probably due to that the spontaneous potential variations are primarily caused by electro-filtration potential, as indicated by the far larger viscosity of grout compared to that of water. The geoelectric response can be utilized to effectively identify the grouting paths in water-bearing rocks. 展开更多
关键词 sandstone water injection spontaneous potential electro-filtration potential
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