摘要
港区内软土层深厚,地基条件复杂,堤身填筑高度大,给防波堤建设带来诸多隐患.为及时反映地基稳定状况、动态指导和控制施工进度,选取典型断面开展现场监测试验,对施工过程及工后的稳定性、变形、加固效果进行现场监测与检测.结果表明:地基沉降、深层水平位移在填筑期间发展较快,填筑至堤顶后逐渐趋于稳定.监测期内地基最大沉降量为760 mm,沉降速率在10 mm/d的安全标准范围,淤泥层压缩量占地基总沉降量的86%左右;地基最大深层水平位移在深度5~14 m范围的淤泥层内,水平位移速率小于5 mm/d.地基中总的孔压值在填筑期间上升,加载结束后孔压值开始缓慢消散,呈现出良好的规律性.防波堤建设后,淤泥地基的土性指标得到了不同程度的改善,地基强度得到明显提高.
The soft soil layer in the port area is deep,the foundation conditions are complex,and the embankment has a high filling height,which brings many hidden dangers to the construction of the breakwater.In order to reflect the stability status of the foundation in time,dynamically guide and control the construction progress,select typical cross-sections for on-site monitoring,conduct on-site monitoring and detection of the stability and deformation of the construction process and post-construction effects.The results show that the surface settlement and deep horizontal displacement develop rapidly during the filling period,and gradually stabilize after filling to the top of the embankment.During the monitoring period,the maximum settlement of the foundation is 760 mm,and the settlement rate is within the safety standard range of 10 mm/d.The compression of the silt layer accounts for about 86%of the total settlement of the foundation;the maximum horizontal displacement of the foundation is in the silt layer with a depth of 5-14 m,and the horizontal displacement rate is less than 5 mm/d.The total pore pressure value in the foundation increased during the filling period,after the loading,the pore pressure value began to dissipate slowly,which shows good regularity.After the breakwater was constructed,the soil properties of the silt foundation were improved to varying degrees,and the strength of the foundation was significantly improved.
作者
许小龙
占鑫杰
杨守华
朱群峰
周彦章
黄宙晟
XU Xiaolong;ZHAN Xinjie;YANG Shouhua;ZHU Qunfeng;ZHOU Yanzhang;HUANG Zhoucheng(Geotechnical Engineering Research Institute,Nanjing Hydraulic Research Institute,Nanjing 210029,China)
出处
《河南科学》
2020年第1期89-95,共7页
Henan Science
基金
国家重点研发计划(2018YFC1508504)
南京水利科学研究院中央级公益性科研院所基本科研业务费重点项目(Y317007,Y318015)
江苏省研究生科研与实践创新计划项目(KYCX19_2320)。
关键词
防波堤
监测
变形
水平位移
加固效果
breakwater embankment
monitoring
deformation
horizontal displacement
reinforcement effect
作者简介
许小龙(1995-),男,硕士研究生,主要从事地基处理、基础工程研究;通信作者:杨守华(1962-),男,教授级高级工程师,主要从事地基处理、基础工程和环境岩土工程研究工作。
