Comparing with the resin bolt, the hydraulic expansion bolt has different anchoring mechanism and application advantage. According to the working mechanism of the hydraulic expansion bolt, its anchoring force is expre...Comparing with the resin bolt, the hydraulic expansion bolt has different anchoring mechanism and application advantage. According to the working mechanism of the hydraulic expansion bolt, its anchoring force is expressed in four forms including support anchoring force, tension anchoring force, expansion anchoring force and tangent anchoring force, and their values can be obtained on the basis of each calculation formula. Among them, the expansion anchoring force, which is the unique anchoring force of the hydraulic expansion bolt, can provide confining pressure to increase the strength of rock. Aiming at solving the problem of stability control in the soft rock roadway in Jinbaotun Coal Mine which has a double layer of 40 U-type sheds and cannot provide enough resistance support to control floor heave, the study reveals the mechanism of floor heave in the soft rock roadway, and designs the reasonable support parameters of the hydraulic expansion bolts. The observed results of floor convergence indicate that the hydraulic expansion bolts can prevent the development and flow of the plastic zone in the floor rock to control floor heave. Research results enrich the control technology in the soft rock roadway.展开更多
In order to control asymmetric floor heave in deep rock roadways and deformation around the surrounding rock mass after excavation, in this paper we discuss the failure mechanism and coupling control countermeasures u...In order to control asymmetric floor heave in deep rock roadways and deformation around the surrounding rock mass after excavation, in this paper we discuss the failure mechanism and coupling control countermeasures using the finite difference method （FLAC^3D） combined with comparative analysis and typical engineering application at Xingcun coal mine, It is indicated by the analysis that the simple symmetric support systems used in the past led to destruction of the deep rock roadway from the key zone and resulted in the deformation of asymmetric floor heave in the roadway. Suitable rein- forced support countermeasures are proposed to reduce the deformation of the floor heave and the potential risk during mining. The application shows that the present support technology can he used to better environmental conditions. The countermeasures of asymmetric coupling support can not only effectively reduce the discrepancy deformation at the key area of the surrounding rock mass, hut also effectively control floor heave, which helps realize the integration of support and maintain the stability of the deep rock roadways at Xingcun coal mine.展开更多
Floor heave of a roadway is a dynamic phenomenon that often happens in the roadways of coal mines. It seriously affects safe production in the coal mine. Floor heave has long been one of the most difficult problems to...Floor heave of a roadway is a dynamic phenomenon that often happens in the roadways of coal mines. It seriously affects safe production in the coal mine. Floor heave has long been one of the most difficult problems to be resolved during coal mining. An analysis of floor heave in the soft rock surrounding the roadway, and the factors influencing it, allowed the deformation mechanism in the west wing double track haulage roadway of the Tingnan Coal Mine to be deduced. Three types of floor heave are observed there: intumescent floor heave, extrusion and mobility floor heave, and compound floor heave. Control measures are proposed that have been adopted during a recent repair engineering project. Control of the floor heave in the west wing track haulage roadway was demonstrated. The reliability and rationality of a combined support technology including floor anchors, an inverted arch, and anchoring of both sides was verified by mine pressure data and the field observations. Waterproofing measures were also under-taken to assist in the control of floor heave.展开更多
随着矿井水防治在煤矿开采中的重要性与日俱增,对地震精细勘探的方法也提出了更高要求,常规基于各向同性的地震勘探已无法满足对复杂条件下煤层及其顶底板的高精度勘探要求。根据煤系地层正交各向异性特征,综合其周期性薄互层各向异性...随着矿井水防治在煤矿开采中的重要性与日俱增,对地震精细勘探的方法也提出了更高要求,常规基于各向同性的地震勘探已无法满足对复杂条件下煤层及其顶底板的高精度勘探要求。根据煤系地层正交各向异性特征,综合其周期性薄互层各向异性和裂隙诱导型各向异性,针对具有垂直对称轴的横向各向同性(Transverse Isotropy Medium with Vertical Symmetry Axis,VTI)介质特性提出基于高阶动校正的广角成像方法拉平同相轴,提高远、近偏移动校正精度,针对方位各向异性(Trans-verse Isotropy with Horizontal Axis of Symmetry,HTI)介质特性应用炮检距向量片(Offset Vector Tile,OVT)域处理消除煤系地层构造裂隙下不同方位各向异性,在地震资料处理阶段提高成像精度及分辨率。在宽方位高保真成像基础上,岩性解释基于岩石物理特征的拟声波方法,通过对声波时差测井曲线进行重构,在速度曲线中融入地层岩性信息,通过反演迭代可分析地层岩性空间展布特征;裂隙解释基于OVT道集所包含的方位角偏移距信息椭圆拟合,得到地震波在不同方位衰减梯度,由方位衰减梯度数据拟合得到裂缝密度及方位推出地层裂缝密度分布特征,实现对影响矿井水灾两大关键参数煤层顶板含水层以及导水裂隙带的精细探查。在此基础上对煤层顶板产水危险区进行综合评估。将所提方法应用于研究区,实际资料含水风险评价与生产井情况吻合度较好,结果验证了所提出的风险评价方法的可行性及适用性,为煤层开采中矿井水灾危险区预测提供了有益参考。展开更多
基金support by the National Natural Science Foundation of China (No.51174195)the Fundamental Research Funds for the Central Universities of China (No.2010QNA31)
文摘Comparing with the resin bolt, the hydraulic expansion bolt has different anchoring mechanism and application advantage. According to the working mechanism of the hydraulic expansion bolt, its anchoring force is expressed in four forms including support anchoring force, tension anchoring force, expansion anchoring force and tangent anchoring force, and their values can be obtained on the basis of each calculation formula. Among them, the expansion anchoring force, which is the unique anchoring force of the hydraulic expansion bolt, can provide confining pressure to increase the strength of rock. Aiming at solving the problem of stability control in the soft rock roadway in Jinbaotun Coal Mine which has a double layer of 40 U-type sheds and cannot provide enough resistance support to control floor heave, the study reveals the mechanism of floor heave in the soft rock roadway, and designs the reasonable support parameters of the hydraulic expansion bolts. The observed results of floor convergence indicate that the hydraulic expansion bolts can prevent the development and flow of the plastic zone in the floor rock to control floor heave. Research results enrich the control technology in the soft rock roadway.
基金support from the National Natural Science Foundation of China (Nos. 51134005, 51374214, 41172116, and U1261212)the New Century Excellent Talents Foundation in University (No. NCET-07-0800)the Special Fund of Basic Research and Operating of China University of Mining & Technology in Beijing (No. 2009QL03)
文摘In order to control asymmetric floor heave in deep rock roadways and deformation around the surrounding rock mass after excavation, in this paper we discuss the failure mechanism and coupling control countermeasures using the finite difference method （FLAC^3D） combined with comparative analysis and typical engineering application at Xingcun coal mine, It is indicated by the analysis that the simple symmetric support systems used in the past led to destruction of the deep rock roadway from the key zone and resulted in the deformation of asymmetric floor heave in the roadway. Suitable rein- forced support countermeasures are proposed to reduce the deformation of the floor heave and the potential risk during mining. The application shows that the present support technology can he used to better environmental conditions. The countermeasures of asymmetric coupling support can not only effectively reduce the discrepancy deformation at the key area of the surrounding rock mass, hut also effectively control floor heave, which helps realize the integration of support and maintain the stability of the deep rock roadways at Xingcun coal mine.
基金grateful to the Key Program of the National Natural Science Foundation of China (Nos. 51134005, 40972196, and 41172263) for financing this research
文摘Floor heave of a roadway is a dynamic phenomenon that often happens in the roadways of coal mines. It seriously affects safe production in the coal mine. Floor heave has long been one of the most difficult problems to be resolved during coal mining. An analysis of floor heave in the soft rock surrounding the roadway, and the factors influencing it, allowed the deformation mechanism in the west wing double track haulage roadway of the Tingnan Coal Mine to be deduced. Three types of floor heave are observed there: intumescent floor heave, extrusion and mobility floor heave, and compound floor heave. Control measures are proposed that have been adopted during a recent repair engineering project. Control of the floor heave in the west wing track haulage roadway was demonstrated. The reliability and rationality of a combined support technology including floor anchors, an inverted arch, and anchoring of both sides was verified by mine pressure data and the field observations. Waterproofing measures were also under-taken to assist in the control of floor heave.
文摘随着矿井水防治在煤矿开采中的重要性与日俱增,对地震精细勘探的方法也提出了更高要求,常规基于各向同性的地震勘探已无法满足对复杂条件下煤层及其顶底板的高精度勘探要求。根据煤系地层正交各向异性特征,综合其周期性薄互层各向异性和裂隙诱导型各向异性,针对具有垂直对称轴的横向各向同性(Transverse Isotropy Medium with Vertical Symmetry Axis,VTI)介质特性提出基于高阶动校正的广角成像方法拉平同相轴,提高远、近偏移动校正精度,针对方位各向异性(Trans-verse Isotropy with Horizontal Axis of Symmetry,HTI)介质特性应用炮检距向量片(Offset Vector Tile,OVT)域处理消除煤系地层构造裂隙下不同方位各向异性,在地震资料处理阶段提高成像精度及分辨率。在宽方位高保真成像基础上,岩性解释基于岩石物理特征的拟声波方法,通过对声波时差测井曲线进行重构,在速度曲线中融入地层岩性信息,通过反演迭代可分析地层岩性空间展布特征;裂隙解释基于OVT道集所包含的方位角偏移距信息椭圆拟合,得到地震波在不同方位衰减梯度,由方位衰减梯度数据拟合得到裂缝密度及方位推出地层裂缝密度分布特征,实现对影响矿井水灾两大关键参数煤层顶板含水层以及导水裂隙带的精细探查。在此基础上对煤层顶板产水危险区进行综合评估。将所提方法应用于研究区,实际资料含水风险评价与生产井情况吻合度较好,结果验证了所提出的风险评价方法的可行性及适用性,为煤层开采中矿井水灾危险区预测提供了有益参考。
