赵固一矿基岩风化带阻隔水特征试验研究  

Experiment study on water resistance and isolation features of base rock weathering zone in Zhaogu No. 1 Mine

作　　者：许延春[1] 曹旭初 李江华[1] 李昆奇 刘中华[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《煤炭科学技术》2016年第1期178-182,195,共6页Coal Science and Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2013CB227903)

摘　　要：基于赵固一矿所采二1煤层上覆松散含水层富水性强的特点,为确定基岩风化带范围及其阻隔水性能,实现水体下安全采煤,进行了岩石试样的点荷载强度、干燥饱和吸水率和崩解试验,通过研究各试验指标随深度的变化规律,确定基岩风化带界限及风化作用后的阻隔水特征。试验结果表明：距离松散层底界面21.5 m为基岩风化带界限;0~10 m垂深范围内基岩风化带以泥类岩为主,干燥饱和吸水率在15%以上,且崩解迅速,具有良好的阻隔水性能,有利于裂隙弥合,抑制导水断裂带的发育;砂岩的干燥饱和吸水率较小,阻隔水性较差,且具有较强的耐崩解性,不利于导水裂缝的弥合。Based on a high watery of the loose aquifer in the overburden strata above the mining seam of No. 21 seam in Zhaogu No. 1Mine,in order to define the weathering zone scope and the water resistance and isolation features of the base rock and to realize a safety coal mining under the water body,a point loading strength test,dry saturated water absorption rate test and disintegration test of the rock samples were conducted. The study on the variation law of each test index with the depth varied was applied to define the limit of the base rock weathering zone and the water resistance and isolation features after the weathering role conducted. The test results showed that a distance of 21. 5 m to the bottom limit of the loose stratum was the limit of the base rock weathering zone. Within the 0 ~ 10 m scope,the weathering zone of the base rock was the mud type rock mainly,the dry saturated water absorption rate was over 15% and the disintegration was rapid. The weathering zone with excellent water resistance and isolation features could be favorable to the crack closed and to restrain the development of the water flow crack zone. The dry saturated water absorption rate of the sandstone was low and the water resistance and isolation was poor. With a high enduring disintegration,the sandstone would not be favorable to the water flow crack closed.

关 键 词：点荷载强度 干燥饱和吸水率 崩解试验 阻隔水特征 

分 类 号：TD167[矿业工程—矿山地质测量] P641.461[天文地球—地质矿产勘探]