干河矿2#煤层旺采区围岩的物理力学特性测试

Mechanical and physical properties test of surrounding rock for Wongawilli area of 2# coalbed in Ganhe Colliery

为了满足干河煤矿旺采试验区采场煤巷布置和支护设计需求,并对地下水防治提出相关技术措施,利用现场取样、电镜扫描(SEM)、X射线衍射(XRD)、力学试验等方法,对采场围岩矿物成分和力学参数进行了相关测试。根据钻孔取芯统计结果,顶底板平均岩石质量指标低于30%,围岩完整性差。XRD分析表明,砂质泥岩含黏土矿物总量约19%,黏土矿物主要成分为I/S混层和高岭土,相对含量达85%以上。SEM试验发现,围岩含溶蚀孔、层片状特征及大量的黏土矿物分布,需要加强地下水防治。力学测试结果表明,顶板砂质泥岩抗压强度离散性较大,顶板岩性不均,需要根据围岩性质及时调整锚杆支护设计。

The arrangement and support design of roadways are all based on the properties of the surrounding rocks, the component of rocks is also important to preventive measures of the underground water.The study was conducted on Wongawilli area in Ganhe Colliery to solve those problems, and mineral composi tion and mechanical properties were tested by site sample, SEM（scanning electron microscope）, XRD（X- ray diffraction） and some other mechanical equipments. The core drilling results show that the RQD（rock quality designation） is lower than 30% and the integrality of surrounding rock is poor. The content of clay minerals in roof rock is about 19% by XRD. The main composition of clay minerals are I/S mixed-layer and Kaolin and their relative amount is greater than 85 %. There are many dissolved pores, lamellar structures and clay minerals in surrounding rock by SEM test, so more preventive measures should be carried out for underground water. The compressive strength test results of roof sandy mudstone is of great discreteness, and the characters of roof rock is uneven, so support design should be adjusted in time according to the conditions of the surrounding rock.