摘要
为了考虑岩石岩性的影响,对两淮矿区某正在掘进巷道进行钻孔取样,根据柱状图取巷道两相邻水平标高(-850.0 m和-861.8 m,以下称为Ⅰ和Ⅱ水平)作为实验取芯点,其岩性分别为中粗砂岩和砂质泥岩。利用声发射测试仪测得不同水平标高地应力,经理论计算获得相应的主应力,采用ANSYS和FLAC3D在非轴对称应力场(分Ⅰ和Ⅱ水平2种应力加载方法)下进行模拟,并与现场实测结果对比。研究结果表明:Ⅰ和Ⅱ水平的地应力无明显的叠加性。实测巷道不同水平的围岩稳定性(主要指围岩位移分布)与对应水平的应力加载条件下的模拟结果相似;考虑岩石岩性对巷道地应力赋存情况的影响的必要性,同时为该埋藏条件下巷道支护设计提供更加可靠的地应力数据。
In order to consider the influence of rock lithology, bore-hole sampling was gotten in the excavation roadway of Huainan and Huaibei mining area, and two adjacent level elevations of tunnel（-850.0 m and-861.8 m, and referred to as Ⅰ, Ⅱ level in the following） were taken as the core site according to the histogram. Rock lithologies were medium coarse sandstone and sandy mudstone, respectively. Acoustic emission testing instrument was used to measure the in-situ stress of different levels of elevation, and then the corresponding main stress through theoretical calculation was obtained. ANSYS and FLAC3 D were used to simulate in the non axisymmetric stress field and the field measured results were compared. The results show that the in-situ stresses of Ⅰ, Ⅱ level have no obvious superposition. And the field measurement stability of surrounding rock in different level roadway（mainly refers to the distribution of surrounding rock displacement） is similar to the simulation results under the corresponding horizontal stress loading conditions. It is very necessary to accord the rock lithology on the influence of in-situ stress occurrence conditions of roadway, and more reliable in-situ stress data were provided for roadway support design under the same condition.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第9期3377-3384,共8页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51374013)~~
关键词
岩石岩性
地应力测试
声发射凯赛尔效应
钻孔柱状图
数值模拟
现场实测
rock lithology
in-situ stress test
acoustic emission Kaiser effect
drilling histogram
numerical simulation
field measurement
