受断层构造影响的深部岩体现场调查及力学特征分析  

Field investigation and mechanics characteristics analysis of deep rock mass affected by fault structure

作　　者：余伟健[1,2] 高谦[3] 靳学奇[4] 张周平[4] 

机构地区：[1]湖南科技大学煤矿安全开采技术湖南省重点实验室,湘潭411201 [2]湖南科技大学能源与安全工程学院,湘潭411201 [3]北京科技大学土木与环境工程学院,北京100083 [4]金川集团公司,金昌737100

出　　处：《地球物理学进展》2013年第1期488-497,共10页Progress in Geophysics

基　　金：国家自然科学基金项目(51104063;51074071;51174086;51174088);湖南省教育厅资助项目(12cy013)

摘　　要：为了掌握断层构造带对周围岩体地质力学的影响程度及范围,以金川Ⅲ矿区+1165m水平巷道为工程背景,进行了现场调查、试验研究和理论分析等研究.首先,在了解工程概况的基础上,分别分析了主要构造、地层岩性和地应力分布规律.然后,采用详细线观测法进行结构面的现场调查,结果表明越靠近F2断层的岩体,受其影响程度越大,稳定性就越差;可将影响范围分为断层带(0～84m)、断层影响带(84～117m)、破碎带(117～146m)和节理带(146～180m)四个区域;采用数理统计方法分析不同影响区域的岩体节理密度和分布情况,表明整个影响范围之内岩体的完整系数Kv为0.5左右.最后,采用X衍射仪和扫描电镜对调查区域内的岩体进行矿物成分和微观损伤分析,表明从断层带至节理带,其岩体受构造影响程度逐渐减小,先是呈松散泥状岩体,然后由破碎状态过程到节理发育的岩体.巷道变形调查结果表明,岩体受断层影响程度越大,巷道的整体变形程度也越大,其支护形式也不一样.这些调查与研究结果对于深部巷道的掘进和大硐室开挖具有十分重要的参考价值.In order to grasp the geological mechanics influence degree and range of rock mass affected by fault zone, the 1165m level roadway in Jinehuan Mine III used as the engineering back in this, and the field investigation, the experimental study and the caleulation analysis were done. At first, distribution laws of major tectonic, stratum lithology and ground stress were analyzed based on engineering situation Then, the detail line observation method was applied to made field survey of structural plane, The result shows that these rock mass are more close to the F2 fault, their influence degree are greater, and their stability is worse. Here, range of influence can divided into the fault zone （0- 84m）, the influence zone of fault （ 84 - 117m）, the fracture zone （117- 146m） and the joint zone （146-180m）. The mathematical statistics method was used to analyze the density of joint rock mass and the distribution in different influence zone. It is indicated that the integrity coefficient of rock mass （Kv） in the influence zone is about 0. 5. At last, the X diffractometer and the scanning electron microscope were adopted to analyze the mineral composition and the microcosmic damage. The result shows that the influence degree is decreased gradually from the fault zone to the joint zone. And rock mass is from loose mud to crushing rock, until to joints developed rock. The field investigation of roadway deformation also proved that the influence degree of rock mass is greater, overall deformations of roadway are larger, and support forms are also different. These research results are the very important reference for the roadway excavation and the chamber excavation in deep underground engineering.

关 键 词：断层构造 深部岩体 地质力学 岩石力学 巷道变形 

分 类 号：P631[天文地球—地质矿产勘探] P642[天文地球—地质学]