金川Ⅲ矿区硐室围岩蠕变特性与支护时机  

Creep features of surrounding rock and supporting time for the chamber in Jinchuan Mine No.3

作　　者：李欣[1] 高谦[1] 刘增辉[1,2] 杨长祥[3] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]安徽理工大学能源与安全学院,淮南232001 [3]金川集团公司三矿区,金昌737100

出　　处：《北京科技大学学报》2011年第10期1182-1189,共8页Journal of University of Science and Technology Beijing

基　　金：国家重点基础研究发展计划资助项目(2010CB731501);"十一五"国家科技支撑计划资助项目(2008BAB32B01);国家自然科学基金面上资助项目(51074003)

摘　　要：针对金川Ⅲ矿区硐室围岩蠕变控制问题,通过对破碎工程系统中大件道工程围岩变形的监测发现有明显的流变特性,即包括急剧变形、减速变形以及变形趋于稳定的三个阶段.分析了围岩应力环境、矿物成分和地下水对硐室围岩变形的影响,提出了适合高地应力构造影响带围岩流变模型,并对流变参数作了分析.根据金川岩体流变过程是由弹性、塑性、黏弹性和黏塑性等多种变形共存的一个复杂过程,呈现出高度的非线性的特征,从理论上分析二次支护的最佳时机,即金川Ⅲ矿区深部岩体在开挖并进行一次支护后的第3周内可作为最佳的二次支护时机,允许变形量应控制在50～150 mm.In order to solve the creep control problem of surrounding rock for the crushing chamber in Jinchuan Mine No.3,the deformation of channel surrounding rock in the crushing engineering system was monitored and it showed obviously rheological properties which include rapid deformation,slow deformation and deformation stabilization.By analyzing the effect of the stress environment of surrounding rock,mineral composition and ground water on the deformation of surrounding rock,a suitable high-stress and tectonic belt rheological model was proposed and its rheological parameters were analyzed.The rheological process of Jinchuan rock is a complex process in which elastic,plastic,visco-elastic and visco-plastic deformations coexists,with a highly nonlinear characteristic.The optimum time of the second support was analyzed in theory.The second support as the best opportunity ought to be carried out within the third week after deep rock excavation and the first support in the Jinchuan Mine No.3,and the allowable deformation should be controlled between 5 mm and 150 mm.

关 键 词：采矿 地下工程 支护 围岩 蠕变 变形监测 

分 类 号：TD322.4[矿业工程—矿井建设]