导硐法施工中导硐位置及尺寸的优化研究  

Research on Optimization of Location and Size of Drift in Pilot Construction Method

作　　者：倪振强[1,2] 孔纪名[1,2] 阿发友 

机构地区：[1]中国科学院水利部成都山地灾害与环境研究所山地灾害与地表过程重点实验室,成都610041 [2]中国科学院研究生院,北京100101

出　　处：《地下空间与工程学报》2012年第2期363-369,共7页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金重点项目(50639070)

摘　　要：随着硐室埋深加大、围岩破碎、裂隙发育等因素的出现,岩石呈现明显的软岩特性,并由此产生了大变形、大地压、难支护等一系列工程问题。近几年逐渐采用导硐施工技术来解决这些问题,根据导硐施工法的原则:让硐室掘出后在原岩应力作用下充分产生流动变形、塑性变形,释放部分地应力,并利用围岩自身的承载能力,使地应力重新分布达到新的应力平衡状态,使地压力得到有效释放与控制。在导硐法施工中,如何优化导硐位置及尺寸是导硐施工技术的关键问题;建立不同导硐模型,通过Flac3D进行数值模拟,分析、比较导硐后硐室的塑性变形、位移和应力情况,得到一个最佳的导硐模型。With the emergence of some factors in tunnel construction such as increased buried depth,crushing of surrounding rock,developed fracture,etc.,the rock showed obvious soft rock characteristics and caused a series of engineering problems such as its large deformation,large earth pressure and difficulty in supporting.In recent years,to solve these problems the pilot tunnel construction technology was gradually adopted.According to the principle of pilot construction as making the tunnel to generate sufficient flow deformation and plastic deformation,to release a part of the ground stress under the action of the original rock stress after the tunnel was dug out,by utilizing rock＇s own bearing capacity,and then redistributing the ground stress to reach a new stress equilibrium state,to release and control the ground stress effectively.In pilot construction method,how to determine drifts＇ location and size reasonably was the key technology point.Establishing different drift models,through the numerical simulation of Flac3D to analyze and compare plastic deformation,displacement and stress conditions of chambers after pilot construction and the best chamber model has been gained.

关 键 词：导硐法 硐室 软岩 围岩 数值模拟 

分 类 号：TD823[矿业工程—煤矿开采]