渗透压力和孔隙度对隧道围岩变形的影响研究  

Research on the Influence of Seepage Pressure and Porosity on Tunnel Surrounding Rock Deformation

作　　者：师雯琦 杨双锁[1] 牛少卿[1] 李晓强 陈浩[1] 梁辉 陈海波 SHI Wenqi;YANG Shuangsuo;NIU Shaoqing;LI Xiaoqiang;CHEN Hao;LIANG Hui;CHEN Haibo(College of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024

出　　处：《矿业研究与开发》2021年第3期91-97,共7页Mining Research and Development

基　　金：国家自然科学基金资助项目(U1710111);山西省重点研发计划重点项目(201703D111027).

摘　　要：针对碎石粉质黏土与块状岩石含水层中的渗流现象,运用数值分析方法,先在限定岩体孔隙度的前提下施加不同的渗流压力,进行围岩受力与变形分析;次在限定岩体所受渗流压力的条件下改变其孔隙度的初始赋值,探究孔隙度对于隧道围岩变形的影响;随后建立双因素变量共同作用下的隧道围岩模型,孔隙度取0.05~0.5区间内的10组数据,渗透压力值取2.0MPa~2.2 MPa区间内的3组数据,对双变量赋值交叉组合后进行分析研究。结果表明:随着渗流压力的增加,主要表现为孔隙水压力的增加和围岩位移的激增,其中,尤属破碎围岩区域的岩体变形最为显著。在对围岩的竖向位移进行分析时,上述两个变量中孔隙度为主要影响因素,而在对围岩沿其他方向的位移进行分析时,主要因素则应根据具体情况而定。Aiming at the seepage phenomenon that occurs in the main aquiers of crushed silty clay and massive rocks,numerical analysis method was used to analyze the forces and deformations of surrounding rocks by applying different seepage pressures on the premise of limiting the porosity of rock mass.Under the condition of limiting the seepage pressure of rock mass and changing the initial value of porosity,the influence of porosity on the deformation of tunnel surrounding rock was explored.Subsequently,a tunnel surrounding rock model under the combined action of two-factor variables was established.The porosity taking ten sets of data in the interval of 0.05~0.5,and the seepage pressure value selecting three sets of data in the interval of 2.0~2.2 MPa,analysis and research was carried out on the two-factor variables after cross combination.The results show that with the increase of seepage pressure,it is mainly manifested by the increase of pore water pressure and the sharp increase of surrounding rock displacement.Among them,the rock mass deformation is the most significant in the area of broken surrounding rock.In the analysis of the vertical displacement of surrounding rock,the porosity is the main influencing factor,while in the analysis on the displacement of surrounding rock along other directions,the main factor should be determined according to the specific situation.

关 键 词：碎石粉质黏土 渗流压力 孔隙水压力 孔隙度 围岩变形 

分 类 号：TD313[矿业工程—矿井建设]