水平层状岩地区隧道围岩荷载计算方法  

Calculation Method for Rock Load of Tunnels in the Horizontal Stratified Rock Area

作　　者：王安东[1] WANG Andong(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《高速铁路技术》2023年第1期32-37,共6页High Speed Railway Technology

摘　　要：为研究适用于水平层状围岩隧道围岩压力计算方法,对现有层状围岩破坏准则进行了调研与总结,采用ANSYS接触单元模拟层状泥岩层理面,借助UDEC建立数值计算模型,推导层状岩层厚与普氏坚固系数之间的关系式。研究结果表明:(1)水平层状围岩出现斜交层理面的剪切破坏,剪切破坏面与最大主应力夹角45°,提出了水平层状岩修正后的黏聚力和内摩擦角计算公式;(2)回归分析得到考虑层厚的修正普氏坚固系数,进而修正了围岩压力侧压力系数,总结归纳出了水平岩层隧道深、浅埋条件下的围岩荷载计算方法。In order to study the calculation method for rock pressure of tunnels in the horizontal stratified rock,the failure criterion of existing stratified rock was investigated and summarized.The bedding plane of stratified mudstone was simulated by using ANSYS contact units,the numerical calculation model was established with UDEC,and the relationship between stratified rock thickness and Proctor firmness coefficient was derived.The results show that:(1)The shear failure of the skew bedding plane occurs in the horizontal stratified rock,and the included angle between the shear failure plane and the maximum principal stress is 45°.On this basis,the calculation formula of cohesion and internal friction angle of horizontal stratified rock after correction was proposed.(2)Based on the results of regression analysis,the modified M.M.Protodyakonov’s coefficient considering the layer thickness was obtained,and then used to correct the lateral pressure coefficient of rock pressure.Finally,a method for calculating the rock load of a deep and shallow tunnel in horizontal rock strata was derived.

关 键 词：水平层状岩 普氏坚固系数 修正系数 围岩荷载 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]