地下水渗流对巷道围岩稳定性影响的理论解_荣传新.pdf

第23 卷 第5 期 岩石力学与工程学报 23(5) ：741～744 2004 年3 月 Chinese Journal of Rock Mechanics and Engineering March ，2004 地下水渗流对巷道围岩稳定性影响的理论解 荣传新1，2 程 桦 1 (1 安徽理工大学土木工程系 淮南 232001) (2 中国科学技术大学力学与机械工程系 合肥 230027) 摘要 将巷道围岩视为多孔介质，考虑地下水渗流作用的影响，应用弹塑性损伤力学理论，导出了巷道围岩的应 力分布规律以及巷道损伤区半径与孔隙水压力之间的关系；并根据极值点失稳理论，提出了巷道围岩稳定条件， 给出了渗流作用下巷道围岩稳定的孔隙水压力的临界值。当巷道围岩中的孔隙水压力接近临界值时，巷道围岩处 于非稳定平衡态，此时如受到轻微的扰动，巷道围岩将因失稳而坍塌，从而发生突水事故。 关键词 地下水，渗透作用，巷道围岩，稳定性 + 分类号 TD 325 .1，O 357.3 文献标识码 A 文章编号 1000-6915(2004)05-0741-04 STABILITY ANALYSIS OF ROCKS AROUND TUNNEL WITH GROUND WATER PERMEATION 1，2 1 Rong Chuanxin ，Cheng Hua (1 Department of Civil Engineering ，Anhui University of Science and Technology ， Huainan 232001 China) (2 Department of Modern Mechanics ，University of Science and Technology of China， Hefei 230027 China) Abstract As porous medium，rocks are affectd by ground water permeation. Elasto-plastic theory and damage mechanics are used to obtain the stress distribution of rocks around tunnel and the relation of porous hydraulic pressure P0 and plastic radius r. According to the theory of limit point of stability，the stable condition for rocks around tunnel is put forward，and the values of critical porous hydraulic pressure of rocks around tunnel are acquired by taking the ground water permeation effect into account. When the porous hydraulic pressure value of rocks around tunnel is close to the critical value，the rocks around tunnel are in the state of instability. If dynamic disturbance is present under this condition，the rocks around tunnel will collapse due to instabil