深埋长隧洞三维地质力学模型试验研究  

EXPERIMENTAL STUDY ON 3D GEOMECHANICAL MODEL OF DEEP AND LONG TUNNEL

作　　者：李璐[1] 陈秀铜[2] 

机构地区：[1]西南石油大学土木工程与建筑学院,成都610500 [2]华能西藏发电有限公司,成都610000

出　　处：《工程地质学报》2017年第2期384-392,共9页Journal of Engineering Geology

摘　　要：为了评价深埋长隧洞围岩的稳定性和隧洞间距的合理性,本文采用三维地质力学模型试验技术,研究在高地应力、高外水压力作用下,隧洞围岩整体稳定性以及相邻洞室开挖的相互影响效应,并与三维弹塑性有限元数值计算结果进行对比验证,研究结果表明:地质力学模型试验成果和数值计算结果基本一致,两者得到的位移场、应力场、屈服区范围都基本吻合。在高地应力、高外水压力作用下,工程所在的Ⅲ类围岩隧洞是可以安全成洞的。采用超载法进行试验和计算可知,在Ⅲ类围岩中极限超载安全系数k>1.3,开挖隧洞对洞周围岩的位移与应力影响区一般小于1倍洞径范围,隧洞的间距是合适的。This paper evaluates surrounding rock stability and tunnel spacing of rationality of the long and deep tunnel.3D geomechanical model way is used to study the surrounding rock total stability and the effects mutually from adjacent tunnel excavation under high geostress and high groundwater pressure.3D geomechanical model results are compared with 3D Elastoplastic FEM calculated results. Research results show that the results of 3D geomechanical model experiment and 3D Elastoplastic FEM consideration are consistent. The displacement fields,stress fields and yield area range are consistent. Tunnel project with Ⅲ class of surrounding rock mass is safe under high geostress and high groundwater pressure. Limit overload safety factor is general more than 1. 3,experiment with overload under high geostress surrounding rock. The influence area of displacement and stress of excavation tunnel is generally less than one times the tunnel hole diameter range. The tunnel spacing is apposite.

关 键 词：三维地质力学模型试验 深埋长隧洞 三维弹塑性有限元 围岩 相似材料 

分 类 号：P642[天文地球—工程地质学]