高埋深岩体片理角度对开挖洞室稳定性影响  

Effect of Different Rock Schistose Angles to the Stability of Tunnel's Excavation Under High Buried Depth

作　　者：郭金龙[1] 王瑞红[1] 汤天彩[1] 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002

出　　处：《人民黄河》2015年第6期109-112,共4页Yellow River

基　　金：国家自然科学基金资助项目(51479102);三峡大学土木与建筑学院2014年培优基金资助项目(PY201415)

摘　　要：基于卸荷理论，采用岩土差分软件FLAC分析高埋深作用下不同片理角度岩体对开挖洞室变形的影响。不同片理角度下隧洞模型水平向、竖直向位移以及塑性区对比可以看出，卸荷作用下片理角度对隧洞稳定性影响较大。随着岩石片理角度的增大，隧洞水平方向位移逐渐增大，隧洞周围关键点竖直向位移先增大后减小，当岩石片理角度为40°~60°时，竖直向位移量最小；隧洞周围的岩体塑性区在洞轴两侧大致呈X形分布，塑性区方向、大小及位置与片理角度关系密切；当岩体承受同样的荷载作用时，岩体节理方向与隧洞夹角的变化使得隧洞周围的变形差异较大，在实际工程中应注意岩石片理特性对工程开挖的影响。Based on unloading theory., it used tile engineering difference software FLAC to simulate tunnel excavation under different schis- tose angles and analyze tile impact of the deformation at high depth. Under different schistose angles, by contrast the x displacement, y dis- placement and plastic zone, the angle have a great influence on the stability of the tunnel under the effect of unloading. With the increase of rock schistositv angle, the x displacement of model increased gradually, the y displacement increased first and then decreased, and the y dis- placement had the minimum displacement of rock tunnel when the rock schistosity angle of 40° to 60°. Plastic zone around the hob＇ axis tm both sides was roughly X distribution. The plastic zone size and direction had a close relationship to the placement and schistnsity angle. When the rock load at the same direction, the different rock schistosity angles make a big difference to the deformation of the tunnel, so we should pay attention t~/the influence of the characteristics of rock schistosity to the excavation in practical engineering.

关 键 词：卸荷理论 片理角度 隧洞开挖 塑性区 稳定性 

分 类 号：TV223.3[水利工程—水工结构工程]