爆破荷载对含软弱夹层隧道围岩稳定性和变形破坏特征的影响  

Influence of Blasting Load on Stability and Deformation Failure Characteristics of Tunnel Surrounding Rock Mass with Weak Interlayer

作　　者：徐叶勤 李梅[1] 姚俊伟 梅万全 熊永亮 XU Ye-qin;LI Mei;YAO Jun-wei;MEI Wan-quan;XIONG Yong-liang(Wuhan University of Technology,Wuhan 430070,China;Henan Building Materials Research and Design Institute Co.,Ltd.,Zhengzhou 450000,China)

机构地区：[1]武汉理工大学,武汉430070 [2]河南建筑材料研究设计院有限责任公司,郑州450000

出　　处：《爆破》2020年第2期35-41,共7页Blasting

基　　金：国家自然科学基金(51104111)。

摘　　要：为研究爆破荷载对含软弱夹层隧道围岩稳定性的影响,采用中科院武汉岩土所自主研发的CASRock软件系列模块,即弹塑性细胞自动机EPCA3D动力模块,分析了爆破荷载作用下不同方向中间主应力(水平方向、隧道轴向)、软弱夹层与隧道距离(2 r、1r、0.5r、0.25r)和软弱夹层倾角(0°~90°)对隧道围岩稳定性的影响。以等效塑性应变为破坏特征量分析围岩的损伤程度,发现当中间主应力沿隧道轴向时对围岩稳定性基本无影响;当中间主应力沿水平方向时隧道围岩稳定性随着中间主应力的增大逐渐增强;软弱夹层越靠近隧道边界产生的影响越大;软弱夹层倾角对隧道围岩的影响程度随角度增长先增大后减小,在60°至75°范围内影响程度达到最大。In order to study the effect of blasting load on the stability of tunnel surrounding rock with weak interlayers,using the CASRock software series module independently developed by Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,namely the elasto-plastic cellular automaton EPCA3D dynamic module,the influence of different directions of intermediate principal stress(horizontal direction,tunnel axial direction),distance between weak interlayer with tunnel(2 r,1r,0.5r,0.25r)and inclination angle of weak interlayer(0°~90°)on the stability of the tunnel surrounding rock under blasting load were analyzed.The damage degree of surrounding rock was analyzed with equivalent plastic strain as the failure characteristic quantity,and it was found that when the intermediate principal stress was along the axial direction of the tunnel,it had little influence on the stability of surrounding rock.When the middle principal stress is horizontal,the stability of surrounding rock is enhanced with the increase of the middle principal stress.The closer the weak interlayer is to the tunnel boundary,the greater the influence will be.The influence degree of the weak interlayer dip angle on the tunnel surrounding rock stability increases first and then decreases with the increase of the angle,and the influence degree reaches the maximum within the range of 60°to 75°.

关 键 词：爆破荷载 软弱夹层 EPCA3D 中间主应力 等效塑性应变 

分 类 号：TD235[矿业工程—矿井建设]