构造节理对隧道岩爆模式的影响研究  

Study on the Effect of Structural Joints on Tunnel Rockburst Mode

作　　者：曲宏略[1,2,3] 吴昆铭 陈爽 汪林 黄伟 Qu Honglue;Wu Kunming;Chen Shuang;Wang Lin;Huang Wei(School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,P.R.China;Natural Gas Geology Key Laboratory of Sichuan Province,Chengdu 610500,P.R.China;Nuobikan-Southwest Jiaotong University Joint Laboratory of Industry,University and Research,Chengdu 610500,P.R.China;Yunnan Infrsastructure Investment Co.,Ltd.,Kunming 650000,P.R.China)

机构地区：[1]西南石油大学地球科学与技术学院,成都610500 [2]天然气地质四川省重点实验室,成都610500 [3]诺比侃西南交大产学研联合实验室,成都610500 [4]云南建设基础设施投资股份有限公司,昆明650000

出　　处：《地下空间与工程学报》2023年第5期1584-1592,共9页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51809221);深部岩土力学与地下工程国家重点实验室开放基金(SKLGDUEK1910);蔓耗至金平高速公路项目(JTSZ-MJGS-2019-042)。

摘　　要：在构造应力的作用下,岩体内部节理普遍发育,而节理对深埋隧道岩爆的发生具有重要的影响。为研究节理分布与岩爆破坏的关系,本文以草果山隧道为依托,基于现场岩爆与构造节理的分布规律,通过声发射数据分析裂隙分布特征及演化过程,并采用岩石破裂过程分析软件(RFPA)进行研究。结果表明:节理的走向与隧道轴线平行较垂直更易引发岩爆;隐于围岩内部且靠近开挖轮廓的节理更易导致岩爆的发生,而其倾角的改变对岩爆的影响较弱;围岩内节理面的存在,使应力在节理面与开挖边界之间的薄层岩体中迅速集中,并且最大主应力在该薄层岩体的集中区域会出现应力由围岩表面过渡到围岩内部的情况,该应力边界为内凹型圆弧状,与岩爆后的“V”型或“平底锅”型爆坑类似。研究结果对实际工程的规划选线、岩爆预测及岩爆防治有一定的参考价值。Under the action of structural stress,the internal joints of rock mass are generally developed,and the joints have an important effect on the occurrence of rockburst in deep tunnels.In order to study the relationship between the joints distribution and rockburst failure,based on the distribution law of rockbursts and structural joints in Caoguoshan tunnel,the distribution characteristics and evolution process of fractures are analyzed through acoustic emission data,and Rock Failure Process Analysis Software(RFPA)is used for research.The results show that the joints parallel to the tunnel axial direction are more likely to cause rockburst than those perpendicular to the tunnel axial direction.The joints hidden inside the surrounding rock and close to the excavation contour are more likely to cause rockbursts,while the change of their dip angle has little effect on the rockbursts.The existence of joint surfaces in the surrounding rock makes the stress rapidly concentrate in the thin rock mass between the joint surface and the excavation boundary,and the maximum principal stress will transition from the surface of the surrounding rock to the interior of the surrounding rock,and the stress boundary is in the shape of a concave arc,similar to the"V"or"pan"type blasting crater after rockburst.The research results have certain reference value for the planning and route selection,rockburst prediction and prevention of actual projects.

关 键 词：深埋隧道 构造节理 岩石破裂过程分析软件 岩爆模式 

分 类 号：U458.3[建筑科学—桥梁与隧道工程]