摘要
为探明高地应力隧道爆喷型岩爆演化过程,采用矩阵离散元MatDEM,模拟分析爆喷型岩爆现象,探讨爆喷型岩爆机制.结果表明:(1)爆喷型岩爆是一种缝合带区富含细观裂隙挤压硬岩隧道开挖卸荷扰动作用下,围岩发生突然高速喷射并伴有大量粉尘的现象;(2)爆喷型岩爆演化过程为4个阶段:裂隙激活及发展阶段、裂隙聚集碎岩阶段、破碎岩块高速喷射阶段、破碎岩块自由落体阶段;(3)爆喷型岩爆地质力学模式为张剪—喷射型:富含细观裂隙的挤压硬岩隧道,在开挖卸荷扰动作用下,发生以张拉破坏为主,剪切破坏为辅的聚集性破裂,积聚的弹性应变能突然释放并赋予破碎岩块动能,发生高速喷射.研究成果为缝合带高地应力区硬岩隧道岩爆演化过程提供新的认识.
The occurrence environment and failure characteristics of explosive rockburst were collected and analyzed to explore the formation and evolution process of explosive rockburst in high geo-stress tunnels.The matrix discrete element numerical software MatDEM was used to simulate the phenomenon of explosive rockburst,and the mechanism of explosive rockburst was discussed.The results show that:(1)Explosive rock burst is a new type of rock burst phenomenon,rich in meso-fractures and squeezes rigid rock tunnels in high ground stress area of the suture zone.Under the action of excavation unloading disturbance,the surrounding rock bursts and breaks,and the sudden high-speed jet is accompanied by a large amount of dust.(2)The formation and evolution process of rockburst is divided into four stages:fracture activation and development stage,fracture aggregation and broken rock stage,high-speed jetting stage of broken rock block,and free-falling stage of broken rock block.(3)It is revealed that the geomechanical model of rockburst is tension-shear-jet type:under the action of excavation unloading disturbance,the surrounding rock of extruded rigid rock tunnel,which is rich in micro-fractures occurs aggregation fracture with tension failure as the primary and shear failure as the auxiliary.The elastic strain energy accumulated by the original extrusion suddenly releases and gives the broken rock high kinetic energy,and then the high-speed jet occurs.The research results provide a new understanding of rockburst formation and evolution process in complex rock tunnels in high-stress areas of the suture zone.
作者
孟陆波
李昊禹
李天斌
李攀
张彩虹
Meng Lubo;Li Haoyu;Li Tianbin;Li Pan;Zhang Caihong(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu,Sichuan 610059,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2024年第8期2789-2798,共10页
Earth Science
基金
国家自然科学基金资助项目(No.42130719)
地质灾害与地质环境保护国家重点实验室自主研究课题(No.SKLGP2022Z003)
四川省自然科学基金项目(No.2022NSFSC0411)。
关键词
爆喷型岩爆
岩爆机制
细观裂隙
MatDEM
工程地质
explosive rockburst
rockburst mechanism
microscopic cracks
MatDEM
engineering geology.
