深埋隧洞岩爆时间滞后性机理研究  

The mechanism of time-delayed rockburst for deep tunnel

作　　者：陈浩哲 邵珠山[1,2,3] 朱意明 韩邹红 CHEN Haozhe;SHAO Zhushan;ZHU Yiming;HAN Zouhong(Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering,Xi’an University of Architecture and Technology,710055 Xi'an,China;School of Civil Engineering,Xi’an University of Architecture and Technology,710055 Xi'an,China;School of Science,Xi’an University of Architecture and Technology,710055 Xi'an,China)

机构地区：[1]西安建筑科技大学陕西省岩土与地下空间工程重点实验室,西安710055 [2]西安建筑科技大学土木工程学院,西安710055 [3]西安建筑科技大学理学院,西安710055

出　　处：《应用力学学报》2022年第1期19-25,共7页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目(No.11872287);陕西省重点研发计划资助项目(No.2019ZDLGY01-10)。

摘　　要：深埋隧洞内岩爆生成的时间滞后性与硬脆性围岩的蠕变力学特性密切相关,通过结合理论模型(包含深埋隧洞弹塑性模型及岩石脆性蠕变失效模型)与数值模拟对岩爆的时间滞后性机理及其规律进行了分析讨论。结果表明:深埋隧洞在开挖卸荷后围岩内部因微缺陷的萌生及演化引起损伤累积,在无及时支护条件下短时期内易引发时滞性岩爆;围岩在塑性区内更易引发蠕变失效,失效时长随距隧洞开挖边界距离的增加而增加;围岩在强开挖损伤区内更易失稳,需及时支护避免次生岩爆;随着隧洞开挖半径的增加,围岩的滞后性失效时长与开挖损伤区范围均增加。The time delay of rockburst in deep tunnels is closely related to the creep mechanical properties of hard and brittle surrounding rocks.Therefore,the time-delayed mechanism and laws of rockburst were analyzed and discussed by combining the theoretical approach(including elastoplastic model for deep tunnel and brittle creep failure model for rocks) and the numerical simulation.The results show that after the excavation and unloading of the deep tunnel,the damage accumulation occurs inside the surrounding rock due to the generation and development of micro-defects,which easily triggers time-delayed rockburst in a short period without timely support.The surrounding rock is more inclined to creep failure in the plastic zone and the failure duration increases with the distance from the excavation boundary.The surrounding rock presents more instability in the strong excavation damaged zone,needing to be supported in time to avoid a secondary rockburst.As the excavation radius of the tunnel increases,both the delayed failure duration of surrounding rocks and the scope of the excavation damaged zone increase.Furthermore,the research results provide some reference and enlightenment for exploring the mechanism,disaster prediction and prevention of time-delayed rockburst.

关 键 词：岩爆 时间滞后性 脆性岩石 蠕变 开挖损伤区 

分 类 号：TU452[建筑科学—岩土工程]