穿越富水断层带隧道爆破围岩突变失稳判据研究  

Study on catastrophe instability criterion of surrounding rock in tunnels blasting crossing water-rich fault zones

作　　者：彭亚雄 刘广进 黄智刚 吕虎波 吴立[2] PENG Yaxiong;LIU Guangjin;HUANG Zhigang;LYU Hubo;WU Li(Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring,Hunan University of Science and Technology,Xiangtan Hunan 411201,China;Faculty of Engineering,China University of Geosciences,Wuhan Hubei 430074,China;Fuzhou Water Affairs Pintan Water Diversion Development Co.,Ltd.,Fuzhou Fujian 350001,China;Zhejiang Tunnel Engineering Group Co.,Ltd.,Hangzhou Zhejiang 310005,China)

机构地区：[1]湖南科技大学岩土工程稳定控制与健康监测湖南省重点实验室,湖南湘潭411201 [2]中国地质大学(武汉)工程学院,湖北武汉430074 [3]福州水务平潭引水开发有限公司,福建福州350001 [4]浙江省隧道工程集团有限公司,浙江杭州3100303

出　　处：《中国安全科学学报》2022年第5期104-111,共8页China Safety Science Journal

基　　金：国家自然科学基金资助(41672260);湖南省自然科学基金资助(2020JJ5163);湖南省教育厅科学研究项目(19C0736,20C0815)。

摘　　要：为解决穿越富水断层带隧道爆破失稳问题,基于爆破作用下隧道-断层系统失稳的力学模型,考虑爆破与地下水共同作用影响,建立穿越富水断层带隧道失稳的尖点突变模型,揭示隧道-断层系统围岩失稳机制,形成围岩失稳判据,并以福建平潭及闽江口水资源配置为例,评价穿越富水断层带隧道围岩的稳定性。结果表明:穿越富水断层带隧道围岩失稳是系统内部与外部因素共同作用的结果;在长期水岩作用与累积爆破作用下,富水断层带中围岩力学性质不断弱化,突变判据k值不断降低,导致围岩失稳破坏的可能性提高;利用失稳判据获得的失稳风险评价结果与现场工况一致。In order to solve instability problems of tunnels blasting through rich water fault zones,based on instability mechanical model of tunnel-fault system under blasting,a cusp catastrophic model was established considering the combined effects of blasting and groundwater.Instability mechanism of surrounding rock under tunnel-fault system was revealed,and its instability criterion was developed.Then,with resource allocation project of Pingtan and Minjiangkou in Fujian as an example,rock stability of tunnels crossing water-rich fault zones was evaluated.The results show that the instability of surrounding rock is a result of internal and external factors.Due to long-term water-rock interaction and cumulative blasting,mechanical properties of surrounding rock in water-rich fault zones are constantly weakened,and catastrophe criterion,k value,is constantly reduced,which probably leads to instability and failure of the rock.The results of instability risk evaluation based on the criterion are consistent with field conditions.

关 键 词：富水断层带 隧道爆破 失稳判据 地下水 尖点突变模型 

分 类 号：X913.4[环境科学与工程—安全科学]