爆破作用下浅埋偏压隧道围岩突变失稳判据研究  

Research on Catastrophe Instability Criterion of Surrounding Rock under Blasting Action in Shallow-buried Tunnel with Unsymmetrical Pressure

作　　者：马荣增 李文 杜泽辉 彭亚雄 吴立[4] MA Rong-zeng;LI Wen;DU Ze-hui;PENG Ya-xiong;WU Li(CCCC SHEC(Kunming)Construction Co.,Ltd.,Kunming 650200,China;CCCC Wuhan Harbour Engineering Design and Research Co.,Ltd.,Wuhan 430040,China;Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring,Hunan University of Science and Technology,Xiangtan 411201,China;Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中交二航局(昆明)建设有限公司,昆明650200 [2]中交武汉港湾工程设计研究院有限公司,武汉430040 [3]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,湘潭411201 [4]中国地质大学(武汉)工程学院,武汉430074

出　　处：《爆破》2024年第4期54-60,共7页Blasting

基　　金：江汉大学省部共建精细爆破国家重点实验室、江汉大学爆破工程湖北省重点实验室联合开放基金资助(PBSKL2022D08);湖南省教育厅科学研究项目(22B0486)。

摘　　要：为解决浅埋偏压隧道爆破失稳问题,考虑爆破损伤与水弱化效应,利用尖点突变模型建立了爆破作用下浅埋偏压隧道围岩突变失稳判据,并探讨了水弱化效应、爆破损伤效应和偏压程度对围岩失稳的影响。以国家高速G5615(天保-麻栗坡段)大岩矸隧道为例,计算了不同工况下围岩突变判据k值,判定了浅埋偏压隧道围岩稳定性状态。结果表明:爆破作用下浅埋偏压隧道发生突变失稳的必要条件是突变判据k<1,表示隧道可能处于突变失稳状态;偏压程度是影响隧道围岩失稳的关键内在因素,偏压程度越大越容易发生突变失稳;实际工程评价结果与现场情况一致,验证了该判据的实用性与有效性。To address the instability problem of shallow-buried tunnel with unsymmetrical pressure under blasting,the potential energy equation of surrounding rock was derived by considering both blasting damage and water weakening effect.Using the cusp catastrophe theory and its calculation method,a catastrophe instability criterion of surrounding rock mass in a shallow-buried tunnel with unsymmetrical pressure under blasting was established.Then,the effects of water weakening,blasting damage and unsymmetrical pressure on the instability of the surrounding rock mass were discussed.Taking Dayangan tunnel in the national high-speed G5615(Tianbao-Malipo section)as an example,a catastrophe criterion k of surrounding rock mass under different working conditions was calculated according to the physical and mechanical parameters of surrounding rock and the results of the field acoustic wave test.Meanwhile,a shallow-buried tunnel's surrounding rock stability state with unsymmetrical pressure was determined.The results show that the necessary condition for abrupt instability in shallow-buried tunnels with biased pressure under blasting is the abrupt failure criterion k<1,indicating a potential state of abrupt instability.The degree of bias pressure is the critical internal factor affecting tunnel instability surrounding rock mass.Additionally,the greater the degree of bias pressure,the more prone the tunnel is to sudden instability.The practical evaluation results are consistent with the field observations,verifying the practicability and validity of the criterion.

关 键 词：隧道 爆破 浅埋 偏压 突变失稳 

分 类 号：TD235.1[矿业工程—矿井建设]