邻洞爆破下软弱夹层对洞库稳定性的影响研究  

Study on influence of weak inter-layer under adjacenttunnel blasting on stability of tunnel vault

作　　者：邓运辰 上官志浩 杨奥天 林城 刘鑫[1] 罗忆[1,2] 郑世龙 DENG Yunchen;SHANGGUAN Zhihao;YANG Aotian;LIN Cheng;LIU Xin;LUO Yi;ZHENG Shilong(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;Sanya Science and Education Innovation Park,Wuhan University of Technology,Sanya 572024,China;Wuhan Tianhan Engineering Quality Testing Co.,Ltd.,Wuhan 430020,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070 [2]武汉理工大学三亚科教创新园,海南三亚572024 [3]武汉天汉工程质量检测有限责任公司,湖北武汉430020

出　　处：《水利水电快报》2024年第10期74-82,共9页Express Water Resources & Hydropower Information

基　　金：海南省自然科学基金创新研究团队项目(521CXTD444);国家大学生创新创业训练计划(202310497083)。

摘　　要：为了研究邻洞爆破下软弱夹层对压气储能洞库稳定性的影响,基于弹塑性损伤理论框架,采用COMSOL Multiphysics数值仿真,将储气过程视为静态过程,考虑了岩石的塑性变形机制和刚度退化,通过对等效塑性应变表征岩石损伤变量的演化研究,分析夹层厚度、倾角和位置对内衬洞室稳定性的影响。结果表明:①随着夹层厚度的增加,靠近夹层部分的衬砌塑性应变增量增加,且最靠近夹层处受夹层影响最大。②夹层倾角从30°增加至90°过程中,会增加洞室左侧塑性变形,当夹层倾角小于45°时,倾角改变对质点峰值摇动速度PPV最大值影响较小,而当夹层倾角大于45°后,PPV最大值随夹角增加显著增大。③夹层距离洞室边界小于0.2 r时,距离的增加使最靠近夹层处衬砌最大塑性应变增量显著下降;间距大于0.2 r时,最大塑性应变增量随间距增加的变化较小,对稳定性影响相对较小。研究成果可以为压缩空气储能洞库的设计和施工提供参考。In order to study the influence of soft inter-layer under adjacent tunnel blasting on the stability of compressed air storage tunnel,we employed the framework of elastoplastic damage theory and numerical simulation by using COMSOL Multiphysics.The gas storage process was treated as a static process,taking into account the plastic deformation mechanism and stiffness degradation of rocks.The evolution of damage variables in rocks was characterized by equivalent plastic strain,and the effects of thickness,angle,and location of inter-layer on the stability of inner tunnels were analyzed.The results indicate that:①As the inter-layer thickness increases,the plastic strain increment in the vicinity of the inter-layer increases,and the area closest to the inter-layer is most affected.②As the inter-layer angle increases from 30°to 90°,it enhanced plastic deformation on the left side of the tunnel.When the inter-layer angle was less than 45°,changes in the angle had minimal effects on the maximum PPV value.However,when the inter-layer angle exceeded 45°,the maximum PPV value increased significantly with angle.③When the distance between the inter-layer and tunnel boundary was less than 0.2 r,the maximum plastic strain increment decreases with the increasing spacing at the inter-layer.However,when this distance exceeded 0.2 r,changes in this distance had minimal effects on stability.The study can provide a reference for the design and construction of compressed air energy storage tunnels.

关 键 词：软弱夹层 压气储能洞库 稳定性 PPV 

分 类 号：TU45[建筑科学—岩土工程]