岩溶区水环境作用在役隧道衬砌结构的变形特征分析  

Analysis for the deformation threat of the lining structure of the in-service tunnels in water environment of karst areas

作　　者：董辉[1,2] 杨晓晖 衣智明 罗正东 DONG Hui;YANG Xiao-hui;YI Zhi-ming;LUO Zheng-dong(College of Civil Engineering and Mechanics,Xiangtan University,Xiangtan 411105,Hunan,China;Key Laboratory of Geotechnical Mechanics and Engineering Safety in Hunan Province,Xiangtan 411105,Hunan,China;China Hydropower Engineering Bureau 8 Co.,Ltd.,Changsha 410000,China)

机构地区：[1]湘潭大学土木工程与力学学院,湖南湘潭411105 [2]岩土力学与工程安全湖南省重点实验室,湖南湘潭411105 [3]中国水利水电第八工程局有限公司,长沙410000

出　　处：《安全与环境学报》2019年第5期1595-1604,共10页Journal of Safety and Environment

基　　金：国家自然科学基金项目(51108397);湖南省自然科学基金项目(2015JJ2136);湖南省教育厅优秀青年基金项目(16B255)

摘　　要：为研究岩溶区地质环境因素对在役隧道衬砌结构变形的影响问题,以岩溶地区典型在役隧道为依托,在降雨条件下,考虑溶洞布置形态、直径、溶洞与隧道间距、节理面倾角等地质环境因素,通过相似物理模型试验和数值模拟,对衬砌表面应变、孔隙水压力、围岩压力和位移分别进行分析。主要结论如下:1)衬砌表面孔隙水压力主要受到节理面倾角和溶洞布置形态的影响,且节理倾角的作用强于溶洞布置形态,竖向正交溶洞布置截面孔隙水压力变化区间约为斜向布置截面的10倍,且衬砌顶部测点位置孔隙水压力变化区间约为底部测点位置的10倍。2)衬砌表面围岩压力随节理面倾角和溶洞直径的增大而减小,溶洞距离l和倾角θ之间符合l≤-0.4θ+30时,衬砌表面有明显的受压增大趋势。3)衬砌结构变形最大的参数组合为:节理倾角在50°~55°,溶隧距离为1. 5倍隧道直径,溶洞沿顺层节理分布,溶洞直径为3/4倍隧道直径和斜向截面布置形态。研究结果可为预测在役隧道可能危险区域提供参考,对岩溶区隧道灾害的研究具有一定参考意义。In order to study the impact of the geological environmental factors in the karst areas on the deformation of lining structure of in-service tunnels,the paper has taken into account such factors as the configuration,diameter and distance between the karst tunnels based on the typical in-service tunnels in the karst areas under the condition of rainfall. For the above mentioned purpose,we have made similar physical model tests and numerical simulations,so as to identify and determine the surface strain,the pore water pressure,with the comparison and analysis of the surrounding rock pressure and the displacement of lining area through similar physical model tests and numerical simulations. The above said numerical simulations and tests let us gain the following main conclusions:( 1) The pore water pressure on the lining surface is mainly affected by the dip angle of the joint surface and the configuration of the cave,whereas the effect of the joint dip angle should be stronger than that of the cavity layout,and the pore water pressure of the vertical orthogonal cavern layout section should in turn be stronger than that of the cavern layout. Therefore,if the variation interval is about 10 times of that of the inclined section,the variation interval of the pore water pressure at the top of the lining should be equal about to 10 times as much as that measured from the bottom point;( 2) The earth pressure on the lining surface tends to decrease with the increase of the joint inclining angle and the diameter of the cave. For instance,in case when the distance between the cavern and the dip angle is corresponding to each other,there should be existing an obvious increasing tendency of compression on the surface of the lining;( 3) The maximum deformation parameter synthesis of the lining structures can be deduced as follows: The joint inclination angle: 50 °-55 °: the solution tunnel distance: 1. 5 times as that of the diameter of the tunnel,whereas the karst tunnel should be lying along the bedding joints.And,the diame

关 键 词：安全工程 岩溶 在役隧道 衬砌结构 变形特征 

分 类 号：X951[环境科学与工程—安全科学]