软岩地层中采空隐患区对高铁路堤沉降影响分析  

Analysis one ffect of mined-out area with hidden danger on settlement of high railway embankment in soft rock stratum

作　　者：李伟[1] 王旭春[1] 于云龙[1] 余志伟[1] Li Wei;Wang Xuchun;Yu Yunlong;Yu Zhiwei(School of Civil engineering,Qingdao University of Technology,Qingdao 266033,Shandong)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033

出　　处：《工程建设》2018年第11期15-19,共5页Engineering Construction

摘　　要：以贵南高铁穿越软岩采空区工程为依托,分析了高铁穿越软岩采煤沉陷区的工程重难点问题。基于综合物探和钻探得出的采空隐患区域分布以及试验得到的岩土体物理力学参数,运用FLAC3D数值软件模拟分析了软岩地层中采空隐患区对高铁路堤沉降的影响。通过分析模拟结果得出:高铁荷载作用下,软岩地层中的应力和变形会扩散到埋深90 m范围内的采空隐患区部位,隐患区的变形最终导致路堤表面最大沉降变形为16. 2 cm,可达正常变形(7. 6 cm)的2. 13倍;埋深在90 m左右的采空隐患区域,垂直路堤方向距离大于100 m时,影响程度在2. 5 cm以下;建议采取全胶结注浆法、高架跨越法对隐患区域进行治理,采用复合桩板结构对路基进行加固。Taking for example the engineering of Guinan high-speed railway traversing the soft-rock goaf,the engineering difficulties and problems of high-speed railway crossing the soft rock mining subsidence area are analyzed. Based on the regional distribution of hidden goaf danger obtained by integrated geophysical exploration and drilling and the physical and mechanical parameters of the rock-soilbody obtained by the test,the influence of the existence of the hidden danger areas in soft rock formation on the upper railway embankment are simulated by FLAC3 D numerical simulation software. Through the analysis of the simulation results,it is given that the stress and deformation in the soft rock stratum will spread to the mine-out area of hidden danger with the burial depth within 90 m,and the deformation of the hidden danger area will eventually lead to the maximum settlement deformation of 16. 2 cm in the embankment surface,which is 2. 13 times of normal deformation( 7. 6 cm); When the buried depth is about 90 m in mined-out area of hidden danger,the distance of the vertical embankment is more than 100 m,the degree of influence is less than 2. 5 cm. It is recommended to adopt the full cementing grouting method and the overhead crossing method to treat the hidden danger area,and to use the composite pile board structure to reinforce the subgrade.

关 键 词：采空隐患区 软岩 高铁路堤 数值模拟 沉降变形 

分 类 号：U416.1[交通运输工程—道路与铁道工程]