大西客运专线小角度穿越地裂缝带的模拟分析  

Simulation Analysis of Datong-Xi'an Passenger Dedicated Railway Crossing Ground Fissure Belt with a Small Angle

作　　者：李明俐 杨涛 杨宗佶[1] 黄强兵[4] LI Mingli;YANG Tao;YANG Zongji;HUANG Qiangbing(Institute of Mountain Hazards and Environment,CAS,Chengdu Sichuan 610041,China;University of Chinese Academy of Sciences,Beijing 100049,China;Sichuan Huadi Construction Engineering Limited Liability Company,Chengdu Sichuan 610041,China;Key Laboratory of Western China's Mineral Resources and Geological Engineering,Ministry of Education,Chang'an University,Xi'an Shaanxi 710054,China)

机构地区：[1]中国科学院水利部成都山地灾害与环境研究所,四川成都610041 [2]中国科学院大学,北京100049 [3]四川省华地建设工程有限责任公司,四川成都610041 [4]长安大学西部矿产资源与地质工程教育部重点实验室,陕西西安710054

出　　处：《铁道建筑》2017年第9期112-115,共4页Railway Engineering

基　　金：中国科学院科技服务网络计划(KFJ-EW-STS-094;KFJ-STSZDTP-015);国家自然科学基金(41471012);国土资源大调查项目(1212010641403)

摘　　要：运用MIDAS/GTS软件对大西客运专线路基小角度穿越地裂缝带进行模拟,研究路基应力场和位移场的变化规律。计算结果表明:交角越大复合地基抵抗沉降变形的能力越强;小交角条件下路基地基钢筋混凝土板上盘受压,下盘受拉,底板纵向应变随上盘沉降的增加而增大,是明显的横"S"形反对称规律;交角为15°,30°,45°时,地裂缝作用下路基底部钢筋混凝土板开裂破坏对应的上盘沉降临界值分别为20,10,5 cm。The Datong-Xi'an passenger dedicated railway crossing the ground fissure belt with a small angle was simulated by using MIDAS/GTS software and the variation law of subgrade stress field and displacement field was studied T he calculation results show that the ability of composite foundation to resist settlement deformation is strong with the angel increasing,the upper plate of subgrade foundation reinforced concrete base slab is pressed and the bottom plate of that is pulled under the condition of small angle,the longitudinal strain of base slab increases with settlement of upper plate increasing,which shows the obvious horizontal S type antisymmetric law,and the upper plate settlement thresholds for cracking failure of the subgrade bottom reinforced concrete base slab under the action of ground fissure are20cm,10cm and10cm respectively when the subgrade crosses the ground fissure with the angle of15°,30°and45°.

关 键 词：客运专线 铁路路基 斜交角 数值模拟 地裂缝 沉降变形 路基底板 

分 类 号：U213.1[交通运输工程—道路与铁道工程]