车辆荷载作用下岩溶路基注浆加固效果分析  

Analysis of Grouting Reinforcement Effect About Karst Embankment Under Vehicle Load

作　　者：郑明新[1] 欧阳林[1,2] 黄文君[1] 袁钎 胡国平[1] 

机构地区：[1]华东交通大学岩土与道桥工程研究所,江西南昌330013 [2]中国建筑西南勘察设计研究院有限公司,四川成都610081

出　　处：《河南科技大学学报（自然科学版）》2015年第3期65-69,75,共6页Journal of Henan University of Science And Technology:Natural Science

基　　金：江西省高等学校科技落地计划基金项目(KJLD13036);江西省研究生创新基金项目(YC2013-S169)

摘　　要：以沪昆高速公路K940＋200处岩溶灾害为例,借助有限元软件ABAQUS建立模型,对岩溶路基的注浆加固效果进行了计算分析。车辆动态荷载采用半波正弦形式,以此来模拟行车驶近和驶离岩溶区这一动态过程。研究结果表明：当4车道均施加行车荷载后,路基变形满足规范要求,行车荷载对路基的影响深度为6～8m,且行车驶离岩溶区过程比驶近过程对路基影响大。同时,考虑了注浆结石体与灰岩之间的接触面和两者的弹性模量对加固效果的影响,发现接触面的存在使注浆结石体与围岩之间产生分离（脱空）现象,且两者弹性模量越接近,溶洞周围应力集中现象越不明显,加固效果越好。Based on the karst embankment of Shanghai-Kunming highway K940 + 200,the model was built to analyze the grouting reinforcement effect of the karst embankment with the help of the FEM software ABAQUS.Half-sine shape was used to simulate the traffic dynamic load and the dynamic process that the car load approached and left the karst area. The results show that when the traffic load is on all the lanes,the deformation of embankment meets the specification requirements. The depth that the traffic load affects the embankment is 6 m to 8 m and the influence is greater when the load leaves the karst area than approaches the area. At the same time,considering the influence of the contact area between the grouting concretion body and the limestone,and their elastic modulus on reinforcement effect,it is found that the separation( disengaging)phenomenon appears because of the existence of the contact surface between the grouting concretion body and wall rock. Also the closer both the modulus of elasticity are,the less obvious the cave surrounding stress concentration phenomenon and the better reinforcement effect is.

关 键 词：岩溶路基 注浆加固 ABAQUS软件 车辆动态荷载 加固效果 

分 类 号：U416.1[交通运输工程—道路与铁道工程]