岩溶地区高填方路基岩溶塌陷机理及处理措施  

Mechanism and Treatment Measures of Karst Collapse of High Fill Subgrade in Karst Area

作　　者：张蕊[1] 张大可[1] 石有权[1] 张贵斌[1] ZHANG Rui;ZHANG Da-ke;SHI You-quan;ZHANG Gui-bin(Kunming Survey,Design and Research Institute Co.,Ltd.of CREEC,Kunming 650200,China)

机构地区：[1]中铁二院昆明勘察设计研究院有限责任公司,云南昆明650200

出　　处：《云南水力发电》2022年第8期130-133,共4页Yunnan Water Power

基　　金：国家自然科学基金项目(41602294)。

摘　　要：岩溶地区既有铁路高填方路基岩溶塌陷病害频发,影响铁路安全运营,引发大量环境地质问题。针对既有线高填方路堤岩溶病害,分析高填方段路堤岩溶塌陷形成机理,指出地下水和列车动荷载的双重作用是导致溶洞洞顶的岩土体结构、岩溶溶蚀破碎带遭到破坏而形成岩溶塌陷的原因;提出高填方段路堤岩溶整治措施:对于岩溶埋深较浅且与下伏岩溶管道未连通或第四系底部的风化裂隙地段,针对第四系底部基岩风化裂隙带进行注浆加固即可,对于岩溶埋深较深或埋深浅且与下伏岩溶管道连通地段,宜着眼于截断岩溶管道即可;最后通过工程实例验证了通过钻孔注浆截断地表水渗流通道,切断土石界面的岩溶通道,阻止上覆土层颗粒运移,能达到整治岩溶塌陷的目的。In karst area,karst collapse of existing high filling subgrade of railway occurs frequently,which affects the safe operation of railway and causes a lot of environmental and geological problems.In view of karst diseases of high filling embankment,this paper analyses the formation mechanism of karst collapse of embankment in high filling section,and points out that the dual action of groundwater and dynamic load of trains is the cause of karst collapse caused by the destruction of rock-soil structure and karst corrosion fracture zone on the top of karst cave.Measures for Karst Treatment of embankment in high fill section are proposed.For the section with shallow karst buried depth and unconnected with underlying karst pipeline or weathered fissure at the bottom of Quaternary system,grouting reinforcement is required for the weathered fissure zone of bedrock at the bottom of Quaternary system.For sections with deep or shallow buried karst and connecting with underlying karst pipelines,the karst pipelines should be cut off.Finally,it is verified by an engineering example that cutting off surface water seepage passage by drilling and grouting can cut off the karst passage at the earth-rock interface,prevent the particle movement of overlying soil layer and achieve the purpose of regulating karst collapse.

关 键 词：岩溶地区 高填方路基 岩溶塌陷 处理措施 

分 类 号：U213.14[交通运输工程—道路与铁道工程]