摘要
研究目的:分析不同地区岩溶地基灾害类型及形成机理,以对其既有铁路岩溶地基灾害进行有效治理,对新建铁路岩溶地基进行合理加固,从而确保岩溶地基铁路安全。研究结论:(1)洛湛铁路岩溶路基主要以地面塌陷危害为主,其塌陷机理主要以地下水波动引起的渗透潜蚀和真空吸蚀作用为主,同时也受人工抽取地下水影响。(2)岩溶路基整治原则为:路堤一般采用注浆加固,路堑采用探灌结合的原则在开挖路基面进行物探及钻孔验证;对埋设较深的溶洞,宜先采用粉煤灰或砂浆充填后再注浆;对裸露或浅埋型,宜采用挖除换填或加混凝土盖板加固。(3)地基注浆过程中边探边注,探注结合,需注意注浆压力与注浆环境变化,严格注浆质量检查,以保证岩溶地基加固效果与稳定。
Research purposes： The analyses of the default types and its forming mechanism of karst subgrade in different areas are made for the purposes of treating the karst subgrade defaults of exsiting railway, reinforcing the karst subgrade of newly - built railway to ensure the safety of the karst subgrade. Research conclusions： （ 1 ） The main default of the karst subgrade of Luoyang - Zhanjiang Railway is the subgrade settlement. The penetration corruption caused by the fluctuation of underground water, vacuum absorptive corruption and pumping underground water by human being are the reasons for the settlement. （2） The treatment principles of karst subgrade are as follows ： To the embankment, grouting will be conducted, to the road cutting, the principle of combining prospecting with grouting will be followed and the verification will be made by prospecting and boring, to the deep buried carst cave, the grouting will be conducted after flyash and mortar fillings, to the open or shallow buried karst cave, the refilling will be conducted after excavation or the concrete cover plate will be added. （3） In the prospecting and grouting process, it is necessary to pay attention to the changes of grouting pressure and environment and control of grouting quality for getting perfect grouting result and good stability of the karst subgrade.
出处
《铁道工程学报》
EI
北大核心
2009年第6期41-43,共3页
Journal of Railway Engineering Society
关键词
洛湛铁路
岩溶路基
地基加固
Luoyang - Zhanjiang Railway
karst subgrade
subgrade reinforcement
