覆盖型岩溶路基塌陷机理与注浆加固方法

Collapse Mechanism and Grouting Reinforcement of Covering Karst Subgrade

覆盖型岩溶基本特征是地下水水位变化频繁和地层浅部土洞、溶洞发育。覆盖型岩溶地区主要工程地质问题是地面塌陷,地面塌陷的成因很多,往往是多种机制综合作用的结果,如地下水位下降形成真空吸蚀作用、地下水潜蚀作用、荷载振动作用、加荷作用等,构成铁路安全运营隐患。针对赣韶铁路岩溶发育特征与规律,对其覆盖型岩溶路基进行注浆加固处理,论述了钻孔注浆加固的设计要求、注浆量计算方法、施工工艺及技术要求。经多种手段检验,表明注浆加固效果良好。

The basic characteristics of covering-karst are frequent change of groundwater level, the development of soil cave and karst cave at the superficial part of strata. As the main engineering-geological problem in covering-karst region, land collapse is usually caused by comprehensive action of many different effects, such as the vaccum absorbing corrosion caused by decrease of groundwater level, suffusion of goundwater, load vibration, and loading effect, etc. , and creates hidden trouble to railway operation safety. Aiming at the development feature and regulation of karst section, reinforcement method of grouting is performed on covering-karst subgrade in Gan（Zhou）-Shao（Guan） Railway. This paper discussed the design requirements of hole grouting, calculation method of grouting Capacity, construction technology and technical requirements. The test of many kinds of inspection means showed that the grouting reinforcement effect is good.