昆明轨道交通岩溶专项勘察手段及方法

Special Investigation Means and Methods of Karst of Kunming Rail Transit

为解决传统勘察手段及方法很难查明岩溶发育特征的难题,以昆明轨道交通4号线岩溶专项勘察为案例工程,介绍在岩土工程初步勘察、详细勘察的基础上,采用以工程地质钻探及现场物探测试(孔间层析成像(CT)、高密度电法、地质雷达)为主,并结合工程地质测绘、原位测试、钻孔抽水试验和室内土工试验等综合勘察技术手段和方法,查明了线路沿线的岩溶分布、规模及形态等发育特征,并对其做出定量或定性评价,为岩溶专项治理施工图设计、优化设计方案及完善施工组织设计等提供了可靠的地质依据,对类似工程具有一定的指导及参考作用。

The developing characteristics of karst cannot be cleared by traditional investigation methods.Hence,the investigation work of karst of Kunming Rail Transit Line 4 is taken for example to introduce the preliminary and detailed investigations of geotechnical engineering.And then the engineering geological drilling and field geophysical testing(cross-hole tomography(CT),high density electrical method and geological radar)are taken as the main investigation methods,and engineering geological surveying,in-situ testing,borehole pumping test and indoor geotechnical testing,etc.are adopted as well to learn the distribution,scale and shape of karst along the line.And a quantitative or qualitative evaluation is carried out.The results can provide reliable geological basis for the design of karst special treatment construction drawings,optimization of design schemes and improvement of construction organization design.