管道线路岩溶勘察工作重点及方法

Key work and methods for investigation of karst along pipeline route

管道线路岩溶勘察有别于常规的线路勘察,其勘察工作要点集中在详勘阶段,遵循从面到点、先地表后地下、先定性后定量、先控制后一般以及先疏后密的工作准则。采用工程地质测绘、钻探、物探、水文地质试验和室内实验等勘察方法,重点对管道沿线岩溶的分布和工程地质条件,对管道线路安全有影响的岩溶洞穴的位置、规模、形态、埋深、稳定性、岩溶堆积物(红粘土、软土)的性状,以及地下水特征进行分析评价,提出管道工程沿线岩溶塌陷区的分布及工程危害,为设计和施工提供依据,以防止和减少岩溶塌陷对管道的破坏。(图4,参10)

The karst survey along pipeline route is different from that of normal pipeline route, its key jobs are mainly in the phase of detailed reconnaissance, and follows the working principles of ＂from surface to point, surface before underground, qualitative before quantitative, limited before normal and loose before intensive＂. Survey methods such as engineering geological surveying, drilling, geophysical prospecting, hydrogeology experiments and laboratory experiments are adopted to analyze and evaluate the distribution of the karst along the pipeline and engineering geological conditions, the position, scale, morphology, buried depth and stability of karst caves and characters of karst accumulations （red clay, soft soil） which have effect on the safety of pipeline route, and characteristics of ground water, the distribution of karst collapse areas along the pipeline route and engineering hazards are pointed out, which can be taken as a foundation in the design and construction in order to prevent and reduce the damage of karst collapse to pipeline. （4 Figures, 10 References）