Dewatering induced karst collapse conditions and safety prevention and control measures in Nanning subway construction
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摘要: 抽排地下水是触发岩溶塌陷的重要因素，但抽排地下水诱发岩溶塌陷的临界参数及安全防控措施研究较少。文章以南宁市地铁4号线体育中心东地铁站为例，分析其施工降水诱发岩溶塌陷的条件。根据崩解试验及管道流试验，得出非饱和土体和饱和土体的岩溶塌陷发育临界条件参数，并提出地表阻水、控制土体含水量高于14.65%、控制抽水量小于4.4 m3· d-1 3种安全措施防止岩溶塌陷发生。Abstract: Extracting groundwater is an important factor triggering karst collapse. However, there are few studies on critical parameters and safety prevention and control measures for karst collapse induced by extracting groundwater. Taking the East Metro Station of Sports Center No. 4 of Nanning subway as an example, this paper analyzes the conditions of karst collapse induced by dewatering during the construction. According to the disintegration test and the pipeline flow test, the critical condition parameters of karst collapse development of unsaturated soil and saturated soil are obtained. Three safety measures are proposed to effectively prevent karst collapse, such as the surface water blocking, controlling soil water content higher than 14.65%, and controlling pumping rate less than 4.4 m3·d-1.
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