在南水北调穿淇河倒虹吸工程泥灰岩地基中发育有岩溶，采用调查统计的方法，结合物探、钻探等手段对场区倒虹吸地基岩溶发育情况进行勘察，并取场区岩石、充填物，以及地下水、河水进行试验、分析。结果表明：岩溶成因是特殊地质条件组合形成的，岩溶发育的形态以溶蚀坑、缝为主，发育强度及发育程度分级为中等。岩溶对倒虹吸地基稳定影响较大，需采取必要的处理措施，结合工程特点，综合考虑工程安全、投资、工期、场地条件、处理效果等因素，经过方案比选，采用换填＋截渗墙方案处理地基。%Karst highly develops in mari stratum on the project site of the Qihe River siphon of the South-to-North Water Diversion Project. By using investigation and statistics methods,combining with the geophysical,drilling and other means of methods,it surveyed the karst and bedrock devel-opment of inverted siphon and tested and analyzed by using the site rock,filling,groundwater and river water. The results show that karst is a spe-cial geological condition combination form,shape of karst dominated by corrosion pits,seam the development,classification and development de-gree of medium strength. Karst has greater influence on inverted siphon foundation stability,needs to take measures,combined with engineering characteristics,considering the engineering safety,investment,construction period,site condition,the treatment effect and other factors,after a plan selection,with soil replacement and diaphragm wall for foundation treatment.
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