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在岩溶地区进行机场工程建设,存在流水式溶洞这类复杂的不良地质情况,对其开展处理试验研究,可确保机场使用安全,具有重大的现实意义。本文通过方案比选,提出了“碎石填充+强夯+滤水土工布”的处理方法,并提出了详细的施工技术要点。开展流水式溶洞的强夯密实试验研究,分析夯沉量与夯击次数关系,得出了对流水式溶洞进行强夯密实的施工技术参数。通过面层的载荷试验、不同位置(面层、1m、2m深度)固体体积率检测,对流水式溶洞的地基处理效果进行评价,强夯密实处理满足了设计要求。通过填筑表面沉降监测,对流水式溶洞群的整体处理效果进行检验,工后沉降量完全满足设计要求,处理效果显著。
It is of great practical significance to carry out airport pilot projects in karst areas and to deal with complex experimental and geological conditions such as runoff karst caves. Through the comparison and selection of schemes, this paper puts forward the treatment method of “rubble filling + dynamic compaction + drainage geotextile ” and puts forward the detailed construction techniques. The dynamic compaction test of flowing caves was carried out. The relationship between the amount of compaction and the number of tamping was analyzed, and the technical parameters of strong tamping for convective caves were obtained. Through the surface load test, the detection of the solid volume rate in different positions (surface layer, 1m, 2m depth), the effect of foundation treatment of flowing water cave was evaluated, and the compaction with strong compaction met the design requirements. By filling the surface sedimentation monitoring, the overall effect of water flow caverns were tested, the post-construction settlement fully meet the design requirements, the treatment effect is remarkable.