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S119线改建工程水西大桥处于岩溶区,结合其桩基施工过程和勘查资料,研究了桥址区串珠状岩溶的赋存特征,探讨了引发漏浆、塌孔险情的机制。结果表明,串珠状岩溶分布与区域地质资料基本一致,但局部分布差异性大,无明显规律性。串珠状岩溶连通性好,岩体破碎、裂隙发育,是引发漏浆的主要原因;桩基施工中潜蚀、软化作用明显,施工振动易引发局部塌孔,真空效应和拖曳作用又致使上部孔壁的进一步坍塌。
The reconstruction of S119 line Shixi Bridge is located in the karst area. Combined with the pile foundation construction process and exploration data, the occurrence characteristics of beaded karst in the bridge site are studied, and the mechanism leading to leakage of mortar and collapsible hole is discussed. The results show that the beaded karst distribution is consistent with the regional geological data, but the local distribution is quite different with no obvious regularity. Beaded karst connectivity is good, the rock mass is broken, the development of fractures is the main reason leading to leakage of grouts; Erosion, softening effect is obvious during the pile foundation construction, local collapse is easy to occur due to construction vibrations, and the vacuum effect and the drag effect cause the upper hole The walls collapsed further.