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岩溶地区地质环境复杂,基坑支护设计挑战较大。基于岩溶地区的某基坑支护工程实例,一方面通过采用已施做的支护桩揭露的地质情况修正地质剖面中岩面线和溶洞分布情况的方法进行入岩深度的动态确定;另一方面通过注浆率判定锚索穿过的不明溶(土)洞大小和位置,合理调整锚索角度、位置等避开溶(土)洞。结果表明,对岩溶地区基坑支护工程支护桩进行动态设计确保了基坑安全可靠。
The geological environment in karst area is complex, and the design of foundation pit support is more challenging. Based on the example of a foundation pit supporting project in karst area, on the one hand, dynamic determination of rock depth was carried out by modifying the distribution of rock line and cave in the geological section by using the geological conditions exposed by the existing supporting pile; In terms of grouting rate, the size and location of unknown solute (soil) holes passing through the anchor cable are determined, and the angle of the anchor cable and the location are adjusted reasonably to avoid the dissolution (soil) hole. The results show that the dynamic design of supporting piles in foundation pit supporting project in karst area ensures the foundation pit is safe and reliable.