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结合阿尔塔什水利枢纽2号深孔排沙放空洞龙抬头直线段开挖工程实例,对层状岩层高临空面地下洞室开挖与支护技术进行探讨。实践证明,高临空面地下洞室开挖中应重点考虑施工台车的整体刚度和稳定性,通过根据围岩的揭露情况及时调整施工方案,不仅有利于围岩的稳定性,而且可以加快施工进度,节约工程造价。
The excavation and support technology of the underground cavern with high-level ground plane in stratified rock formation is discussed in combination with the example of the straight-line excavation of No.2 deep-hole sand drainage in the Altase Hydropower Project. It has been proved that the overall rigidity and stability of the construction trolley should be considered in the excavation of underground cavern in high-altitude surface. The timely adjustment of the construction scheme according to the revelation of the surrounding rock not only helps the stability of surrounding rock but also accelerates Construction progress, saving construction costs.