山区控制性水利枢纽工程泄洪洞掘进施工工法比选研究

Study on comparison and selection of construction methods for spillway tunnel excavation of controlled water control project in mountainous area

穿越复杂地质地段的地下洞室施工难度较大,需要选择合适的施工方案和工程技术。文章以乌苏市四棵树河吉尔格勒德水利枢纽工程泄洪洞进口穿越卵砾石段为例,利用现场试验的方法对施工开挖工法和开挖步长进行对比和优化研究,结果显示七步法开挖施工对围岩的扰动相对较小,为最佳施工方法,结合位移模拟计算结果和工程成本,建议在采用七步法施工中采用1.0m的开挖进尺。

Since the great difficulty of constructing underground cavern passing through complex geological area,it is necessary to select the appropriate construction scheme and engineering technology.Taking the gravel gravel section at the entrance of spillway tunnel of the Sikeshu River in Wusu city as an example,this paper compares and optimizes the excavation method and excavation step length by using the field test method.The results show that the seven-step excavation method has relatively small disturbance to the surrounding rock,which could be considered as the best construction method.Combined with the displacement simulation calculation results and the project cost,it is suggested that the excavation footage of 1.0m should be adopted in the construction using seven-step excavation method.