超大直径调压井开挖一次支护及围岩稳定分析研究

Analysis on Primary Support and Rock Stability in Excavation of Super Large Diameter Surge Shaft

超大直径调压井的开挖及围岩稳定直接影响调压井整体结构稳定和工程量,是关系调压井及发电引水系统安全性、工期和工程投资的关键问题。结合新疆某工程超大直径调压井,总结国内外超大直径调压井的开挖支护措施,根据本工程初拟的调压井开挖及一次支护措施,对调压井围岩进行整体稳定性计算,确定其支护参数的可靠性。超大直径调压井一次支护措施及围岩稳定计算方法可为今后超大直径调压井开挖支护措施选择提供参考。

The excavation of super large diameter surge shaft and stability of surrounding rock have direct impact on the overall structural stability and quantities of surge shaft,this is a key issue related to the safety,construction period and investment of surge shaft and water diversion system.In combination with a super large diameter surge shaft in Xinjiang,this paper summarizes the excavation and support measures of super large diameter surge shaft at home and abroad.The overall stability of surrounding rock of surge shaft is calculated according to the proposed excavation and primary support measures to determine the reliability of support parameters.The primary support measures and rock stability calculation method provide a reference for the selection of excavation and support measures for super large diameter surge shaft in the future.