巴塘水电站全风化地层调压井开挖与支护方案研究

Overview of Excavation and Support Scheme for Surge Tank in Fully Weathered Stratum of Batang Toru Hydropower Plant

印度尼西亚巴塘水电站调压井所处位置地质条件较差,岩体以全风化地层为主,开挖阶段初期支护安全风险大。项目部经过多种方案对比,最终选择了“灌注桩+冠”、“环梁+锚喷”的支护方式。阐述了对全风化地层情况下调压井的开挖与支护采用的设计方案和施工方法进行的研究与实施,取得了较好的效果,所取得的经验可为后续类似工程施工时参考。

The surge tank of Batang Toru Hydropower Plant in Indonesia is mainly composed of completely weathered strata with poor geological conditions,and there is a high risk of support safety during the early excavation stage.After comparing multiple schemes,the final scheme is to use the support method of“bored pile+crown”,“ring beams+anchor”and shotcrete.This article introduces the excavation and support scheme and construction method of surge tank in completely weathered formation,providing a certain reference for the construction of similar projects in the future.