青山水库输水工程石膏岩洞段支护衬砌设计方案优化研究

Study on Optimization of Support Lining Design Plan for Gypsum Cave Section in Qingshan Reservoir Water Conveyance Project

新奥法施工需要充分利用围岩的自我承载力,对自我承载力较差的洞段实施比较困难。文章以青山水库输水工程石膏岩施工段为例,对开挖施工过程中的支护衬砌原方案进行优化调整,提出优化设计方案,利用数值模拟的方法进行优化方案的安全性分析,结果显示:优化设计方案下的围岩安全系数完全满足评价标准要求。

The self-bearing capacity of surrounding rocks should be fully utilized in the construction of New Austrian Tunneling Method, and it is difficult to implement the tunnel section with poor self-bearing capacity. Qingshan Reservoir Water Conveyance Project gypsum rock construction is adopted as an example in the paper. The support lining original plan in the excavation construction is optimized and adjusted. An optimization design plan is put forward. The method of using numerical simulation is utilized for analyzing the safety of the optimization plan. The results show that the surrounding rock safety coefficient under the optimization design plan fully meets the requirements of evaluation standards.