岩溶隧道衬砌水压力分布统计分析及模糊评价

Statistical Analysis and Fuzzy Synthetic Evaluation of Water Pressure Load on Lining of Karst Tunnel

对国内典型岩溶隧道衬砌水压力实测数据进行统计,分析衬砌水压力的影响因素,主要包括:地质构造、围岩渗透性、岩溶水补给、岩溶水排泄和岩溶水垂直分带.基于实测数据研究不同防排水方式下衬砌水压力的分布规律,全排水设计时衬砌水压力很小,全封堵设计时衬砌水压力几乎等于静水压力,释能降压处理能大幅度降低衬砌水压力,堵水限排设计可通过控制排水量以降低衬砌水压力.在衬砌水压力实测数据统计分析的基础上,建立隧道水压力模糊综合评价体系,根据水压力模糊评价结果,对隧道防排水方式的选择提出建议.

Based on the statistical analysis of water pressure load on tunnel lining, the main influencing factors of water pressure are analyzed. The main control ingredients are geological structure, rock permeability, the supply and drainage of Karst water,vertical zonation of Karst water. The population distribution characteristics of water pressure on liner are also studied with different drainaged designs. A large number of drainage leads to a small water pressure on lining. When full-sealing water proofing lining is employed, the water pressure on lining is equal to hydrostatic pressure. When Karst water is released, the water pressure can be reduced sharp- ly. The water pressure on lining can be weakened by controlled drainage design. Based on the statistics of data measured in field, a fuzzy synthetic evaluation system of water pressure is established. According to the evaluation results of water pressure, reasonable choice of different drainage patterns can be acquired.