洞室围岩质量多因素模糊综合评价模型及应用

FUZZY COMPREHENSIVE ASSESSMENT MODEL WITH SEVERAL INFLUENTIAL FACTORS FOR QUALITY OF TUNNEL ROCK AND ITS APPLICATION

由于洞室围岩质量及其影响因素的复杂性和不确定性,以往采用定指标、定权重的评价方法不尽合理,因此,有必要建立一多因素模糊评价模型。首先,应用模糊数学方法,建立了考虑岩石的单轴抗压强度σc,RQD指标,结构面间距J1,结构面摩擦系数f和岩体的声波速度V的多因素洞室围岩综合评价模型;然后,以地下洞室围岩为工程背景,对岩体质量进行了模糊综合评价,结果表明:模糊评价方法适用于不同岩体工程,能最大限度地利用工程勘察成果,是解决多因素、多指标综合问题的有效决策方法。得到的结果与可拓学评价法以及RMR法得到的结果大致相同,符合实际情况,说明多因素综合评价模型的正确性。

The tunnel rock quality and its influential factors are very complicated and uncertain. And the assessments used before with fixed index and fixed weight are not reasonable. So it is necessary to build a fuzzy assessment model which can consider several influential factors. Firstly, by using fuzzy mathematic method, based on the single factor comprehensive assessment method, a six factors comprehensive model are founded for the tunnel rock. This model contains six factors, namely uniaxial compressive strength of rock o＇c, RQD index, interval J1 between joint plane, roughness coefficientfof joint plane surfaces, and acoustic wave velocity V in rock mass. Secondly, rock mass in one underground is chosen as the engineering background. The fuzzy comprehensive assessment is done to the rock mass in seven sections of this tunnel. The result of assessment shows that, fuzzy assessment method is suitable for different rock mass engineering, it can make use of resource from engineering geological investigation at the largest degree. Fuzzy assessment method is a good way to solve the problem with several factors and several index. The results obtained for the project by fuzzy assessment method is in good agreement with that from extenics theory and RMR theory, which is in accordance with the pratical situation, so the comprehensive assessment model built in this paper is correct.