首页> 中文期刊> 《工程地质学报》 >基于可拓理论的高地应力隧道围岩分级法及应用

基于可拓理论的高地应力隧道围岩分级法及应用

         

摘要

随着大量深埋特长隧道的修建,地应力问题特别是高地应力问题对围岩分级的影响愈发突出.围岩分级是一个复杂的矛盾问题,目前常用的围岩分级方法是选取固定的几个指标,然后采用集商、求和等方式进行评分分级.但有些围岩分级计算方法不能根据实际地质情况灵活地选取分级指标,而且有些分级指标之间存在相关影响.可拓学理论可将矛盾问题转化为相容问题,是一种值得探索和运用的方法.本文将可拓理论方法与高地应力隧道围岩分级相结合,建立基于可拓理论的高地应力隧道围岩分级法.该方法主要是通过选取能够反映和体现围岩分级的各项重要参数指标——岩石单轴抗压强度Rc,RQD指标,岩石完整性指标Kv,地下水状态指标ω,特别是考虑了地应力值σ这项重要指标,然后在物元理论、可拓集合论和关联函数运算的基础上,建立了隧道围岩分级的物元模型;通过实际的隧道围岩级别关联度的计算,最终确定围岩级别.通过可拓理论围岩分级的实际应用表明,该方法在高地应力隧道围岩分级中具有较好的适用性.%As a large number of deep and long tunnel is being constructed, the geostress effects and especially the high geostress effects to surrounding rock classification becomes more and more challenging, at present, the common surrounding rock classification method is to select a few indicators, then to assign some values, then to make relevant classifications. Some surrounding rock classification method cannot flexibly choose the rock classification geological indexes. Some classification indexes can influence each other. The surrounding rock classification is a complicated problem of conflicting. The extension theory methods can be used to translate the conflicting problem into the exclusive problem. This method is worthy for exploration and use. This paper combines the extension theory methods withthe surrounding rock classification for high geostress tunnel. It establishes the method of rock classification for high geostress tunnel based on extension theory. The method mainly t selects the important parameters of rock classification indices that can reflect and embody the feature-uniaxial compressive strength Rc, RQD index, the index Kv of rockmass integrity, index ω of groundwater state. It especially considers the important index with geostress. It then bases on matter-element theory, extension set and dependent function calculation to establish the material element model of the surrounding rock classification. It follows the degree of association calculations for the actual rock classification. The final rock classification can determined, the paper applies the method to actual cases.

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