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为明确开挖地基岩体所处环境湿度干湿交替作用对其力学特性损伤劣化作用,设置4种工况8组方案共24试样,探究了泥质粉砂岩在此因素下的变形规律及模量损伤程度。结果表明,与开挖初始状态相比,当环境湿度干湿循环变化时,泥质粉砂岩受荷变形显著增大,且其塑性变形比例增大,变形模量及永久变形模量显著降低。泥质粉砂岩岩体模量受干湿循环作用损伤劣化的程度,取决于不同应力状态塑性变形增量大小,其塑性变形增量与干湿循环次数符合对数变化规律。将岩体塑性变形增量作为干湿循环作用下岩体力学性质损伤变量,当采用刚性承压板法测定岩体模量时,建议将损伤变量、变形模量与永久变形模量相结合来评价环境湿度干湿作用对红层地基岩体模量损伤规律。
In order to clarify the role of wet and dry alternation of wet and dry environment in excavation of ground rock mass on the deterioration of mechanical properties, 24 samples of 8 working conditions and 8 conditions were set up to study the deformation law of the muddy siltstone under this factor. Modulus damage degree. The results show that compared with the initial state of excavation, when the humidity and wetting cycles of environmental humidity change, the load of argillaceous siltstone increases significantly, and the proportion of plastic deformation increases, and the deformation modulus and permanent deformation modulus decrease significantly. The extent to which the modulus of the muddy silt rock mass is damaged by the wetting and drying cycles depends on the amount of plastic deformation increment at different stress states. The plastic deformation increment and the number of wet-dry cycles conform to the logarithmic change rule. Taking the increase of plastic deformation of rock mass as the damage variable of rock mass under wetting and drying cycles, it is suggested to combine the damage variable, deformation modulus and permanent deformation modulus Evaluation of wetting and dampness effect of environmental humidity on the rock mass modulus damage of red beds.