论文部分内容阅读
以实测的围岩蠕变变形资料为基础,基于现场监测所获得的蠕变本构模型,对某一矿区泥岩体的力学参数进行了弹塑性反演分析,得到的巷道围岩体基本力学参数分别为弹性模量E=2.0 GPa,凝聚力c=1.31 MPa,内摩擦角φ=24o。待反演参数水平均值的极差结果显示,通过极差的大小可以判断岩土力学参数的敏感性,对蠕变的影响而言,凝聚力最敏感,其次是内摩擦角,弹性模量再次之。在此基础上,利用反演所得的围岩基本力学参数进行了正演,计算得到了各测点处对应的蠕变位移增量,与实测值相比吻合较好,表明反分析所获得的岩体材料参数综合反映了巷道围岩的力学特性。最后,对巷道围岩变形大小及塑性区范围进行了预测。
Based on the measured creep deformation data of surrounding rock, based on the creep constitutive model obtained from on-site monitoring, the mechanical parameters of mudstone in a mining area are elastically and inversely analyzed, and the basic mechanics parameters Respectively elastic modulus E = 2.0 GPa, cohesion c = 1.31 MPa, internal friction angle φ = 24o. The very poor results of the horizontal mean of the parameters to be inverted show that the sensitivity of the geotechnical parameters can be judged by the magnitude of the difference, the cohesion is the most sensitive to the effect of creep, followed by the internal friction angle, and the modulus of elasticity again . On this basis, the basic mechanical parameters of the surrounding rock obtained by the inversion were forward-calculated, and the increment of creep displacement at each measuring point was calculated, which is in good agreement with the measured value, indicating that The parameters of rock mass synthetically reflect the mechanical characteristics of the surrounding rock. Finally, the deformation size and plastic zone range of surrounding rock are predicted.