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考虑到传统浅埋偏压隧道围岩压力的分析仅以计算摩擦角体现围岩材料特性,没有将内摩擦角和黏聚力作为独立参数分开研究,基于规范法,提出水平地震作用下独立考虑黏聚力的浅埋偏压隧道围岩压力的简化解析分析方法,获得隧道顶部竖直围岩压力、隧道两侧水平侧压力以及滑动面破裂角的理论表达式,并对影响顶部竖直围岩压力、水平侧压力和破裂角的因素进行了研究。结果表明,竖直围岩压力与滑裂面摩擦角、地面倾角呈正相关,与水平地震效应系数、滑裂面黏聚力呈负相关;滑裂面内摩擦角、黏聚力、地面倾角越大,破裂角越大,水平地震加速度系数越大,破裂角越小;水平侧压力随滑裂面内摩擦角和黏聚力的增大而减小,随水平地震效应系数和地面倾角的增大而增大。研究成果可为浅埋偏压隧道的围岩应力计算提供一定的理论依据。
Considering that the analysis of surrounding rock pressure in conventional shallowly buried tunnels only takes into account the fact that the friction angle reflects the characteristics of surrounding rock material, the internal friction angle and cohesion are not separately studied as independent parameters. Based on the normalized method, Cohesion of shallow buried tunnel pressure in the simplified analysis and analysis method to obtain the vertical tunnel top of the tunnel pressure on both sides of the horizontal side of the pressure and sliding surface rupture angle of the theoretical expression and the impact of the vertical top of the Wai Rock pressure, horizontal pressure and fracture angle were studied. The results show that the pressure of vertical surrounding rock is positively correlated with the slip angle and the dip of the slip surface, and negatively correlates with the horizontal seismic effect coefficient and the cohesion of the slip surface. The internal friction angle, cohesion and ground inclination of the slip surface The bigger the rupture angle is, the larger the horizontal seismic acceleration coefficient is, and the smaller the rupture angle is. The horizontal pressure decreases with the increase of the internal friction angle and cohesion of the slip plane. With the increase of horizontal seismic effect coefficient and ground inclination Big and big. The research results can provide a theoretical basis for the calculation of surrounding rock stress of shallow buried tunnels.