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岩石具有蠕变效应,对砂岩和泥岩岩样分别进行蠕变试验和松弛试验,采用广义Kelvin模型对试验数据作拟合,得到两类岩石在不同压力水平下的蠕变参数,采用有限元程序对重庆地区典型的泥、砂岩互层边坡作数值分析,考虑了边坡开挖卸荷影响区的岩层蠕变效应,分析结果表明,由于泥岩层的剧烈蠕变,支挡锚杆轴力随时间变化明显,最上排锚杆轴力增加幅度达132%,坡顶向外位移也显著增大,建议今后边坡支挡设计时对于上部支挡力增大,对上部尤其第一排锚杆重点加强,加强方法是增加配筋和增大锚固长度。
The rock has creep effect. The creep test and relaxation test of sandstone and mudstone are respectively carried out. The generalized Kelvin model is used to fit the experimental data. The creep parameters of two types of rock under different pressure levels are obtained. The finite element program Based on the numerical analysis of the typical mud and sandstone interbedded slope in Chongqing, the creep effect of rock strata in the area affected by the excavation of the slope is considered. The analysis results show that due to the severe creep of mudstone, With the obvious change over time, the axial force of the uppermost bolt increases by 132% and the outward displacement of the top of the slope also increases significantly. It is suggested that the support force of the upper part will increase for the upper part in the future, Pillar emphasis to strengthen the strengthening method is to increase the reinforcement and increase the length of the anchor.