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路堤临界填土高度是公路工程中一个非常重要的问题,填筑高度小于临界填土高度时,地基的变形和稳定能得到控制。依据极坐标表示的弗拉曼公式和统一强度理论,考虑中间主应力2对地基承载力的影响,推导出土的静止侧压力系数K0≠1条件下地基的临塑与临界荷载公式,提出路堤临界填土高度一种计算方法。结合算例,对中间主剪应力系数b和土的静止侧压力系数K0取不同值时,临界荷载与路堤临界填土高度计算结果进行了对比分析,结果表明:基于统一强度理论得到的计算方法能确切地反映地基承载力的实质,使地基土体强度得到充分的发挥。
The critical height of embankment is a very important issue in highway engineering. When the height of embankment is less than the critical height of embankment, the deformation and stability of foundation can be controlled. Based on the Polarman formula and the unified strength theory expressed by polar coordinates, the influence of intermediate principal stress 2 on the bearing capacity of foundation is considered, and the plastic and critical load formula of the foundation under unconfined lateral pressure coefficient K0 ≠ 1 is deduced. A calculation method of filling height. The calculation results of the critical load and the critical embankment height of the embankment are compared with the example when the intermediate main shear stress coefficient b and the soil static lateral pressure coefficient K0 are taken as different values. The results show that the calculation method based on the unified strength theory Can accurately reflect the essence of the bearing capacity of the foundation so that the strength of the foundation soil can be fully demonstrated.