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临界填土高度是高速公路工程中一个非常重要的问题,当路堤施工期填筑高度小于临界填土高度时,路堤的施工期稳定就能得到保证,因此,临界填土高度的研究对高填方路基的设计与施工具有重要的理论意义与实用价值。基于统一双剪强度理论,对路基的施工期稳定性评价方法进行了探讨与分析,并给出了考虑中主应力影响下的路基临界填土高度的计算公式。采用该方法对京珠高速公路某合同段高填方路基临界填土高度进行了实例分析计算,并对基于统一双剪强度理论和Mohr-Coulomb准则的临界填土高度计算结果进行了对比分析。
The critical height of embankment is a very important issue in highway engineering. When the embankment construction height is less than the critical height, the embankment construction period can be guaranteed. Therefore, The design and construction of square embankment has important theoretical significance and practical value. Based on the unified double-shear strength theory, the stability evaluation of subgrade during construction period is discussed and analyzed, and the formula for calculating the critical subgrade fill height under the influence of main stress is given. This method is used to analyze and calculate the critical fill height of high embankment in a contract section of Beijing-Zhuhai Expressway, and the comparative analysis of critical fill height based on the unified double-shear strength theory and Mohr-Coulomb criterion is carried out.