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重庆地区土岩基坑随处可见,在涉及这类基坑的稳定性计算时,设计者往往强调的是整个基坑开挖面岩土体的稳定性,却忽视了基坑岩层以上土体的稳定性。针对此种情况,推导出了这类地质条件下的基坑在采取垂直开挖或放坡时,上层土体沿某一平面滑动的稳定性计算模式,并提出了土岩交界处以上土体稳定性的判别标准,以及可以采取的相应施工措施。通过工程实例与理论计算的对比分析,证明了此种判别标准和施工措施不仅能保证基坑的稳定性,同时也有利于降低工程造价,为今后类似工程提供有益的借鉴。
When the stability of such foundation pit is involved in calculation, the designers often emphasize the stability of the rock and soil mass in the excavation face of the whole foundation pit while ignoring the soil above the foundation pit stability. In view of this situation, the stability calculation mode of the upper soil sliding along a certain plane when the excavation or the vertical excavation of the foundation pit under such geological conditions is taken is deduced, and the soil above the junction of the earth and rock is proposed The criterion of stability, and the corresponding construction measures that can be taken. Through the comparative analysis of engineering examples and theoretical calculations, it is proved that such criteria and construction measures can not only ensure the stability of foundation pit, but also help to reduce construction cost and provide useful reference for similar projects in the future.