放坡法开挖基坑整体稳定性的研究

Study on the overall stability of foundation pit by step-slope excavation

为使18 m的深基坑釆用自然放坡法顺利实施,专门研究了地下水位的影响,分析了设置抗滑桩的作用。使基坑顶面以下34 m范围内整体滑动稳定性计算所有滑弧的安全系数均满足规程要求。为了仍可应用理正基坑软件进行整体稳定性计算,用替代土层代替竖向增强体。经过验算证明了复合抗剪强度法计算抗滑桩比传统方法、英国BS 8006:1995等方法更接近实际情况。

In order to make the 18 m deep foundation pit to adopt the natural step-slope excavation method,the effects of groundwater level and setting of anti-slide pile have been studied and analyzed.All the safety factors of sliding circles have been calculated within the scope of34 m below the top surface of the foundation pit in order to meet the specification requirements.Thus,the vertical reinforcement in this report was replaced with an alternative soil layer so that the Lizheng foundation p社software should be used for the overall stability calculation.Hence,proving that the composite shear strength method is close enough to the actual situation than both the traditional method and the British BS 8006:1995 method.