露天矿排土场软弱基底极限承载力分析

Analysis on ultimate bearing capacity of weak foundation in open pit mine

为了研究基底厚度对基底极限承载力的影响,以露天铁矿外排土场为工程背景,推导出考虑基底厚度的基底极限承载力理论公式,并通过FLAC^(3D)对公式计算结果进行验证。研究结果表明:该软弱基底排土场基底的破坏方式为"坐落-滑移式"破坏,基底极限承载力与基底厚度的关系为负相关;由FLAC^(3D)计算的基底极限承载力与推导出的理论公式的计算结果误差约3%,满足工程规定的要求。该研究成果对计算不同基底厚度基底极限承载力具有借鉴意义。

In order to research the influence of foundation thickness on ultimate bearing capacity of foundation, we take an open pit iron mine as engineering background, the theoretical formula for ultimate bearing capacity of foundation on considering foundation thickness is established and verified by FLAC^3D. The results show that this waste dump foundation failure mode is ＂located -sliding＂, the ultimate bearing capacity of foundation is negatively correlated with weak foundation thickness. The dropping amplitude of ultimate bearing capacity of foundation decreases gradually with foundation thickness increasing. The caleulation result error of ultimate bearing capacity of foundation between FLAC^3D and the theoretical formula is about 3%. The results meet engineering requirements and prove that the theoretical formula is correct. The research results can be used to calculate ultimate bearing capacity of foundation with different thickness.