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通过大型物理模拟试验和有限差分(FLAC3D)模拟,研究了黄土滑坡微型桩群桩破坏模式。现场试验及数值模拟结果表明,微型桩易发生破坏的区域为滑面上下各4倍桩径范围内,且其破坏形式以弯剪破坏为主;微型桩上滑坡推力的分布形式近似为三角形,推力在滑面处达到最大值;滑坡推力沿荷载传递方向依次递减;微型桩群桩的弯矩分布形式有别于传统抗滑桩,弯矩最大值出现在滑面附近。其成果为微型桩的研究与应用提供了理论基础。
Through large-scale physical simulation experiments and finite difference (FLAC3D) simulation, the failure mode of the mini-pile groups in loess landslide has been studied. Field tests and numerical simulations show that the area prone to failure of micro-piles is within 4 times of the pile diameter at the top and bottom of the slip surface, and the failure mode is dominated by shear and shear failure. The distribution of the thrust on the micro pile is approximately triangular, The thrust reaches the maximum at the slip surface; the thrust of the landslide decreases in turn along the load transfer direction; the distribution of bending moment of the mini pile group pile is different from that of the traditional anti-slide pile, and the maximum bending moment appears near the sliding surface. The results provide a theoretical basis for the research and application of micro-piles.