论文部分内容阅读
天然膨胀土经历长期干湿循环,反复胀缩使其具有多裂隙性和超固结性。在膨胀土边坡稳定分析中,应考虑上述性质的共同作用对边坡稳定性的影响。采用FLAC3D中的双线性应变硬化/软化遍布节理模型,对不同裂隙面位置和土体软化效应共同影响下的膨胀土边坡进行了稳定性分析。结果表明:裂隙面的存在会显著降低膨胀土边坡的稳定性。随着裂隙面与水平正向夹角的减小,边坡安全系数呈现出“增—减—增—减—增”的波形关系,峰值安全系数出现在20°和115°,谷值安全系数出现在80°和160°。考虑在裂隙面位置和土体软化效应的双重影响下,边坡稳定性会进一步降低,其中土体软化效应对边坡稳定性的影响要小于裂隙面的影响。反倾向小倾角的裂隙面一定程度上可提高边坡的整体稳定性,其与裂隙面的强度参数及土体的软化效应密切相关。
Natural expansive soil undergoes long-term wet-dry cycles, repeated expansion and contraction to make it more than fracture and super-consolidation. In the stability analysis of expansive soil slope, the influence of the above-mentioned properties on the slope stability should be considered. The bilinear strain hardening / softening all-joint model in FLAC3D was used to analyze the stability of expansive soil slope affected by the location of different fracture surfaces and soil softening effect. The results show that the existence of fracture surface can significantly reduce the stability of expansive soil slope. With the decrease of the included angle between the fracture surface and the horizontal, the slope safety factor shows a waveform relationship of “increase-decrease-increase-decrease-increase” and the peak safety factor appears at 20 ° and 115 °. The safety factor appears at 80 ° and 160 °. Under the dual influence of crack location and soil softening effect, the slope stability will be further reduced, and the effect of soil softening effect on the slope stability is less than that of the fracture surface. The inclined plane with small dip angle can improve the overall stability of the slope to a certain degree, which is closely related to the strength parameters of the fracture surface and the softening effect of the soil.