基于非线性Mohr-Coulomb破坏准则的浅埋倾斜条形锚板抗拔承载力预测

针对浅埋倾斜布置条形锚板抗拔承载力计算问题,采用非线性Mohr-Coulomb破坏准则,构造了极限上拔荷载作用下锚板上方土体的非对称曲线型破坏机制,并利用极限分析上限法与变分原理,导出了浅埋倾斜条形锚板极限抗拔力和土体破裂曲线的理论解析解。在此基础上,分析得到了埋深比、布设倾角、非线性系数、初始粘聚力、土体重度和地面超载等参数对锚板极限抗拔力和土体破裂范围的影响规律,并将结果和现有研究成果进行了对比分析,进一步验证了理论方法的有效性。研究表明,锚板倾角和土体非线性系数对倾斜条形锚板极限抗拔力和土体破裂范围影响较为显著,在工程设计及施工中应予以足够重视。

Prediction of Uplift Capacity of Shallow-Buried Inclined Strip Anchor Plate Based on Nonlinear Mohr-Coulomb Failure Criterion

Aiming at the calculation problem of the uplift bearing capacity of the strip anchor plate with shallow buried inclined arrangement, the nonlinear Mohr-Coulomb failure criterion is used to construct the asymmetric curve failure mechanism of the soil above the anchor plate under the ultimate uplift load, The upper limit method of limit analysis and the variational principle have derived theoretical analytical solutions for the ultimate pull-out resistance of the shallow-buried inclined strip anchor plate and the rupture curve of the soil. On this basis, the analysis has obtained the influence law of buried depth ratio, layout inclination angle, nonlinear coefficient, initial cohesion, soil unit weight and ground overload on the ultimate pull-out resistance of the anchor plate and the rupture range of the soil. The results are compared and analyzed with the existing research results, further verifying the effectiveness of the theoretical methods. Studies have shown that the inclination angle of the anchor plate and the nonlinear coefficient of soil have a significant influence on the ultimate pull-out resistance of the inclined strip anchor plate and the rupture range of the soil, and sufficient attention should be paid in engineering design and construction.