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比较了土钉支护与纯土坡在稳定分析方面的不同。结合土钉支护边开挖边支护的特点,分析了施工阶段土钉轴力增量与土钉支护内部整体稳定性的关系,给出了c-ψ-τ强度折减法计算土钉支护内部整体稳定性安全系数的方法,该方法除考虑一般土坡稳定分析中对c及ψ的降低外,还考虑土钉工作内力的变化及其对抗滑的贡献,以及钉土之间相互作用程度的降低。采用该方法,对Clouterre项目1号墙浸水破坏时的内部稳定安全系数进行了计算,计算结果与TALREN程序一致。分析表明,c-ψ-τ强度折减法可用于计算土钉支护施工阶段、使用阶段和破坏阶段的内部整体稳定性安全系数。
The differences in stability analysis between soil nailing and pure soil slope are compared. Combined with the characteristics of excavation and side support of soil nailing, the relationship between the increment of soil nailing axial force and the overall stability of soil nailing during construction was analyzed. The c-ψ-τ strength reduction method was used to calculate the soil nailing. The method of supporting the overall internal stability safety factor, which takes into account the changes in the internal forces of the soil nailing and the contribution to the anti-slip, in addition to the reduction in c and enthalpy in the general stability analysis of the soil slope, and the interaction between soil and soil. The degree of effect is reduced. Using this method, the internal stability safety factor of the No. 1 wall of the Clouterre Project was calculated. The calculation results are consistent with the TALREN program. The analysis shows that the c-ψ-τ strength reduction method can be used to calculate the internal overall stability and safety factor in the construction phase, service phase and destruction phase of soil nailing.