高陡黄土边坡多级有限填土加筋土-框锚组合体系抗滑分析

针对黄土滑塌高边坡治理加固中的空间受限、高填方填筑及水平位移变形等问题,提出了多级有限填土加筋土-框锚组合体系;目前对其抗滑稳定分析鲜有研究。依托陕西铜川某高陡边坡为背景,通过利用有限元数值计算和现场监测、测试,分析了该组合体系抗滑作用效果。结果表明:随着支护结构的逐步施加对边坡位移控制明显,锚索轴力变化具有一定的规律性。锚索自由段轴力最大,锚固段轴力变化曲线呈下凹型,向尾部方向逐渐变小,端部接近零;锚索应力对坡体内部变形敏感程度较高,锚索对坡体位移控制起到关键作用。有限加筋土-框锚组合体系协同作用下,框架锚索提供抗滑力约占总抗滑力的62. 73%,有限加筋土挡墙提供抗滑力约占总抗滑力的37. 27%,框架锚索与有限加筋土分担下滑力比值为1. 68∶1。有限填土加筋土与框架锚索组合柔性支挡结构可以有效治理黄土滑塌高边坡病害,实现了预期的抗滑设计效果。研究结果为中国范围内同类高陡边坡治理提供有益的参考,为拓展边坡与地质灾害治理方式和理论提供基础依据。

Anti-slide Analysis on Composite System of Multi-stage reinforced Soil with Limited backfill and Frame Foundation Beam with Anchor Cable on high-steep loess slope

Aiming at the problem of high backfill filling and horizontal deformation in the treatment and reinforcement of loess sliding high slope, a composite system of reinforced soil with limited backfill and anchor frame beam is proposed.At present, the anti-slide stability analysis is rarely studied. Based on a high-steep slope in Tongchuan, Shaanxi Province, this paper analyzes the the anti-slide effect of the combined system in the treatment of loess slump high slope by using finite element numerical calculation and on-site monitoring and testing, The results show that with the gradual application of the supporting structure, the displacement control of the slope is obvious, and the axial force change of the anchor cable has certain regularity. The axial force of the free section of the anchor cable is the largest, and the axial force variation curve of the anchorage section is concave, gradually becoming smaller toward the tail, and the end is close to zero.The anchor cable stress is sensitive to the internal deformation of the slope, and the displacement control of the anchor cable to the slope play a key role.The composite system of