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为了验算虎跳峡大桥丽江岸重力锚在主缆拉力作用下的稳定性,对锚碇区的岩体进行了室内试验以及现场载荷试验和直接剪切试验,根据试验结果运用静力学分析和有限元软件验算重力锚的稳定性,结合灵敏度分析的方法研究影响重力锚稳定性各因素如弹性模量、粘聚力、内摩擦角、泊松比和密度以及主缆拉力的大小、重力锚基础与地基之间的粘聚力的灵敏度大小。研究表明:在主缆拉力作用下,静力学分析得到重力锚的抗滑动稳定性系数、抗倾覆稳定性系数均满足规范的要求,基底应力小于地基容许承载力的要求;有限元软件计算得到重力锚的水平位移和沉降均小于规范允许值,地基应力小于地基容许承载力的要求;灵敏度分析结果显示,重力锚水平位移对主缆拉力的灵敏度最大,锚碇的沉降对弹性模量的敏感程度最大。
In order to verify the stability of the Lijiang Gorge Bridge under the action of the main cable tension, the rock mass in the anchorage zone has been subjected to laboratory tests as well as field load tests and direct shear tests. According to the experimental results, the static analysis and finite Meta-software to check the stability of gravity anchor, combined with sensitivity analysis method to study the various factors that affect the stability of gravity anchor such as elastic modulus, cohesion, internal friction angle, Poisson’s ratio and density, as well as the size of the main cable pull, The sensitivity of the cohesion between the foundation and the size. The results show that under the action of main cable tension, the statistic analysis shows that both the anti-sliding stability coefficient and anti-overturning stability coefficient of gravity anchor meet the requirements of the code, and the stress of foundation is less than the allowable bearing capacity of foundation. The finite element software calculates the gravity The horizontal displacement and settlement of the anchor are both less than the allowable values of the standard, the foundation stress is less than the allowable bearing capacity of the foundation. The sensitivity analysis shows that the horizontal displacement of the anchor is the most sensitive to the cable tension and the sensitivity of the anchorage to the elastic modulus maximum.