Deformation characteristics and engineering effect evaluation of a sandstone bedding excavation high slope treatment project during construction
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摘要:
为了研究砂岩顺层挖方高边坡支护工程施工期间及施工后的边坡变形规律和治理工程效果，文章依托北京某边坡支护项目，对边坡在施工过程中的锚索轴力及边坡位移进行监测分析，结果表明：锚索轴力变化主要分为加速损失阶段、波动阶段以及持续稳定趋变阶段；锚索轴力变化可以很好地反映坡体内力的变化情况；坡顶水平位移和竖向沉降的变化，可以反映边坡深层位移的变化规律和边坡的稳定性；框架预应力锚索抗滑桩组合支护体系应用于砂岩顺层挖方高边坡的支护时，具有较好的支护效果。采用有限元分析软件，模拟该砂岩顺层挖方高边坡的开挖支护过程发现：随着边坡的开挖，坡体位移沿着软弱滑动面向坡角发展，边坡稳定性降低。将监测结果与模拟结果对比分析，发现二者的变化趋势基本一致，证明了该边坡的支护体系能有效地控制边坡的变形。研究成果能为以后类似边坡的设计施工提供参考。
Abstract:In order to study the slope deformation law during and after the construction of the sandstone bed-cut high slope support project and the effect of the treatment project, this paper relies on a slope support project in Beijing to analyze the axial force of the anchor cable and the slope during the construction process. The slope displacement is monitored and analyzed, and the results show that the change of the axial force of the anchor cable is mainly divided into the acceleration loss stage, the fluctuation stage and the continuous stable trend stage; the change of the axial force of the anchor cable can well reflect the change of the internal force of the slope; the change of horizontal displacement and vertical settlement can reflect the change law of the deep displacement of the slope and the stability of the slope, has a better support effect. The finite element analysis software was used to simulate the excavation and support process of the sandstone-layered high slope. It was found that with the excavation of the slope, the displacement of the slope developed along the slope angle of the weak sliding surface, and the stability of the slope decreased. The monitoring results and the simulation results are compared and analyzed, and it is found that the change trends of the two are basically the same, which proves that the slope support system can effectively control the deformation of the slope. The research results can provide reference for the design and construction of similar slopes in the future.
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表 1 支护参数及说明
Table 1. Support parameters and description
坡级 锚索支护参数 八级坡 6Φ15.2，l=26 m，l锚=10 m，设计轴力672 kN 七级坡 6Φ15.2，l=28 m，l锚=10 m，设计轴力672 kN 六级坡 6Φ15.2， l=27 m，l锚=10 m，设计轴力672 kN 五级坡 6Φ15.2，l=22 m，l锚=10 m，设计轴力672 kN 四级坡 8Φ15.2，l=47.5 m， l锚=10 m，设计轴力672 kN 三级坡 8Φ15.2，l=34.5 m，l锚=10 m，设计轴力672 kN 二级坡 8Φ15.2，l=31 m，l锚=10 m，设计轴力672 kN 抗滑桩 8Φ15.2，l=41 m，l锚=10 m，设计轴力672 kN 
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表 2 场地土层主要物理力学参数
Table 2. The main physical and mechanical parameters of the soil layer of the site
材料名称 厚度
/m重度
/（kN·m−3）泊松比 黏聚力
/kPa内摩擦角
/（°）碳质砂岩 >80 27.2 0.25 18.0 38.0 滑面 / 24.5 0.30 11.0 28.0 薄弱面 / 20.0 0.25 12.0 30.0
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表 3 结构主要计算参数表
Table 3. Structure main calculation parameter table
参数 抗滑桩 自由段 锚固段 框架梁 重度
/（kN·m−3）25 67.60×106 39×106 25 弹性模量
/（kN·m−2）3.25×107 弹性模量与
截面的乘积为
1.42×105 kN2.06×108 3.25×107 尺寸 3 m×2 m 直径0.13 m 0.18 m×0.16 m
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表 4 具体施工步骤
Table 4. Specific construction steps
步骤 说明 工况1 初始地应力分析 工况2 八级坡开挖 工况3 八级坡施工框架预应力锚索 工况4 七级坡开挖 工况5 七级坡施工框架预应力锚索 工况6 六级坡开挖 工况7 六级坡施工框架预应力锚索 工况8 五级坡开挖 工况9 五级坡施工框架预应力锚索 工况10 四级坡开挖 工况11 四级坡施工框架预应力锚索 工况12 三级坡开挖 工况13 三级坡施工框架预应力锚索 工况14 二级坡开挖 工况15 二级坡施工框架预应力锚索抗滑桩施工 工况16 施工抗滑桩预应力锚索 工况17 开挖到坡底
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