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为分析锚拉桩与抗滑桩组成的桩锚支护对偏压隧道边坡的加固效果,以某软弱围岩隧道为背景,建立三维弹塑性有限元模型进行分析,重点分析了桩锚加固与无加固状态下的边坡剪应变,水平与竖直位移,坡底抗滑桩轴力。结果表明,坡体剪应变在岩层交界面上最大,桩锚加固使得边坡的剪应变减小了42.8%;右线隧道拱脚的水平位移最大,桩锚加固使得边坡“U”形区范围明显缩小;竖直位移随着岩层深度的增加逐渐减小,桩锚加固使得坡底到坡中心的竖直位移减小了63%;桩锚加固状态下,坡底靠近临空面的抗滑桩轴力最小,其余抗滑桩轴力大小接近。
In order to analyze the effect of pile-anchor supporting composed of anchorage pile and anti-slide pile on the reinforcement of bias tunnel slope, a three-dimensional elasto-plastic finite element model is established based on a weak surrounding rock tunnel. Shear strain, horizontal and vertical displacement, and anti-slide pile axial force at the slope without reinforcement. The results show that the shear strain of slope is the largest at the interface of rock strata, and the shear strain of slope is reduced by 42.8% due to the reinforcement of pile and anchor. The horizontal displacement of arch foot of right tunnel is the largest, The range of the shape area is obviously reduced; the vertical displacement decreases with the increase of rock depth, and the vertical displacement of the slope bottom to the center of the slope is reduced by 63% due to the reinforcement of pile anchors; Of the anti-slide pile axial force minimum, the rest of the anti-slide pile axial force close to the size.