偏压隧道边坡桩锚支护加固效果的数值分析

发布时间：2019-03-27 19:34

【摘要】：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。
[Abstract]:In order to analyze the reinforcement effect of anchor-pull pile and anti-slide pile on the slope of biased pressure tunnel, a three-dimensional elastoplastic finite element model was established to analyze the slope of a weak surrounding rock tunnel. The shear strain, horizontal and vertical displacement, and axial force of anti-slide pile at the bottom of the slope under the condition of pile anchor reinforcement and non-reinforcement are analyzed emphatically. The results show that the shear strain of the slope is the largest at the rock interface, and the shear strain of the slope is reduced by 42.8% because of the reinforcement of the pile anchor, the horizontal displacement of the arch foot of the right tunnel is the largest, and the area of the "U" shape area of the slope is obviously reduced by the reinforcement of the pile anchor. The vertical displacement decreases gradually with the increase of rock depth, and the vertical displacement from the bottom to the center of the slope decreases by 63%, and the axial force of the anti-slide pile near the empty surface is the smallest under the condition of pile anchor reinforcement, while the axial force of the other anti-slide piles is close to that of the other anti-slide piles.
【作者单位】：长安大学公路学院;
【基金】：陕西省社会发展攻关项目,项目编号2016SF-412
【分类号】：U455.7

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