Reinforcement of Anti-pulling Bolts in Ultra-high Gravity Retaining Wall
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摘要: 通过在超高挡土墙中安装水平抗拔锚杆和抗滑块,从而降低挡土墙的截面积。这种加筋方式可以有效地减轻主动土压力。当布置不同形式的抗拔锚杆和抗滑块时,墙后土体应力分布产生大幅的影响,对其水平应力和水平位移进行了数值分析。根据某工程实际情况,计算得出挡土墙背部土体在不同工况下的水平方向应力和位移大小,以验证其安全性,达到减少土体压力的目的。结果表明,在超高挡土墙中,采用3层抗拔锚杆和每层抗拔锚杆上安装2个抗滑块的加筋方式,对挡土墙墙后土体的预加固,增加墙后土体的自身稳定性,削减墙后土体对挡墙的土压力,可以获得最佳的加筋效果。Abstract: By installing horizontal anti-pulling bolts and anti-sliders in ultra-high retaining walls, the cross-sectional area of the retaining wall can be reduced. This reinforcement method can effectively reduce the active earth pressure. When different forms of anti-pulling bolts and anti-sliders were arranged, the stress distribution of soil behind the wall had a large impact, and the horizontal stress and horizontal displacement were numerically analyzed. According to the actual situation, the horizontal stress and displacement of the soil behind the gravity retaining wall under different working conditions were calculated to verify its safety and achieve the purpose of reducing the soil pressure. The results show that in the ultra-high gravity retaining wall, the best reinforcement effect can be obtained by using 3 layers of anti-pulling bolts and 2 anti-sliders on each layer of anti-pulling bolts. The pre-reinforcement of the soil behind the retaining wall should increase the stability of the soil behind the wall, and reduce the soil pressure of the soil behind the wall to the retaining wall.
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Key words:
- retaining walls /
- anti-pulling bolts /
- anti-slider /
- pre-reinforcement /
- numerical simulation
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表 1 土层物理力学指标
土层编号 弹性模量
E/MPa重度
γ/(kN·m−3)泊松比
μ黏聚力
c/kPa内摩擦角
φ/(°)1 4.67 18 0.3 12 10 2 6.11 19.7 0.43 25 13 3 20.00 22.5 0.3 55 40 表 2 模型材料计算参数取值
材料 变形模量E/MPa 泊松比μ 重度γ/(kN·m−3) 抗滑块 28000 0.25 25 抗拔锚杆 200000 0.2 25 岩体 300 0.35 20 挡土墙 28000 0.25 25 表 3 A1断面与A2断面水平应力对比、水平位移对比
A1深度/
mA1水平
应力/PaA1水平
位移/mmA2深度/
mA2水平
应力/PaA2水平
位移/mm0.00 −7719.40 −2.58 0.00 −6717.24 −2.22 0.68 −10314.02 −2.18 0.66 −7606.80 −1.86 1.44 −16028.13 −1.99 1.39 −10584.25 −2.30 1.65 −18231.29 −2.28 1.81 −16312.91 −2.20 2.17 −17385.55 −3.34 2.28 −16985.97 −3.05 2.71 −18673.04 −3.42 2.76 −17188.64 −3.07 3.16 −21708.82 −3.99 3.25 −19667.63 −3.89 3.55 −23039.99 −4.69 3.46 −20936.13 −4.15 3.78 −25471.31 −7.42 3.96 −20398.46 −3.52 4.24 −22567.47 −6.01 4.49 −20293.93 −2.36 4.75 −19558.71 −5.89 4.94 −22649.93 −2.28 5.29 −19244.13 −6.64 5.34 −24523.80 −2.70 5.87 −21958.88 −7.72 5.59 −14651.56 −5.60 6.45 −25449.46 −8.51 6.06 −14128.18 −2.49 6.98 −27291.36 −8.83 6.69 −14867.50 −2.16 表 4 B1断面与B2断面水平应力对比、水平位移对比
B1深度/
mB1水平
应力/PaB1水平
位移/mmB2深度/
mB2水平
应力/PaB2水平
位移/mm0.00 −864.88 −8.24 0.00 −871.03 −7.54 1.00 −5143.01 −7.96 1.00 −4547.70 −6.45 2.00 −4605.90 −6.67 2.00 −2665.10 −5.35 3.00 −7834.41 −6.37 3.00 −7095.25 −5.24 4.00 −6959.27 −7.07 4.00 −5527.93 −5.84 5.00 −9032.81 −7.77 5.00 −3996.38 −6.02 6.00 −12603.1 −8.36 6.00 −5035.87 −6.51 表 5 C1断面与C2断面水平应力对比、水平位移对比
C1结点
深度/mC1水平
应力/PaC1水平
位移/mmC2结点
深度/mC2水平
应力/PaC2水平
位移/mm0.00 −10289.09 −1.42 0.00 −12081.99 −1.09 0.48 −8550.32 −1.66 0.48 −9488.07 −1.43 0.76 −10052.44 −1.86 0.77 −8462.41 −1.56 0.98 −12237.35 −1.58 1.07 −11846.11 −1.06 1.20 −16378.70 −2.51 1.27 −13335.44 −1.47 1.44 −17615.77 −2.79 1.51 −15279.62 −2.04 1.86 −17038.36 −2.72 1.84 −16438.31 −2.48 表 6 A2断面与A3断面水平应力对比、水平位移对比
A2深度/
mA2水平
应力/PaA2水平
位移/mmA3深度/
mA3水平
应力/PaA3水平
位移/mm0.00 −6717.24 −2.22 0.00 −9033.88 −2.02 0.66 −7606.80 −1.86 0.64 −9822.38 −1.37 1.39 −18584.25 −2.30 1.06 −14092.06 −1.96 1.81 −16312.91 −2.20 1.37 −12491.60 −1.30 2.28 −16985.97 −3.05 1.79 −9563.09 −1.57 2.76 −17188.64 −3.07 2.27 −10016.24 −1.37 3.25 −19667.63 −3.89 2.79 −12833.07 −1.14 3.46 −20936.13 −4.15 2.99 −13707.99 −1.54 3.96 −20398.46 −3.52 3.33 −14995.21 −1.22 4.49 −20293.93 −2.36 3.64 −10314.31 −0.89 4.94 −22649.93 −2.28 4.16 −10547.50 −0.71 5.34 −24523.80 −2.70 4.67 −7104.02 −0.81 5.59 −14651.56 −5.00 5.33 −5971.01 −1.24 6.06 −14128.18 −2.49 5.92 −6483.35 −3.13 6.69 −14867.50 −2.16 6.53 −10587.74 −2.65 表 7 B2断面与B3断面水平应力对比、水平位移对比
B2深度/
mB2水平
应力/PaB2水平
位移/mmB3深度/
mB3水平
应力/PaB3水平
位移/mm0.00 −871.03 −7.54 0.00 −1049.50 −6.66 1.00 −4547.70 −6.45 1.00 −4221.56 −5.55 2.00 −2665.10 −5.35 2.00 −2467.67 −5.25 3.00 −7095.25 −5.24 3.00 −5801.65 −5.04 4.00 −5527.93 −5.84 4.00 −4716.56 −5.52 5.00 −3996.38 −6.02 5.00 −3392.85 −5.99 6.00 −5035.87 −6.51 6.00 −4759.82 −6.17 表 8 C2断面与C3断面水平应力对比、水平位移对比
C2深度/
mC2水平
应力/PaC2水平
位移/mmC3深度/
mC3水平
应力/PaC3水平
位移/mm0.00 −12081.99 −1.09 0.00 −8095.34 −1.07 0.48 −9488.07 −1.43 0.46 −7901.17 −1.17 0.77 −8462.41 −1.56 0.74 −7787.75 −1.42 1.07 −11846.11 −1.06 1.08 −8787.28 −0.99 1.27 −13335.44 −1.47 1.38 −11186.9 −1.24 1.51 −15279.62 −2.04 1.60 −14344.5 −1.91 1.84 −16438.31 −2.48 2.20 −15184.5 −2.14 2.24 −16985.97 −2.95 2.38 −15943.7 −2.60 -
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