Analysis of the influence of solidified slurry buttress support on the deformation of soil outside the pit
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摘要: 为推动废弃泥浆的资源化利用，提出将工程废弃泥浆改良并用于扶壁式基坑支护结构中的扶壁墙。利用PLAXIS 3D有限元软件建立三维模型，验证模型可靠性并对比分析有无泥浆扶壁作用下坑外土体变形的差异。计算结果表明：模型较好地反映了坑外土体变形情况，相较无泥浆扶壁，支护中预先设置的泥浆扶壁墙体可减小坑外地表土体变形，在各种参数的不利工况下，地表沉降量降幅仍可达73.3%，地表水平位移降幅可达66.4%；预置扶壁墙对坑外深层土体变形趋势影响较小，可有效控制坑外深层土体变形，并缩小不利变形影响区域；预置泥浆扶壁墙不仅能够对坑外土体变形所产生的角应变和拉应变进行约束，也能降低角应变和拉应变影响范围，进而一定程度上减少角应变和拉应变对坑边既有建构筑物及管线的损害。Abstract: To effectively solve the two major problems of controlling engineering waste generation and foundation pit deformation, this research proposes to improve the engineering waste mud and use it in the buttress wall of the buttress foundation pit support structure. The three-dimensional model was established by using PLAXIS 3D finite element software. The reliability of the model was verified and the difference of soil deformation outside the pit under the action of slurry buttress was compared and analyzed. The calculation results show that the constitutive model can better reflect the deformation of the soil outside the pit. Compared with no slurry buttress, the pre-buried slurry buttress wall can pre-suppress the adverse deformation of the surface soil outside the pit. Under the most dangerous working conditions, the surface settlement can be reduced by 73.3%, and the horizontal displacement of the surface can be reduced by 66.4%. The embedded buttress wall has little effect on the deformation trend of deep soil outside the pit, but it can effectively control the deformation of deep soil outside the pit and reduce the area affected by adverse deformation. The embedded slurry buttress wall can not only constrain the maximum angular strain and tensile strain generated by the deformation of the soil outside the pit, but also reduce the influence range of angular strain and tensile strain, thus reducing the damage of angular strain and tensile strain to the existing buildings near the pit to a certain extent.
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图 3 原基坑支护结构实测测点图
Figure 3. Measured measuring point diagram of the original foundation pit supporting structure
图 4 固化泥浆扶壁式基坑支护体系
Figure 4. Solidified slurry buttressed foundation pit supporting system
图 6 无扶壁围护结构及坑外地表土体变形趋势对比
Figure 6. Comparison of the deformation trend of the retaining structure without buttress and the surface soil outside the pit
图 7 不同工况下坑外地表沉降曲线
Figure 7. Ground surface settlement curve outside the pit under different working conditions
图 9 不同工况下坑外地表水平变形曲线
Figure 9. Horizontal deformation curve of ground surface outside the pit under different working conditions
图 10 坑外土体深层水平位移曲线
Figure 10. Deep horizontal displacement curve of soil outside the pit
表 1 模型土体参数表
Table 1. Model soil parameters table
土层性质 γ /(kN·m−3) c′ /kPa φ′ /(°) E50 /MPa Eoed /MPa Eur /MPa G0 /MPa γ0.7/×10−4 e ④ 1黏土 18.6 6.0 22.1 3.96 3.96 23.76 47.5 1.5 1.015 ⑥ 2淤泥质土 17.9 1.0 17.0 2.73 2.73 19.11 38.2 1.5 1.173 ⑥ 4粉质黏土 20.1 9.5 28.6 6.81 6.81 44.27 88.5 1.7 0.875 ⑧ 1粉质黏土 20.2 14.0 25.7 6.91 6.91 48.37 130.6 4.2 0.672 ⑨ 2粉砂 19.8 5.4 32.2 15.24 15.24 60.96 152.4 4.5 0.602 ⑩ 1粉质黏土 20.6 15.8 19.4 4.00 4.00 44.00 118.8 4.2 0.738 ⑪ 2粉砂 20.1 5.5 32.6 13.75 13.75 55.00 148.5 4.5 0.614 
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表 2 基坑开挖工况流程
Table 2. Foundation pit excavation process
工况 开挖深度/m 工作内容 架设支撑深度/m 材质 Ⅰ −1.8 拆除预埋泥浆扶壁 −1.3 钢混支撑 Ⅱ −6 −5.5 钢支撑 Ⅲ −10.2 −9.7 钢支撑 Ⅳ −14 −13.5 钢支撑 Ⅴ −17.07
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