﻿ 双排桩加固素填土高边坡方法研究

# 双排桩加固素填土高边坡方法研究Research on Reinforce Method of Plain Fill High Slope by Double-Row Pile Structure

Abstract: Research purpose: Through analyzing reinforce method of plain fill high slope by double-row pile structure, the author gets the problem and solution in investigation, design, construction and monitoring of the plain full high slope. Research conclusion: 1) The design process of plain fill slope should be mutually verified with the numerical analysis method, which is improving the reliability and rationality of the result. 2) It is found that the bending moment of the pile in front and rear row is an s-shaped distribution with left and right mirror images. 3) The front pile bears greater shear force and bending moment, so the front pile should be strengthened in the structural design process. 4) The conclusion of this study could guide the similar geotechnical engineering.

1. 引言

2. 素填土边坡治理实践

2.1. 工程及地质概况

Figure 1. Typical section of plain fill slope under limited site conditions

2.2. 设计方案

3. 有限元分析

3.1. 有限元模型参数

Figure 2. Finite element model geometry size diagram

Table 1. Parameter of geo-technical material

Table 2. Parameter of structure

3.2. 变形结果分析

Figure 3. Nephogram: Vertical displacement

Figure 4. Nephogram: Horizontal displacement

Figure 5. Nephogram: Horizontal displacement of double-row piles

3.3. 剪力分析

Figure 6. Nephogram: Shear force of double-row piles

3.4. 弯矩分析

Figure 7. Nephogram: Bending moment of double-row piles

Figure 8. Curve: Horizontal displacement of pile

Figure 9. Curve: Comparison of horizontal displacement of pile

3.5. 监测结果分析

4. 结论

1) 素填土边坡设计过程可利用数值方法，合理选取模型及材料参数，认真分析数值结果，对设计结果进行验证，提高设计成果的可靠性及合理性。

2) 双排桩结构前后排桩桩身弯矩呈左右镜像的S型分布，在前排桩桩顶以下3~4 m处负弯矩达到最大，在嵌固点以下1~2 m处出现正弯矩最大值；后排桩正弯矩最大值出现在桩顶，最大负弯矩则出现在嵌固点以下5~6 m处。

3) 由于前排桩悬臂端临空，桩前土体抗力通过咬合旋喷桩加固得到了提高，外部约束条件的突然改变，使得整个门架式双排桩支挡结构受力体系中，前排桩承担了更大的剪力与弯矩，结构设计过程应对予以加强。

[1] 陈祖煜. 土质边坡稳定性分析原理方法程序[M]. 北京: 中国水利水电出版社, 2003.

[2] 李宏杰, 等. 220 kV盐津变电所填土边坡稳定性研究[J]. 岩土力学, 2008, 29(12): 3459-3465.

[3] 唐尧. 深圳“1220”山体滑坡灾害成因及安全防范分析[J]. 国土资源情报, 2016(1): 39-43.

[4] 林宗元. 简明岩土工程勘察设计手册[M]. 北京: 中国建筑工业出版社, 2003.

[5] 贺刚, 蒋楚生. 边坡岩土工程不确定性及对策分析[J]. 铁道工程学报, 2010(4): 19-22.

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