华南地震

人工高陡边坡大直径灌注桩受力性能与数值模拟分析

万丹丹^1，2，宿文姬²，郑志文³，符诗存³

(1. 广州南沙经济技术开发区建设中心，广州 511455；2. 华南理工大学土木与交通学院，广州 510641；3. 广东省地质环境监测总站，广州 510510)

Mechanical Properties and Numerical Simulation Analysis of Large Diameter Cast-in-place Pile on Artificial High Steep Slope

WAN Dandan¹^，2，SU Wenji²，ZHENG Zhiwen³，FU Shicun³

(1. Nansha District Construction Center of Guangzhou，Guangzhou 511455，China；2. School of Civil Engineering and Transportation，South China University of Technology，Guangzhou 510641，China；3. Guangdong Geological Environment Monitoring Station，Guangzhou 510510，China)

Keywords：High steep slope;Large diameter cast-in-place pile;Mechanical properties;Numerical Simulation

DOI: 10.13512/j.hndz.2021.02.16

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为了研究人工高陡边坡段大直径灌注桩的受力性能和承载特性，开展了人工高陡边坡段大直径灌注桩的受力性能和数值模拟分析。提出了在人工高陡边坡段大直径灌注桩与桩基周围土体相互作用的内力计算公式，并利用MADAS GTS有限元软件建立有限元分析模型，研究了竖向荷载、桩长、边坡坡度、桩径等各种因素对桩基体系承载性状的影响，得出了竖向荷载的增大会增加桩基的受力和承载性能，但是在位移允许的情况下，决定桩基承载力的因素是桩身摩擦力；增大桩长可以有效的减小桩基沉降和水平位移，将桩基嵌入岩石层可以更大程度的控制桩基的沉降，同时减小桩基的内力；桩基选择在坡度较小的边坡上，使得桩基能够更好地进行承载；桩径的变化并不能较大的改变桩基的受力，而且会造成资源的消耗，所以实际工程中，不建议采用增大桩基直径的方法提高桩基的承载力。

In order to study the mechanical and bearing characteristics of large-diameter cast-in-place pile in high and steep slope section，the mechanical performance and numerical simulation analysis of large diameter cast-in-place pile in high and steep slope section are carried out. Using the finite element software of MADAS GTS to establish the finite element analysis model，the influence of vertical load， pile length，slope gradient and pile diameter on the bearing behavior of pile foundation system is studied，and it is concluded that the increase of vertical load will increase the bearing capacity of pile foundation，however，when the displacement is allowed，the factor determining the bearing capacity of pile foundation is the friction of pile body；enlarging the length of pile can effectively reduce the settlement and horizontal displacement of pile foundation，and embedding pile foundation into rock stratum can control the settlement of pile foundation to a greater degree and reduce the internal force of pile foundation at the same time；pile foundation is selected on the small slope，so that the pile foundation can better carry out the load；the variation of pile diameter cannot transform the stress of pile foundation largely，and it will cause the consumption of resources，so in the actual project，it is not recommended that to increase the diameter of pile foundation to improve the bearing capacity of pile foundation.

引言
1 工程概况
2 建立几何模型
3 人工高陡边坡大直径灌注桩体系承载性状影响因素分析
4 结论

表1 人工高陡边坡物理力学参数表<br/>Table 1 Physical and mechanical parameters of artificial high steep slope

表1 人工高陡边坡物理力学参数表
Table 1 Physical and mechanical parameters of artificial high steep slope

图1 有限元模型几何尺寸(m)<br/>Fig.1 Geometric dimension of finite element model (m)

图1 有限元模型几何尺寸(m)
Fig.1 Geometric dimension of finite element model (m)

图2 网格划分轴侧图<br/>Fig.2 Axis side view of mesh generation

图2 网格划分轴侧图
Fig.2 Axis side view of mesh generation

图3 不同竖向荷载作用下桩基沉降位移对比图<br/>Fig.3 Comparison of settlement displacement of pile foundation under different vertical loads

图3 不同竖向荷载作用下桩基沉降位移对比图
Fig.3 Comparison of settlement displacement of pile foundation under different vertical loads

图4 不同竖向荷载作用下桩顶沉降位移图<br/>Fig.4 Settlement displacement dDiagram of pile top under different vertical loads

图4 不同竖向荷载作用下桩顶沉降位移图
Fig.4 Settlement displacement dDiagram of pile top under different vertical loads

表2 有限元对照分析模型参数<br/>Table 2 Model parameters of finite element comparative analysis

表2 有限元对照分析模型参数
Table 2 Model parameters of finite element comparative analysis

图5 不同荷载作用下桩基水平位移对比图<br/>Fig.5 Comparison of horizontal displacement of pile foundation under different loads

图5 不同荷载作用下桩基水平位移对比图
Fig.5 Comparison of horizontal displacement of pile foundation under different loads

图6 不同荷载作用下桩基桩身摩擦力对比图<br/>Fig.6 Comparison of pile friction under different loads

图6 不同荷载作用下桩基桩身摩擦力对比图
Fig.6 Comparison of pile friction under different loads

图7 不同荷载作用下桩基轴力对比图<br/>Fig.7 Comparison of axial force of pile foundation under different loads

图7 不同荷载作用下桩基轴力对比图
Fig.7 Comparison of axial force of pile foundation under different loads

图8 不同桩长时各个桩基沉降位移图<br/>Fig.8 Settlement displacement diagram of each pile foundation with different pile lengths

图8 不同桩长时各个桩基沉降位移图
Fig.8 Settlement displacement diagram of each pile foundation with different pile lengths

图9 桩长不同时桩顶沉降位移图<br/>Fig.9 Settlement displacement diagram of pile top with different pile lengths

图9 桩长不同时桩顶沉降位移图
Fig.9 Settlement displacement diagram of pile top with different pile lengths

图10 不同桩长时各个桩基水平位移对比图<br/>Fig.10 Comparison of horizontal displacement of each pile foundation with different pile lengths

图10 不同桩长时各个桩基水平位移对比图
Fig.10 Comparison of horizontal displacement of each pile foundation with different pile lengths

图11 不同桩长时各个桩基桩身摩擦力对比图<br/>Fig.11 Comparison of friction force of each pile foundation with different pile lengths

图11 不同桩长时各个桩基桩身摩擦力对比图
Fig.11 Comparison of friction force of each pile foundation with different pile lengths

图12 不同桩长时桩基轴力对比图<br/>Fig.12 Comparison of axial force of pile foundation with different pile lengths

图12 不同桩长时桩基轴力对比图
Fig.12 Comparison of axial force of pile foundation with different pile lengths

图13 不同坡度时各个桩基沉降位移对比图<br/>Fig.13 Comparison of settlement displacement of each pile foundation under different slopes

图13 不同坡度时各个桩基沉降位移对比图
Fig.13 Comparison of settlement displacement of each pile foundation under different slopes

图14 不同坡度时各个桩基水平位移对比图<br/>Fig.14 Comparison of horizontal displacement of each pile foundation under different slopes

图14 不同坡度时各个桩基水平位移对比图
Fig.14 Comparison of horizontal displacement of each pile foundation under different slopes

图15 不同坡度时各个桩基桩身摩擦力对比图<br/>Fig.15 Comparison of friction force of Pile Foundation under different slopes

图15 不同坡度时各个桩基桩身摩擦力对比图
Fig.15 Comparison of friction force of Pile Foundation under different slopes

图16 不同坡度时各个桩基轴力对比图<br/>Fig.16 Comparison of axial force of each pile foundation under different slopes

图16 不同坡度时各个桩基轴力对比图
Fig.16 Comparison of axial force of each pile foundation under different slopes

图17 不同桩径时各个桩基沉降位移对比图<br/>Fig.17 Comparison of settlement displacement of each pile foundation with different pile diameters

图17 不同桩径时各个桩基沉降位移对比图
Fig.17 Comparison of settlement displacement of each pile foundation with different pile diameters

图18 不同桩径时各个桩基水平位移对比图<br/>Fig.18 Comparison of horizontal displacement of each pile foundation with different pile diameters

图18 不同桩径时各个桩基水平位移对比图
Fig.18 Comparison of horizontal displacement of each pile foundation with different pile diameters

图19 不同桩径时各个桩基桩身摩擦力对比图<br/>Fig.19 Comparison of friction force of each pile foundation with different pile diameters

图19 不同桩径时各个桩基桩身摩擦力对比图
Fig.19 Comparison of friction force of each pile foundation with different pile diameters

图20 不同桩径时各个桩基轴力对比图<br/>Fig.20 Comparison of axial force of each pile foundation with different pile diameters

图20 不同桩径时各个桩基轴力对比图
Fig.20 Comparison of axial force of each pile foundation with different pile diameters

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期刊信息

华南地震
（季刊）

主　　管广东省地震局

主　　办广东省地震局

协　　办福建省地震局、海南省地震局、广西壮族自治区地震局

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邮　　编 510070

电　　话 020-87687082

标准刊号 ISSN1001-8662
CN441266/P

备注

引言

1 工程概况

2 建立几何模型

3 人工高陡边坡大直径灌注桩体系承载性状影响因素分析

4 结论

期刊信息