云计算-排桩复合土钉支护体系变形及稳定性计算方法研究.pdf资源-CSDN文库

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摘要

排桩复合土钉支护是将排桩与土钉相互结合的一种新型基坑支护形式。排

桩作为竖向结构，刚度较大，能够克服传统土钉支护基坑位移较大的缺点，而

土钉通过注浆改善了原状土体的性质，使土体应力得到重分布，增加了桩间土

体的稳定性，二者相互作用，共同限制基坑的变形，维持基坑稳定。如果基坑

周边环境复杂，对变形的要求比较严格，对土钉施加预应力，将有助于进一步

减小基坑侧壁的位移。目前，排桩复合土钉支护结构在实际工程中已有所应用，

但是相关的研究甚少，理论认知远落后于工程实践。

基于此，本文采用有限元数值模拟结合理论分析，研究了预应力施加对排

桩复合土钉支护受力变形以及稳定性的影响，基于排桩复合土钉支护结构受力

变形规律推导了支护结构以及土钉施加预应力条件下支护结构的水平位移简化

计算方法，采用强度折减法对排桩复合土钉支护结构的整体稳定性进行了分析，

并建立了排桩复合土钉支护整体稳定性计算表达式。主要研究成果及结论如下：

（1）通过 ABAQUS 有限元软件建立三维有限元模型，模拟了预应力施加

位置以及预应力大小对排桩复合土钉支护结构受力变形及稳定性的影响，研究

得出，预应力施加在基坑边坡中上部对减小桩间土体的水平位移和排桩侧移的

效果较好，预应力施加位置以及预应力大小的改变对基坑边坡地表沉降以及坑

底隆起的影响很小，基本上可以忽略不计。

（2）基于弹性地基梁法，结合结构力学的相关理论，建立了排桩水平位移

的计算模型，通过有限元模拟的土钉轴力规律，建立了土钉变形计算模型，引

入增量法的思想，并基于排桩与土钉的变形协调推导了考虑施工过程的排桩复

合土钉支护结构水平位移简化计算方法，通过有限元算例和工程实例的计算，

表明该方法具有可行性；在此基础上，推导了排桩复合预应力土钉支护结构的

水平位移简化计算方法，通过有限元算例的验证表明该方法亦具有合理性。

（3）采用有限元强度折减法分析了排桩复合土钉支护基坑的破坏模式，研

究得出，基坑整体稳定性随排桩的嵌固深度和土钉长度的增大而增强，但均存

在界限值；当土钉长度一定时，随着排桩嵌固深度的增大，基坑破坏时的滑裂

面由桩下弧转变为桩底弧，再转变为过桩弧；当排桩嵌固深度一定时，随着土

万方数据

Abstract

III

Abstract

Row piles and composite soil nailing structure ,which combine row piles and

soil nails,is a new type of bracing structure of foundation pits.Row piles as a vertical

structure,it is able to overcome the shortcomings of large displacement of traditional

soil nailing supporting foundation pits ,because of its great stiffness. And through the

grouting soil nails improve properties of undisturbed soil, and get re-distribution of

soil stress, increase the stability of the soil between row piles.Both interact to limit

the deformation of foundation pits together and maintain the stability of foundation

pits.If the surrounding environment of the foundation pits is complex, it need more

stringent requirements for the deformation,prestressed soil nails will help to further

reduce the displacement of pit sidewalls.Currently, Row piles and composite soil

nailing structure has been applied in the actual projects,however,the related

researches of the retaining structure are little, cognitive theories are far behind the

engineering practice.

Based on this, in this paper, using the finite element numerical simulation and

combined with theoretical analysis to study the influence on force ,deformation and

the stability of row piles and composite soil nailing structure by prestressing. Then

this paper deduces the simplified calculation method of horizontal displacement of

the retaining structure and the retaining structure under prestressed soil nail

conditions based on the law of force and deformation of this structure.The overall

stability of this structure has been analysed by using strength reduction method,and

establish the calculation formula of the overall stability of row piles and composite

soil nailing structure, The main research results and conclusions are as follows:

（1）Three-dimensional finite element model is established by ABAQUS finite

element software ,to simulate the effects of prestressed position and size of row piles

and composite soil nailing structure,concluding force ,deformation and the

stability.Turn out that , the prestress in the upper part of the foundation pit slope is

better for the decrease of the horizontal displacement of the soil between piles and

万方数据

Abstract

row piles;the influence of ground surface settlement and bottom heave by prestressed

position and size is very small,it can be neglected basically.

（2）This paper establishes a calculation model of horizontal displacement of

row piles based on elastic foundation beam method and combines with the theory of

structural mechanics. The calculation model of deformation of soil nails is established

by the axial force of soil nails of finite element simulation.To introduct incremental

method,it deduces a simplified calculation method of horizontal displacement of row

piles and composite soil nailing structure based on the deformation compatibility

between row piles and soil nails by considering construction process. On the basis of

this,it deduces a simplified calculation method of horizontal displacement of the

retaining structure under prestressed soil nail conditions.This method is verified by

finite element numerical examples which show this the method is reasonable.

（3）The failure mode of row piles and composite soil nailing foundation pits is

analysed by using the strength reduction finite element method, turn out that,the

overall stability of foundation pits enhances with the increase of embedded depth of

row piles and soil nailing length.But there is a threshold value; When the length of

soil nails is certain, the sliding surface of foundation pits at failure transforms from

arc under pile to pile bottom arc,and then transforms the arc cutting pile with the

increase of the embedded depth of row piles;When embedded depth of row piles is

certain, the sliding surface of foundation pits at failure transforms from the arc cutting

pile to arc under pile with the increase of the length of soil nails.

（4）Based on the analysis the role of row piles and soil nails in the overall

stability,it estabilishes a calculationformula of overall stability of row piles and

composite soil nailing foundation pits, through the finite element calculation example

shows that the method of stability analysis is reasonable and feasible.

Key words:foundation pit engineering, row piles and composite soil nailing,prestress,

the calculation of deformation, strength reduction method, overall stability

万方数据

摘要 ............................................................................................................ I

Abstract .................................................................................................... III

1 绪论 ..................................................................................................... 1

1.1 研究背景及意义 ........................................................................................... 1

1.2 土钉支护 ....................................................................................................... 2

1.2.1 土钉支护概述 ..................................................................................................... 2

1.2.2 土钉支护研究现状 ............................................................................................. 3

1.3 复合土钉支护 ............................................................................................... 5

1.3.1 复合土钉支护概述 ............................................................................................. 5

1.3.2 复合土钉支护研究现状...................................................................................... 7

1.4 排桩复合土钉支护 ..................................................................................... 10

1.4.1 排桩复合土钉支护概述.................................................................................... 10

1.4.2 排桩复合土钉支护研究现状 ............................................................................ 10

1.5 本文研究的主要内容及技术路线 ............................................................. 12

1.5.1 本文研究的主要内容 ....................................................................................... 12

1.5.2 技术路线 ........................................................................................................... 13

2. 排桩复合预应力土钉支护结构三维有限元分析 ............................ 14

2.1 引言 ............................................................................................................... 14

2.2 三维有限元模型的建立 ............................................................................... 14

2.2.1 土体本构模型 ..................................................................................................... 14

2.2.2 结构单元的选取及结构间接触类型 .................................................................. 15

2.2.3 预应力的施加方法 ............................................................................................. 15

2.2.4 几何模型简介 ..................................................................................................... 16

2.2.5 土体及支护结构的参数....................................................................................... 17

2.2.6 开挖与支护过程的模拟....................................................................................... 18

2.3 预应力施加对排桩复合土钉支护结构的影响 ......................................... 18

2.3.1 排桩复合土钉支护变形性状分析 ...................................................................... 19

2.3.2 预应力施加位置对排桩复合土钉支护结构的影响 .......................................... 20

万方数据

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