高置换率散体材料桩-不透水桩多元组合桩复合地基固结分析

卢萌盟; 敖祖瑞; 李东旭; 李传勋

doi:10.11779/CJGE202107010

高置换率散体材料桩-不透水桩多元组合桩复合地基固结分析 English Version

卢萌盟^{1, 2,},
敖祖瑞^{1, 2, ,},
李东旭^{1, 2},
李传勋³

1.
中国矿业大学力学与土木工程学院,江苏　徐州　221006
2.
中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏　徐州　221006
3.
江苏大学土木工程与力学学院,江苏　镇江　212013

基金项目:

国家自然科学基金项目 51878657

国家自然科学基金项目 51878320

江苏省高校青蓝工程项目

详细信息

作者简介:
卢萌盟(1979— ),男,博士,教授,博士生导师,主要从事软黏土力学及地基处理方面的教学和科研工作。E-mail：lumm@cumt.edu.cn

通讯作者:
敖祖瑞, E-mail：azr96@cumt.edu.cn

中图分类号: TU470
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出版历程
- 收稿日期: 2020-10-29
- 网络出版日期: 2022-12-02
- 刊出日期: 2021-06-30

Consolidation analysis of composite foundation with multiple and reinforcements by granular columns with high replacement ratio impervious piles

LU Meng-meng^{1, 2,},
AO Zu-rui^{1, 2, ,},
LI Dong-xu^{1, 2},
LI Chuan-xun³

1.
School of Mechanics and Civil Engineering, China University of Mining and technology, Xuzhou 221006, China
2.
State Key Laboratory of Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221006, China
3.
Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China

摘要

摘要: 多元复合地基是近年出现的一种新型的复合地基形式,其利用两种或者两种以上的桩型对地基土进行加固,以期达到提高地基承载力,减小工后沉降,加速地基固结的作用。以高置换率散体材料桩联合不排水桩的多元复合地基为研究对象,通过引入散体材料桩内径、竖向渗流,对散体材料桩和土体均采用固结方程进行求解,同时考虑多元桩和土体共同承担外部荷载,推导了该多元组合型复合地基的固结控制方程及解析解答,并对解答的合理性进行了验证,最后对多元组合型复合地基的固结性状进行分析。
- 复合地基 /
- 高置换率 /
- 固结 /
- 散体材料桩 /
- 不透水桩
Abstract: The composite foundation with multiple reinforcements is a newly emerging technique to stabilize soft soils. By this technique, two or more types of differenent piles are combined to stabilize soft soils by increasing the bearing capacity, reducing the post-construction settlement and accelerating the consolidation rate. The composite foundation stabilized by the granular columns with high replacement ratio and impervious piles are selected for analysis. By considering the radial and vertical flows within the granular columns, the consolidation of the granular columns is analyzed in the same way as that for the surrounding soils. Moreover, the surcharge loads are considerd to be supported by the granular columns, the impervious piles and the soft soils together. Then the governing equation for consolidation of this type of composite foundation and the corresponding analytical solutions are derived. The rationality of the solution is futher discussed and verified. Finally, the consolidation behavior of the composite foundation is analysed.
- composite foundation /
- high replacement ratio /
- consolidation /
- granular column /
- impervious pile

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图 1 多元复合地基布置方式图

Figure 1. Layout of composite foundation with multiple reinforcements

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图 2 组合桩复合地基固结计算模型

Figure 2. Computational model for combined composite foundation

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图 3 多级瞬时荷载加载形式

Figure 3. Multi-stage instantaneous loading

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图 4 4种模型固结速度比较

Figure 4. Comparison of consolidation of four models

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图 5 桩体水平渗透系数对固结速度的影响

Figure 5. Influences of horizontal permeability coefficient of granular columns on consolidation

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图 6 不透水桩置换率对地基固结的影响

Figure 6. Influences of replacement ratio of impervious piles on consolidation

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图 7 散体材料桩桩径对固结度的影响

Figure 7. Influences of radius of granular columns on degree of consolidation

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图 8 压缩模量比对地基固结的影响

Figure 8. Influences of confined compression modulus ratio on consolidation

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图 9 不同时刻下平均孔压随深度的变化曲线

Figure 9. Variation curves of average excess pore water pressure with depth at different time

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图 10 桩内径向渗透系数与土体渗透系数比不同对桩体内平均孔压的影响

Figure 10. Influences of permeability coefficient ratios on average excess pore water pressure

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图 11 桩体内平均孔压在不同深度处随时间的消散曲线

Figure 11. Time-dependent dissipation curves of average excess porepressure at different depths

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图 12 不透水桩数量对桩体内平均孔压的影响

Figure 12. Influences of number of impervious piles on average pore water pressure

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表 1 模型参数取值表

Table 1 Values of model parameters

参数	取值	参数	取值
H/r_c	30	k_h/k_vc	0.001
r_e/r_c	3.063	k_hc/k_vc	1
r_n/r_c	3.103	E_c/E_s	5
r_s/r_c	1	E_p/E_s	10
k_h/k_v	2	Y_Y	1.649
k_h/k_s	1	z/H	0.500
注：r_s为土体涂抹区半径,k_s为涂抹区渗透系数。本文不考虑涂抹效应,故有r_s/r_c=1, k_h/k_s=1。

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