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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

42卷

期数:

2025年03期

页码:

183-195

栏目:

岩土工程

出版日期:

2025-05-30

文章信息/Info

Title:

Experimental study and numerical simulation on deformation characteristics of marine soft foundation soil of Wenzhou under cyclic loading

文章编号:

1673-2049(2025)03-0183-13

作者:

张莎莎¹,郝智晨¹,张天工¹,王志丰¹,徐建强^1,2

(1. 长安大学 公路学院,陕西 西安 710064; 2. 招商局重庆交通科研设计院有限公司,重庆 400067)

Author(s):

ZHANG Shasha¹, HAO Zhichen¹, ZHANG Tiangong¹, WANG Zhifeng¹, XU Jianqiang^1,2

(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. China Merchants Chongqing Communications Technology Research & Design Institute Co., Ltd., Chongqing 400067, China)

关键词:

海相软基土;  循环荷载;  颗粒流模拟;  循环应力比

Keywords:

marine soft foundation soil;  cyclic loading;  particle flow simulation;  CSR

分类号:

TU447

DOI:

10.19815/j.jace.2023.11073

文献标志码:

A

摘要:

为了解海相软基土在交通荷载下的变形规律,对温州重塑海相软基土进行了一系列长期循环三轴试验,对比分析了不同排水条件下循环应力比(CSR)对海相软基土宏观变形特性的影响,揭示了塑性变形、应力-回弹应变滞回圈、回弹模量的变化规律,在此基础上建立了塑性变形与CSR、循环次数之间的定量关系。通过颗粒流模拟揭示了循环荷载作用下海相软基土的微观变形特性。根据相关规范对软土地区容许变形的规定以及塑性变形不同发展模式,明确过渡状态的划分标准并得到塑性变形稳定发展的CSR值上限。结果表明:随着CSR的增大,塑性变形逐渐呈对数式增长,并且表现出4种不同的发展模式,相较于不排水条件,部分排水条件下的塑性变形增长了0.07%～3.2%; 随循环次数的增加,应力-回弹应变滞回圈的面积先增加后减小,回弹模量在大幅度衰减后有所增加; 颗粒运动从竖向挤压逐渐变为侧向滑移,并且其运动方向具有明显的各向异性。

Abstract:

In order to understand the deformation law of marine soft foundation soil under traffic load, a series of long-term cyclic triaxial tests were carried out on the remolded marine soft foundation soil in Wenzhou. The effects of cyclic stress ratio(CSR)on the macroscopic deformation characteristics of marine soft foundation soil under different drainage conditions were compared and analyzed. The variation rules of plastic deformation, stress-resilient strain hysteresis loop and resilient modulus were revealed. On the basis, the quantitative relationship between plastic deformation and CSR, cycle times was established. The microscopic deformation characteristics of marine soft foundation soil under cyclic loading were revealed by particle flow simulation. According to the provisions of the relevant specifications on the allowable deformation of soft soil areas and different development modes of plastic deformation, the division standard of transition state was clarified and the upper limit of CSR value for stable development of plastic deformation was obtained. The results show that with the increase of CSR, the plastic deformation gradually increases logarithmically and shows four different development modes. Compared with undrained conditions, the plastic deformation under partially drained conditions increases by 0.07%-3.2%. With the increase of the number of cycles, the area of the stress-resilient strain hysteresis loop increases first and then decreases, and the resilient modulus increases after a large attenuation. The particle motion gradually changes from vertical extrusion to lateral slip, and its motion direction has obvious anisotropy.

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相似文献/References:

[1]曹 军,王康宇,骆大江.循环荷载作用下土拱效应的离散元研究[J].建筑科学与工程学报,2023,40(03):152.[doi:10.19815/j.jace.2021.11032]
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备注/Memo

备注/Memo:

收稿日期:2023-11-21
基金项目:国家自然科学基金项目(52178310)
作者简介:张莎莎(1982-),女,工学博士,副教授,E-mail:zss_lx@126.com。
Author resume: ZHANG Shasha(1982-), female, PhD, associate professor, E-mail: zss_lx@126.com.

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更新日期/Last Update: 2025-06-01