[1]杨涵晞,王梦洁,夏梦灿,等.交通荷载下漫灌区水泥土桩复合地基的动力特性[J].长安大学学报(自然科学版),2025,45(5):117-128.[doi:10.19721/j.cnki.1671-8879.2025.05.010]
　YANG Han-xi,WANG Meng-jie,XIA Meng-can,et al.Dynamic characteristics of cement soil pile composite foundation in flood irrigation area under traffic load[J].Journal of Chang’an University (Natural Science Edition),2025,45(5):117-128.[doi:10.19721/j.cnki.1671-8879.2025.05.010]
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交通荷载下漫灌区水泥土桩复合地基的动力特性()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第45卷
期数:
2025年5期
页码:
117-128
栏目:
桥梁与隧道工程
出版日期:
2025-09-30

文章信息/Info

Title:
Dynamic characteristics of cement soil pile composite foundation in flood irrigation area under traffic load
文章编号:
1671-8879(2025)05-0117-12
作者:
杨涵晞1; 2; 王梦洁3; 夏梦灿3; 张天阳3; 孙巍锋4
(1. 长安大学 经济与管理学院,陕西 西安 710064; 2. 西安交通大学 人居环境与建筑工程学院,陕西 西安 710049; 3. 长安大学 公路学院,陕西 西安 710064; 4. 长安大学 地质工程与测绘学院,陕西 西安 710054)
Author(s):
YANG Han-xi1; 2;  WANG Meng-jie3;  XIA Meng-can3;  ZHANG Tian-yang3;  SUN Wei-feng4
(1. School of Economics and Management, Chang'an University, Xi'an 710064, Shaanxi, China; 2. School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China; 3. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 4. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China)
关键词:
路基工程;  漫灌区;  复合地基;  动力特性;  扭剪试验;  数值模拟
Keywords:
Key words:subgrade engineering;  flood irrigation area;  composite foundation;  dynamic characteristic;  torsional shear test;  numerical simulation
分类号:
U416.1
DOI:
10.19721/j.cnki.1671-8879.2025.05.010
文献标志码:
A
摘要:
为探究漫灌区低路堤复合地基在交通荷载作用下的长期性能与变形控制问题,通过开展空心圆柱扭剪试验,分析了循环荷载下纯土和水泥土的累积塑性应变和动弹性模量的变化规律,建立了水泥土动弹性模量与竖向循环应力比和循环扭剪应力比的定量关系表达式; 在此基础上,采用数值模拟方法探讨了复合地基在不同水泥土桩长、面积置换率、车辆轴重下的动力响应。研究结果表明:单次荷载作用下水泥土的应变为纯土的1/8～1/6,10 000次循环加载后,水泥土的累积塑性应变为纯土的1/12～1/6,动弹性模量为纯土的3～4倍; 水泥土在竖向循环应力比较低时产生的累积塑性应变低于较高水平时,动弹性模量则呈现相反的规律,当竖向循环应力比分别为0.15、0.25和0.35时,水泥土平均累积塑性应变分别为3.39%、13.22%和16.52%,平均动弹性模量分别为127.13、119.62和99.89 MPa; 竖向循环应力比较低时,循环扭剪应力比的增大对水泥土累积塑性应变增幅的影响更显著,尤其在循环扭剪应力比不大于0.2时; 水泥土的动弹性模量随竖向循环应力比和循环扭剪应力比的增大呈衰减态势,以竖向动应力等于土体自重应力的10%作为临界阈值,交通荷载对低路堤水泥土复合地基的影响深度在3.5 m左右,鉴于此,建议漫灌区低路堤水泥土复合地基桩长控制在6 m,面积置换率不超过16.8%。
Abstract:
To investigate the long-term performance and deformation control of low embankment composite foundation in flood irrigation area under traffic load, hollow cylinder torsional shear tests were conducted to analyze the changes in cumulative plastic strains and dynamic elastic moduli of pure soil and cement soil under cyclic load. Quantitative expressions for the dynamic elastic modulus of cement soil were established in relation to the vertical cyclic stress ratio and cyclic torsional shear stress ratio. On this basis, numerical simulation methods were used to explore the dynamic responses of composite foundations under different cement soil pile lengths, area replacement rates, and vehicle axle loads. The research results show that the strain of cement soil under a single load is 1/8-1/6 of that of pure soil. After 10 000 cycles of loading, the cumulative plastic strain of cement soil is 1/12-1/6 of that of pure soil, and the dynamic elastic modulus is 3-4 times that of pure soil. The cumulative plastic strain of cement soil under a low vertical cyclic stress is lower than that under a higher level. While the dynamic elastic modulus shows the opposite pattern. When the vertical cyclic stress ratio is 0.15, 0.25, and 0.35, the average cumulative plastic strain of cement soil is 3.39%, 13.22%, and 16.52%, and the average dynamic elastic modulus is 127.13, 119.62, and 99.89 MPa, respectively. When the vertical cyclic stress ratio is low, the increase in the cyclic torsional shear stress ratio has a more significant effect on the increase in the cumulative plastic strain of cement soil, especially, when the cyclic torsional shear stress ratio is not greater than 0.2. The dynamic elastic modulus of cement soil decreases with the increases in the vertical cyclic stress ratio and cyclic torsional shear stress ratio. The critical threshold is determined by the vertical dynamic stress being equal to 10% of the self-weight stress of the soil. The influencing depth of traffic load on the low embankment cement soil composite foundation is about 3.5 m. Therefore, it is recommended to control the pile length of the low embankment cement soil composite foundation in the flood irrigation area at 6 m, and the area replacement rate no exceeding 16.8%.2 tabs, 11 figs, 31 refs.

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备注/Memo

备注/Memo:
收稿日期:2025-03-04
基金项目:国家自然科学基金项目(42307217); 晋中市科技计划项目(市科发[2022]28号)
作者简介:杨涵晞(1994-),女,陕西西安人,工程师,工学博士研究生,E-mail:yanghanxi@chd.edu.cn。
更新日期/Last Update: 2025-09-30