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中南大学学报(自然科学版)

Journal of Central South University

第50卷    第1期    总第293期    2019年1月

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文章编号:1672-7207(2019)01-0108-10
砂土中松动土压力及松动区位移破坏形式的试验研究
陈其志1, 2,郭生根3,徐长节1, 2, 4, 5,梁禄钜1, 2,刘兴旺6

(1. 浙江大学 滨海和城市岩土工程研究中心,浙江 杭州,310058;
2. 浙江省城市地下空间开发工程技术研究中心,浙江 杭州,310058;
3. 江西省港航管理局,江西 南昌,330013;
4. 华东交通大学 土木建筑学院,江西 南昌,330013;
5. 江西省岩土工程基础设施安全与控制重点实验室,江西 南昌,330013;
6. 浙江省建筑设计研究院,浙江 杭州,310058
)

摘 要: 针对经典的Trapdoor问题,设计室内挡板下落模型试验装置,进行不同埋深比(埋深比为上覆土体高度与松动区宽度之比)的挡板下落模型试验,采用微型土压力盒量测试验全过程中挡板上方松动土压力的变化,对土体松动土压力及松动区位移破坏形式进行研究。将试验结果与文献既有解析解进行对比,进一步提出考虑挡板上土压力分布的修正松动土压力解析解。研究结果表明:由于土拱效应的存在,松动土压力小于土体自重土压力,松动土压力在试验初期迅速达到最小值,随后略有增长并达到稳定。利用颗粒图像测速技术研究松动区土体内部滑裂面发展规律,所得松动土压力与挡板上各位置松动土压力均吻合良好。松动区土体下移过程中均首先出现初始三角形滑裂面,随着松动区土体位移的增大,滑裂面发展呈现2种不同形式:当土体埋深比小于等于2时,呈逐渐张开展开形式;当土体埋深比大于2时,呈逐渐张开并塔型上升形式。

 

关键字: 模型试验;松动土压力;土拱效应;土体变形;砂土

Trapdoor model tests on loosening earth pressure and failure mode of loosening zone in sand
CHEN Qizhi1, 2, GUO Shenggen3, XU Changjie1, 2, 4, 5, LIANG Luju1, 2, LIU Xingwang6

1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
2. Engineering Research Center of Urban Underground Development of Zhejiang Province, Hangzhou 310058, China;
3. Jiangxi Province Harbor and Shipping Administration, Nanchang 330013, China;
4. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China;
5. Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering, Nanchang 330013, China;
6. Zhejiang Province Institute of Architectural Design and Research, Hangzhou 310058, China

Abstract:A trapdoor apparatus was designed to study the classic Trapdoor problem. Micro earth pressure cells were used to measure the loosening soil pressure on the trapdoor during whole period of tests. A series of trapdoor tests with different soil depth ratios (depth ratio is defined as the ratio of soil depth to trapdoor width) were conducted to analyze the loosening soil pressure and the failure mode of loosening zone. Tests results were compared with analytical solutions from literature and a modified analytical solution considering the stress distribution on trapdoor was proposed. The results show that because of soil arching effect, the loosening soil pressure is less than the soil weight. The loosening pressure quickly decreases to the minimum at initial stage of tests, then increases slightly and remains stable at last. Particle image velocimetry (PIV) method was used to analyze the development of slip surfaces in the loosening zone. Results calculated by proposed analytical solution fit well with the tests results. The initial slip surface is triangle slip surface. When the deformation of soil in loosening zone increases, there are two different forms of slip surfaces: it is called expansion form for condition that depth ratio is less than or equal to 2; or called expansion and tower raise form for condition that depth ratio is more than 2.

 

Key words: model test; loosening soil pressure; soil arching effect; soil deformation; sand

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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