钱塘江边冲海积粉土基坑安全性数值分析

杨迎晓; 陈峰

doi:10.11779/CJGE2014S2004

钱塘江边冲海积粉土基坑安全性数值分析 English Version

杨迎晓^{1, 2},
陈峰^{1, 3}

1. 浙江树人大学城建学院,浙江杭州 310015;
2. 浙江大学滨海和城市岩土工程研究中心,浙江杭州 310058;
3. 浙江欣捷建设有限公司宁波分公司,浙江宁波 315000

基金项目: 浙江省大学生科技创新项目（2013R420018）; 浙江省科技计划项目（2008C33002）; 浙江省高校十二五重点学科资助项目（[2012]80-291）

详细信息

作者简介:
杨迎晓(1963- ),女,浙江嘉兴人,博士,教授,主要从事土力学及基坑工程方面的研究与教学工作。E-mail: 770499445@qq.com。

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- 文章访问数: 346
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出版历程
- 收稿日期: 2014-07-27
- 发布日期: 2014-07-27

Numerical simulation of safety evaluation of alluvial silt foundation pits along Qiantang River

YANG Ying-xiao^{1, 2},
CHEN Feng^{1, 3}

1. Urban Construction College, Zhejiang Shuren University, Hangzhou 310015, China;
2. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
3. Zhejiang Xinjie Construction Co., Ltd., Ningbo 315000, China

摘要

摘要: 钱塘江流域正在开展大规模的建设,河口两岸海塘、江边基坑面临洪水、强潮的严重侵袭。选择钱塘江土海塘典型地质剖面和砼海塘典型地质剖面,考虑钱塘江粉土的剪胀性,采用Hardening-Soil本构模型,数值研究潮位及离江距离、围护墙嵌固深度、开挖深度对基坑安全性的影响,分析江边粉土基坑破坏模式。结果表明：高潮位下,土海塘典型地质剖面的江边基坑,可能出现海塘先于基坑破坏的模式;基坑开挖深度较小时,支护结构整体向坑内倾倒破坏;基坑开挖深度较大,呈踢脚破坏模式。坑底边旁在距围护墙的嵌固深度一半范围内,容易发生流土破坏。
- 江边基坑 /
- 江水位 /
- 安全性 /
- 破坏模式 /
- 数值模拟
Abstract: Large-scale construction is being conducted along the Qiantang River. However, the foundation pits along the river are threatened by floods and strong tides. Typical geological cross sections of the soil seawalls and concrete seawalls along the river are selected for this study, and the dilatant characteristics of silt are taken into account. Numerical simulations based on the hardening-soil model are carried out to study the effects of the river tidal level, pit-river distance, insertion depth of enclosure walls and pit excavation depth on the safety of the alluvial silt foundation pits. The results demonstrate that under high tidal levels the pits with cross sections of soil seawalls will probably display a mode in which the destruction of seawalls occurs before the destruction of the pits. Moreover, the support and protection structures will fall down into the pit as a whole when the pit evacuation depth is small. When the pit evacuation depth is large, however, the support and protection structures will display a kicking destruction mode. Additionally, the flowing-soil destruction is found to occur most easily when the pit bottom is within half the insertion depth of enclosure walls.
- riverside pit /
- water level /
- safety evaluation /
- failure mode /
- numerical simulation

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参考文献(8)

[1]	曹颖, 余炯. 钱塘江杭州段边滩最大冲刷预测[J]. 杭州应用工程技术学院学报, 2000, 10(12): 30-33. (CAO Ying, YU Jiong. Prediction of maximum erosion on the flat in Hangzhou Reach,Qiantang River[J]. Journal of Hangzhou Institute of Applied Engineering, 2000, 10(12): 30-33. (in Chinese))
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[4]	杨学林. 基坑工程设计、施工和监测中应关注的若干问题[J]. 岩石力学与工程学报, 2012, 31(11): 2329-2333. (YANG Xue-lin. Several issues in design,construction and monttoringe of foundation pits[J]. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(11): 2329-2333. (in Chinese))
[5]	杨迎晓, 龚晓南, 金兴平, 等. 钱塘江冲海积非饱和粉土剪胀性三轴试验研究[J]. 岩土力学, 2011, 32(增刊1): 38-42. (YANG Ying-xiao, GONG Xiao-nan, JING Xing-ping, et al. Triaxial testing study of dilatant characteristics of Qiantangjiang alluvial unsaturated silts[J]. Rock and Soil Mechanics, 2011, 32(S1): 38-42. (in Chinese))
[6]	杨迎晓, 朱向荣, 金兴平, 等. 钱塘江冲海积粉土剪胀性三轴试验研究[J]. 岩土力学, 2010, 31(增刊2): 48-52. (YANG Ying-xiao, ZHU Xiang-rong, JING Xing-ping, et al. Triaxial testing study of dilatant characteristics of Qiantangjiang alluvial silts[J]. Rock and Soil Mechanics, 2010, 31(S2): 48-52. (in Chinese))
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文章访问数: 346
HTML全文浏览量: 4
PDF下载量: 306
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钱塘江边冲海积粉土基坑安全性数值分析 English Version

作者简介: 杨迎晓(1963- ),女,浙江嘉兴人,博士,教授,主要从事土力学及基坑工程方面的研究与教学工作。E-mail: 770499445@qq.com。

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出版历程

Numerical simulation of safety evaluation of alluvial silt foundation pits along Qiantang River

计量

出版历程

目录

作者简介:
杨迎晓(1963- ),女,浙江嘉兴人,博士,教授,主要从事土力学及基坑工程方面的研究与教学工作。E-mail: 770499445@qq.com。