人工堆山边坡稳定性数值分析

赵波; 许宝田; 阎长虹; 王威

人工堆山边坡稳定性数值分析

1.
镇江市建设工程质量监督站镇江 212000;
2.
南京大学地球科学与工程学院南京 210093

基金项目:

镇江市建设局资助项目(2009G001)

详细信息

作者简介:
赵波,主要从事边坡工程的设计和监测工作.Email: zhangqingxubt@163.com

中图分类号: TU457
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出版历程
- 收稿日期: 2010-10-20
- 修回日期: 2011-05-05
- 刊出日期: 2011-12-25

NUMERICAL ANALYSIS OF SLOPE STABILITY FOR ARTIFICIAL LANDSCAPE HILL

1.
Project Quality Supervision Station of Zhenjiang City,Zhenjiang 212000;
2.
School of Earth Sciences and Engineering,Nanjing University,Nanjing 210093

摘要

摘要: 镇江市蛋山堆山工程是在原蛋山废弃采石场地基上,采用建筑垃圾堆筑起一座具景观功能的新蛋山,堆土厚度最大达50m,该工程西侧地基中分布有厚度较大的软土层,勘察试验结果表明该软土层强度低,压缩性高,对新山体的变形和稳定性有很大的影响。本文以该工程为例,采用数值分析法对软土地基上人工堆山边坡的变形和稳定性进行了研究,计算时对堆土施工过程中4个阶段的岩土体变形和孔隙压力变化进行了模拟。分析结果表明:地基土层和地下水对人工边坡稳定性影响较大,随堆土高度增大,坡体内超孔隙压力值和增长幅度、土体位移均不断增大。潜在滑动面附近超孔隙压力增大最大可达150kPa,引起土体中有效应力降低,不利于边坡稳定,竣工1a后孔隙压力消散最大可达71%,消散速度较慢,土体固结变形稳定将至少需要1a以上时间。竣工时,原地表最大水平位移为91.2cm,最大垂直位移量为38.3cm,位于堆土厚度较大的8号监测点。工后边坡变形稳定后,堆土体内部自身压缩沉降量约为70cm。竣工后岩土体最大位移位置位于人工山体中部,岩土体中将发生一定的差异变形,不利于边坡稳定。最后采用有限元强度折减法计算得到边坡稳定性系数为1.28,与极限平衡法计算结果接近,表明本文计算结果可靠,可以作为工程设计和施工的依据。
- 人工堆山 /
- 边坡 /
- 稳定性 /
- 数值分析
Abstract: The Danshan artificial landscape hill is to be located in Zhenjiang city.The hill will be constructed on the base of the abandoned quarry and will be filled with the construction waste.The maximum of thickness of the fill soil will be 50m.The thick soft clay with low strength and high compressibility in the west foundation of the hill will have great effect on the deformation and stability of the new hill.In this paper,the stability of the artificial hill slope is calculated with numerical analysis method.The results show that foundation soil and groundwater have greater impact on the artificial slope stability.As the artificial hill height increases,the excess porewater pressure and displacement in the slope body increase.The maximum change rate of the porewater pressure values is at the middle of the slope.Near the sliding surface,the excess pore pressure will reach to 150 kPa,and reduce the soil effective stress,which does not benefit to slope stability.The dissipation of pore pressure during post-construction is about 71%after construction,which is very slow.Deformation and stability of soil consolidation will require more than one year.After the deformation is stable,the maximum horizontal displacement of the foundation soil is to be 91.2cm,the vertical displacement to 70cm.The total settlement amount of the numerical results is consistent with that from the layer-wise summation method.The stability coefficient of the slope is 1.28and is calculated with FEM strength reduction method.This value is close to the result of the Limit equilibrium method.The numerical results are reliable,which can be used as the basis for engineering design and construction.
- Artificial hill /
- Slope /
- Stability /
- Numerical analysis

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参考文献(1)

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