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坡顶建筑桩长对岩坡稳定性影响的数值分析*
黄嘉1,于德顺2,3,卢黎2,3,杨卓兴1,王连花4,胡岱文5
摘 要

(1 重庆绿城两江建筑设计有限公司, 重庆 401123; 2 重庆大学土木工程学院, 重庆 400045; 3 山地城镇建设与新技术教育部重点实验室(重庆大学), 重庆 400030;4 青岛绿城建筑设计有限公司, 青岛 266071;  5 重庆房地产职业学院, 重庆 404100)

[摘要]依托岩质边坡坡顶建筑工程实例,利用FLAC3D软件建立数值计算模型,分析了桩端进入潜在破裂面以下和位于潜在破裂面以上两种情况下,建筑岩质边坡沿潜在破裂面滑移的安全系数。通过强度折减法改变潜在破裂面的内摩擦角和黏聚力的取值,模拟计算在强度参数不同取值情况下,建筑岩质边坡的安全系数。结果表明:桩端进入潜在破裂面以下时,建筑岩质边坡的安全系数比桩端位于潜在破裂面以上时提高4倍以上。对本工程而言,桩端进入潜在破裂面以下和桩端位于潜在破裂面以上两种情况都可以满足规范对边坡安全系数要求,本工程设计具有较大的安全度。

[关键词]建筑岩质边坡; 桩基础; 潜在破裂面; 数值分析

中图分类号:TU473-1文献标识码:A文章编号:1002-848X(2017)19-0053-06

 

Numerical analysis of pile length effect on rock slope stability of building on top of slope

Huang Jia1, Yu Deshun2,3, Lu Li2,3, Yang Zhuoxing1, Wang Lianhua4, Hu Daiwen5

(1 Chongqing Liangjiang Greenton Architectural Design Co., Ltd.,  Chongqing 401123, China; 2 College of Civil Engineering, Chongqing University,Chongqing 400045, China; 3 Key Laboratory of New Technology for Construction of Cities in Mountain Area(Chongqing University), Ministry of Education, Chongqing 400030, China; 4 Qingdao Greenton Architectural Design Co.,  Ltd.,  Qingdao 266071, China; 5 Chongqing Real Estate College,Chongqing 404100, China)

Abstract:Based on the practical engineering example of building on the top of rock slope, numerical calculation model was established through FLAC3D to analyze the safety factor of the construction rock slope sliding along the potential rupture surface under the two conditions of the pile end entering below the potential failure surface and above the potential failure surface. By means of strength reduction method, the internal friction angle and cohesion value of potential failure surface were changed, and the safety factor of building rock slope was simulated and calculated under different values of strength parameters. The results show that the safety factor of the rock slope, when pile end enters below the potential failure surface, is more than 4 times higher than that under the condition that pile end enters above the potential failure surface. For this project, both the two conditions can meet the code requirements of the safety factor of the slope, and the design of this project has great safety margin.

Keywords:building rock slope; pile foundation; potential failure surface; numerical method

 

* 中央高校基本业务费项目(106112014CDJZR200010)。

 

作者简介:黄嘉,硕士,教授级高级工程师,一级注册结构工程师,Email:huangjia@gad.com.cn。

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