基于明德林解的土钉内力计算方法

›› 2011, Vol. 32 ›› Issue (S1): 6-14.

基于明德林解的土钉内力计算方法

魏焕卫¹，宋丰波²，杨敏³，孙剑平¹

1. 山东建筑大学土木工程学院，济南 250014；2. 山东电力工程咨询院有限公司，济南 250013；3. 同济大学地下建筑与工程系，上海 200092

收稿日期:2010-11-22 出版日期:2011-05-15 发布日期:2011-05-16
作者简介:魏焕卫，男，1974年生，博士，副教授，主要从事岩土工程共同作用和变形控制设计研究

Calculation method of inner force of soil nailing based on Mindlin solution

WEI Huan-wei¹, SONG Feng-bo², YANG Min³, SUN Jian-ping¹

1. School of Civil Engineering, Shangdong Jianzhu University, Ji’nan 250014, China; 2. Shandong Electric Power Engineering Consulting Institute Corp., Ltd., Ji’nan 250013, China; 3. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

Received:2010-11-22 Online:2011-05-15 Published:2011-05-16

摘要/Abstract

摘要： 土钉内力计算是土钉墙设计计算的关键指标，通过虚拟开挖应力模拟土钉墙开挖状态，假定面层受力为0，提出了钉土剪力在潜在滑动面两侧沿土钉方向呈双三角形分布的计算模型，推导了钉土剪力和土钉轴力的计算公式。利用Mindlin应变解，得到在虚拟开挖应力和钉土剪力共同作用下潜在滑动面位置土体及土钉端部土体侧向位移，根据钉土剪力分布模型计算得到土钉在潜在滑动面位置的弹性变形。根据钉土剪力在潜在滑动面位置等于0的特点，得到钉土相对位移在潜在滑动面位置为0的结论，结合潜在滑动面位置两侧土钉轴力大小、相等方向相反，可以得到钉土剪应力计算公式中未知系数，从而得到土钉轴力和钉土剪力。通过与法国CEBTP大型试验1号墙实测数据的对比分析，初步验证了基于Mindlin解的土钉内力计算方法的合理性和可行性。

关键词: 侧向土压力, Mindlin解, 潜在破裂面, 钉土剪力, 土钉轴力

Abstract: Inner force of soil nail is a key parameter of soil nailing design. Virtual excavation stress is used to simulate the excavation status of soil nailing. On the basis of the hypothesis that there exists no load on the face of soil nail, a calculation model is presented that the distribution of shear forces between soil and nail is double-triangle. The calculation formulas of axial force and shear force of soil nail are derived. The lateral displacement of soil at potential break surface and the end of nail by the virtual excavation of soil shear stress is obtained based on Mindlin strain solution. The zero relative displacement and the equivalent axial force of soil nail at both sides of potential break surface can provide two equations for two unknown coefficients of the calculation model. The measured data from French research test on soil nailing are used to illustrate the validity of the proposed calculation model

Key words: lateral soil pressure, Mindlin strain solution, potential break surface, shear force between soil and nail, axial force of soil nail

中图分类号:

TU 432

魏焕卫，宋丰波，杨敏，孙剑平. 基于明德林解的土钉内力计算方法[J]. , 2011, 32(S1): 6-14.

WEI Huan-wei, SONG Feng-bo, YANG Min, SUN Jian-ping. Calculation method of inner force of soil nailing based on Mindlin solution[J]. , 2011, 32(S1): 6-14.

参考文献

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