施工期间人工挖孔桩桩间土稳定性分析

›› 2013, Vol. 34 ›› Issue (5): 1443-1448.

施工期间人工挖孔桩桩间土稳定性分析

曹贤发1，张家生1，刘之葵2，徐进3

1. 中南大学土木工程学院，长沙 410075；2. 桂林理工大学土木与建筑工程学院，广西桂林，541004； 3. 马克菲尔（长沙）新型支档科技开发有限公司，长沙 410001

收稿日期:2012-03-09 出版日期:2013-05-10 发布日期:2013-05-14
通讯作者: 张家生，男，1964年生，博士，教授，博士生导师，主要从事岩土力学、岩土边坡以及爆破控制方面的研究工作。 E-mail: jszhang_csu@vip.163.com E-mail: caoxianfa@126.com
作者简介:曹贤发，男，1980年生，博士研究生，国家注册岩土工程师，主要从事岩土力学、岩溶工程地质方面的研究工作
基金资助:
国家自然科学基金项目(No.51169004)。

Stability analysis of soil between manual digging piles during construction

CAO Xian-fa1，ZHANG Jia-sheng1，LIU Zhi-kui2，XU Jin3

1. School of Civil Engineering, Central South University, Changsha 410075, China; 2. College of Civil Engineering and Architecture, Guilin University of Technology, Guilin, Guangxi 541004, China; 3. Maccaferri (Changsha) Enviro-Tech. Co., Ltd., Changsha 410001, China

Received:2012-03-09 Online:2013-05-10 Published:2013-05-14

摘要/Abstract

摘要： 为预防人工挖孔桩窜孔，探讨了桩间土失稳机制，分析了桩间土失稳时的位移特征，建立了桩间土稳定性分析的力学模型，推导了桩间土稳定系数及安全桩净距的计算公式，提出了窜孔防治措施建议。结果表明，桩间土失稳时，滑动土体位移平行于桩心连线，其宽度等于两桩桩径较小值；桩间土稳定系数与滑动土体宽度及埋深成反比，与桩净距成正比，随滑动层的抗剪强度及残余抗剪强度增大而增大，而滑动层厚度则存在一个最不利值，可通过试算确定；控制桩孔间的混凝土面高差、增大桩孔开挖净距、加强护壁，减少桩间土的扰动等是防治窜孔的有效措施。工程实例表明，桩间土稳定性评价方法合理、实用，可为黏性土场地的人工挖孔桩施工提供参考。

关键词: 人工挖孔桩, 桩间土, 稳定系数, 安全桩净距

Abstract: To prevent the accident of fleeing bore during manual digging pile construction, the instability mechanism of soil between manual digging piles is discussed; then the feature of displacement in instability is analyzed; a stability analysis mechanical model is established; formulas for the stability coefficient and critical value of pile spacing are derived; and some suggestions for fleeing bore prevention are provided. The results show that during the instability of soil between piles, the sliding soil displacement parallels to the line through the two pile centers and its width is equal to minimum of diameters of the two piles. While the most disadvantageous value of the thickness of the sliding soil could be determined by repeated calculation, the stability coefficient of soil between piles is inversely proportional to the width and the depth of the sliding soil, is proportional to the pile spacing, and rises with increasing of the shear strength and residual shear strength of the sliding soil. Controlling the concrete height difference between two pile holes, increasing the pile spacing, strengthening the lining structures, and reducing disturbance of soil between piles, are the most effective measures for fleeing bore prevention. Engineering practice has proved that the stability analysis method of soil between manual digging piles is reasonable and practical; so as to provide reference for manual digging pile construction in cohesive soil-based site.

Key words: manual digging pile, soil between piles, stability coefficient, critical value of pile spacing

中图分类号:

TU 432

曹贤发1，张家生1，刘之葵2，徐进3. 施工期间人工挖孔桩桩间土稳定性分析[J]. , 2013, 34(5): 1443-1448.

CAO Xian-fa1，ZHANG Jia-sheng1，LIU Zhi-kui2，XU Jin3. Stability analysis of soil between manual digging piles during construction[J]. , 2013, 34(5): 1443-1448.

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