土钉支护结构变形与稳定性关系探讨

›› 2014, Vol. 35 ›› Issue (1): 238-247.

土钉支护结构变形与稳定性关系探讨

张玉成^{1, 2, 3}，杨光华^{1, 2, 3}，吴舒界⁴，姚丽娜⁵，钟志辉⁶

1. 广东省水利水电科学研究院，广州 510610；2. 广东省岩土工程技术研究中心，广州 510610；3. 广东省突发公共事件应急技术研究中心，广州 510610；4. 厦门华岩勘测设计有限公司，福建厦门 361004；5. 华南理工大学土木与交通学院，广州 510641； 6. 武汉大学土木建筑工程学院，武汉 430072

收稿日期:2013-02-18 出版日期:2014-01-10 发布日期:2014-01-14
作者简介:张玉成，男，1975年生，博士后，高级工程师，主要从事岩土工程方面的科研、咨询和设计的工作。
基金资助:
国家自然科学基金(No. 51378131)

Discussion on relationship between deformation and stability of soil nailing structure

ZHANG Yu-cheng^{1, 2, 3}，YANG Guang-hua^{1, 2, 3}，WU Shu-jie⁴，YAO Li-na⁵，ZHONG ZHi-hui⁶

1. Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510610, China; 2. The Geotechnical Engineering Technology Center of Guangdong Province, Guangzhou 510610, China; 3. The Emergency Technology Research Centre of Guangdong Province for Public Events, Guangzhou 510610, China; 4. Xiamen Huayan Reconnaissance & Design Co., Ltd., Xiamen, Fujian 361004, China; 5. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China; 6. School of Civil and Architectural Engineering, Wuhan University, Wuhan 430072, China

Received:2013-02-18 Online:2014-01-10 Published:2014-01-14

摘要/Abstract

摘要： 土钉支护因其施工简单、造价低、工期短和施工技术成熟等优点，在工程中得到广泛应用，但目前其设计计算理论缺乏，且现行规范给出的变形允许值存在不足，如现行土钉规范（规程）仅是简单地规定一个变形允许值，没有结合基坑的特点、支护类型、周边环境等因素来规定，更没有将基坑的变形与基坑稳定联系起来综合确定其监测指标预警值等，因此，导致这种性价比很好的支护技术有减少应用的趋势。利用变模量强度折减法对土钉支护变形和稳定关系进行了探讨性研究，经大量的计算分析，给出了土钉支护的变形与稳定统一判定指标——位高比，且计算发现，同一种土质、同一稳定系数K对应的不同高度H的位高比几乎相等。给出了一定强度和一定深度土钉支护位移预警值和最大位移允许值，利用给出的表格，可直接确定其位移预警值和最大位移允许值，便于工程师应用，也为实际土钉支护结构确定变形预警值提供了参考。提出的方法不仅能够确定土钉支护结构变形值，且对类似支护结构确定变形值也提供了一种方法和思路，对推进基坑规范完善和改进具有一定的参考和借鉴作用。

关键词: 基坑, 土钉, 强度折减法, 位高比, 稳定性

Abstract: Because of the advantages such as easy construction, low cost, short construction period and mature construction techniques, soil nailing has been widely used in engineering. However, at present there is lacks of the calculation theory of soil nailing, and shortages also exist in allowable deformation values specified by current specifications. For example, current soil nailing specifications just simply specify an allowable deformation value without considering features of foundation pit, supporting types and surroundings; and these specifications also determine the early warning value for monitoring without combining the deformation with the stability of foundation pits. Thus, these shortages lead to the downward trend of usage of soil nailing that has good performance-price ratio in fact. Based on this, the variable modulus strength reduction method to investigate the relation between deformation and stability of soil nailing is used. After a large number of computational analyses, the comprehensive identification index-deformation-height ratio is given for deformation and stability of soil nailing. It is found from the computational results that for the same soil and the same stability factor k, the deformation-height ratios of different heights H are nearly the same. Also, the early warning displacement and the maximum allowable displacement are proposed for certain strength and depth of soil nailing structure. Using the tables can determine the early warning displacement and the maximum allowable displacement, which is convenient for engineering application. A specific project proves the reasonableness of these results; and these results can also give reference for deformation early warning values of actual soil nailing structure. This paper could not only determine the deformation of soil nailing structure, but also offer a new method and idea to determine deformation of similar supporting structures, which has some significance for improving the specifications of foundation pits.

Key words: foundation pit, soil nailing, strength reduction method, deformation-height ratio, stability

中图分类号:

TU 470

张玉成，杨光华，吴舒界，姚丽娜，钟志辉,. 土钉支护结构变形与稳定性关系探讨[J]. , 2014, 35(1): 238-247.

ZHANG Yu-cheng ，YANG Guang-hua ，WU Shu-jie ，YAO Li-na ，ZHONG ZHi-hui,. Discussion on relationship between deformation and stability of soil nailing structure[J]. , 2014, 35(1): 238-247.

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