压力分散型锚索锚固段荷载分布特征的现场试验研究

›› 2011, Vol. 32 ›› Issue (12): 3561-3565.

压力分散型锚索锚固段荷载分布特征的现场试验研究

叶观宝^{1, 2}，何志宇^{1, 2}，高彦斌^{1, 2}，马冬梅³，仲伟涛³

1.同济大学地下建筑与工程系，上海 200092；2.同济大学岩土及地下工程教育部重点实验室，上海 200092； 3.连云港市航道管理处，江苏连云港 222004

收稿日期:2010-06-08 出版日期:2011-12-10 发布日期:2011-12-13
作者简介:叶观宝，男，1964年生，博士，教授，博士生导师，主要从事岩土加固与测试技术的研究
基金资助:
上海市重点学科建设项目（No. B308）；江苏省交通厅科研项目（No. 09Y26）

Field test study of load distribution of anchoring section of pressure dispersed anchor cables

YE Guan-bao^{1, 2}, HE Zhi-yu^{1, 2}, GAO Yan-bin^{1, 2}, MA Dong-mei³, ZHONG Wei-tao³

1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Lianyungang Waterway Administration Office, Lianyungang, Jiangsu 222004, China

Received:2010-06-08 Online:2011-12-10 Published:2011-12-13

摘要/Abstract

摘要： 根据压力分散型锚索的设计理念，研究外部荷载作用下锚索锚固段各单元体中的荷载分布特征与有效受压锚固长度，为压力分散型锚索的锚固支护提供设计依据。试验锚索全长为32 m，锚固段长为18 m，各单元体长度均为4.5 m，通过在锚索锚固段安装微型高灵敏度应变传感器的试验方法，得到锚索锚固段的荷载传递规律与分布特征。试验结果表明：依据现有锚索规程中对压力分散型锚索的张拉方法，锚索各单元体并未起到均匀分担外部荷载的作用。随着外部荷载的逐渐增大，位于锚固段中间部位的第2单元体与第3单元体的受荷值要明显高于两端第1单元体与第4单元体的受荷值。锚索锚固段也并不是完全处于轴向受压状态，且各单元体的有效受压锚固长度也并不相等，第1～4单元体有效受压锚固长度分别为1.5、2.9、2.8、4.5 m，有效受压锚固长度整体分布特征表现为第1单元体第2单元体第4单元体，而第2单元体与第3单元体的有效受压锚固长度相近。

关键词: 压力分散型锚索, 单元体, 受荷值, 有效受压锚固长度

Abstract: According to the design concept of pressure dispersed anchor cables, load distribution and effective compression anchorage length of pressure dispersed anchor cables of each unit body are tested under the effect of external load, so as to provide design reference for anchorage support design of anchor cables. In field test, the experimental anchor cables have the total length of 32 m, anchoring section’s length of 18 m which is divided into four segments; and have 200 mm diameter hole. By the method of installing micro strain sensor with high sensitivity at the position of anchoring section, load transfer law and distribution of anchoring section are obtained. Test results show that: each unit body of pressure dispersed anchor cables did not shared external load uniformly in accordance with the required standards of the existing regulation. With the increase of external load, load value which located at the position of the second unit body and the third unit body is significantly higher than the load value located at the position of the first unit body and the fourth unit body. The condition of anchoring section is not completely compressed; and the effective compressed anchoring length is also not equal, which the effective length of the first unit body, second unit body, third unit body and fourth unit body are respectively 1.9 m, 2.9 m, 2.8 m and 4.5 m. The distribution law of effective compressed anchoring length of each unit body is the first unit body the second unit bod the fourth unit body, and the effective compressed anchoring length of the second unit body is close to the third unit body.

Key words: pressure dispersed anchor cables, unit body, load value, effective compressed anchoring length

中图分类号:

TU 317

叶观宝，何志宇，高彦斌，马冬梅，仲伟涛. 压力分散型锚索锚固段荷载分布特征的现场试验研究[J]. , 2011, 32(12): 3561-3565.

YE Guan-bao , HE Zhi-yu , GAO Yan-bin , MA Dong-mei , ZHONG Wei-tao. Field test study of load distribution of anchoring section of pressure dispersed anchor cables[J]. , 2011, 32(12): 3561-3565.

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