拉力型锚索在黄土层中的荷载传递机理

兰州理工大学学报 ›› 2020, Vol. 46 ›› Issue (5): 124-129.

拉力型锚索在黄土层中的荷载传递机理

王勇华, 王小勇, 张继文

机械工业勘察设计研究院有限公司, 陕西西安 710043

收稿日期:2019-08-07 出版日期:2020-10-28 发布日期:2020-11-06
作者简介:王勇华(1978-),男,陕西西安人,高级工程师.

Load transfer mechanism of tension-type anchor cable in the loess layer

WANG Yong-hua, WANG Xiao-yong, ZHANG Ji-wen

China Jikan Research Institute of Engineering Investigations and Design, Co., Ltd. Xi'an 710043, China

Received:2019-08-07 Online:2020-10-28 Published:2020-11-06

摘要/Abstract

摘要： 在前人研究成果与合理的假设的基础上,分析拉力型锚索在黄土地区的荷载传递机理,得到黄土地层中拉力型锚索的临界锚固段长度理论计算公式,并分析各参数变化对临界锚固段长度的影响规律.依据现行规范要求,试验验证黄土地区深基坑桩锚支护体系临界锚固段长度理论公式的合理性.实测数据分析表明,在黄土地层条件下,通过锚索锚固段的合理设置,其锚固段极限黏结强度取值可高于现行规范推荐值.试验锚索的荷载位移曲线验证了黄土地层中拉力型锚索的不同受荷服役工况和荷载传递变化情况,反映了各级张拉荷载下锚索的工作状态.研究成果可为黄土地区拉力型锚索的设计及现场试验提供指导.

关键词: 黄土地层, 拉力型锚索, 临界锚固段长度, 试验, 弹塑性

Abstract: On the basis of previous research achievements and reasonable assumptions, load transfer mechanism of tension-type anchor cable in loess area is analyzed,and a theoretical calculation formula of the critical anchorage length of tension-type anchor cable in loess stratum is obtained. The influence of various parameters on the critical anchorage length is analyzed either. According to requirements of the current code, the rationality of the theoretical formula of the critical anchorage length of pile-anchor support system for deep foundation pit in loess area has been verified by our experiments. According to requirements of the current code, our tests have verified rationality of the theoretical formula of the critical anchoring section length of the pile-anchor support system of the deep foundation pit in the loess area. Analyses to measured data show that under condition of loess stratum, through the reasonable setting of the anchoring section of the anchor cable, the ultimate bond strength of the anchoring section can be higher than that recommended by the current code. The load-displacement curve of the tested anchor cable verifies different load service conditions and load transfer changes of the tension-type anchor cable in the loess stratum, which reflects the working state of the anchor cable under all levels of tension load. Our achievements of this study can provide guidance for the design and field test of tension-type anchor cable in loess layer.

Key words: loess layer, tension-type anchor cable, critical anchorage length, experiment, elastic-plastic

中图分类号:

TU41
TU43

王勇华, 王小勇, 张继文. 拉力型锚索在黄土层中的荷载传递机理[J]. 兰州理工大学学报, 2020, 46(5): 124-129.

WANG Yong-hua, WANG Xiao-yong, ZHANG Ji-wen. Load transfer mechanism of tension-type anchor cable in the loess layer[J]. Journal of Lanzhou University of Technology, 2020, 46(5): 124-129.

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