摘要
在深基坑预应力锚索现场试验基础上,通过实测数据分析,提出在特定黄土地层中,当锚索锚固段长度设置合理时,其锚固段极限黏结强度标准值可高于现行规范推荐值。从试验锚索的不同荷载位移曲线,显现出预应力锚索在黄土地层中和其他黏性土地层中基本一致的受荷服役工况和荷载传递变化情况,试验曲线直观清晰地反映了每级张拉荷载下锚索的工作状态,并通过试验数据得到了相关拟合式。最后从试验数据反算锚索刚度并与现行规范推荐计算公式进行比较,得到一些有益结论。研究成果可以为黄土地区深基坑预应力锚索的设计、施工等提供参考。
Based on field test of pre-stressed anchor cables in deep excavations,The standard value of the ultimate bond strength in anchorage section is analyzed and calculated through measured data. It is higher than the current standard in certain loess layer when the anchor cable length is set properly. From the different load displacement curves of the test anchor cables, the pre-stressed anchor cables in loess layers and other viscous layers are basically consistent in the service conditions and load transfer, the working state of the anchor cable is reflected clearly in the curves of the test under the tension load of each stage, and the relevant fitting formula is obtained through experimental data and curves. In the end, the rigidity of the anchor cables is reverse calculated with the test data and is compared with the current standard, some beneficial results are obtained. The results can provide references for the design and construction of deep excavations in loess layers.
作者
王小勇
王勇华
张继文
Wang Xiaoyong;Wang Yonghua;Zhang Jiwen(China Jikan Research Institute of Engineering Investigations and Design, Co., Ltd., Xi'an 710043, Shaanxi, China)
出处
《岩土工程技术》
2019年第2期121-124,F0003,共5页
Geotechnical Engineering Technique
基金
中国机械设备工程股份有限公司科技研发基金支持课题(CMEC-KJYF-2017-07)
关键词
黄土地层
深基坑
预应力锚索
现场试验
黏结强度
刚度
loess layer
deep excavations
pre-stressed anchor cables
field tests
bonding strength
rigidity
