Analysis of torque on helical soil nail drilling into strata

被引：3
作者：
Li, Zhi-Ning [1 ]
Han, Tong-Chun [1 ]
Dou, Hong-Qiang [1 ]
Qiu, Zi-Yi [1 ]
机构：
[1] Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2015年 / 49卷 / 08期
关键词：
Helical soil nail; Shear strength of soil; The critical effective length; Torque; Wood-plastic-composites (WPC);
D O I：
10.3785/j.issn.1008-973X.2015.08.004
中图分类号：
学科分类号：
摘要：
The field experiments were done to study the forces on wood-plastic-composites (WPC) helical soil nail drilling into soil strata. A formula of the drilling torque was derived according to the experimental data. The experimental and analytical results showed that the drilling process of helical soil nail was affected by many factors, such as effective length of soil nail in the strata, width of screw thread, diameter of soil nail, pitch of screw thread and soil properties. Results show that the shorter the effective length of soil nail in the strata and the smaller the width of screw thread, the lower the needed torque. The smaller the rod body diameter and the bigger the screw thread diameter, the lower the needed torque. The minimum torque occurs when pitch of screw thread is slightly larger than the diameter of screw thread. It is difficult for WPC helical soil nail to drill in hard soil so that it is suitable for soft soil. ©, 2015, Zhejiang University. All right reserved.
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页码：1426 / 1433
页数：7
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