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Study on Stress-Transfer Rule of Anchoring System and Design Method of Inner-Anchoring Section

Author: FengJinJian
Tutor: HuYiFu；DengZhiBin
School: Central South University
Course: Geotechnical Engineering
Keywords: Prestressed anchor rope the law of load transferring anchored stress-dike shear-stress distribution anchorage cohesive strength bonding length design method
CLC: TU476
Type: Master's thesis
Year: 2009
Downloads: 18
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Abstract


In order to research into the law of the prestressed anchor’s load transferring and the method about designing prestressed anchor which according to the fact, several means were adopted in this thesis to analyze and study thoroughly. The main study works are as following:1. The law of load transferring on the surface of rockmass with single anchor and compound anchors was researched by using the half space theory of the elasticity, and the pier dimension of anchor, prestressed size, anchor spacing and other factors of influences on stress distribution patterns were analyzed. The FLAC3D was used to verify that.2. The concept of anchored stress-dike was clarified based on the stress distributing law of compound anchors, and the effective thickness formula of anchored stress-dike was proposed. The reinforcement design method of cable spacing and non-stressed zone was explored.3. The shear stress distribution of prestressed cables anchor was studied, and the influencing factors such as load, rock and soil property and diameter of anchorage were analyzed. The ultimate pull-out force were considered in condition that interface was failed.4. Current methods to determine anchorage cohesive strength were compared. The effects of high-pressure grouting and roughness of hole side were considered and the amendments on the formula was proposed.5. By using the conclusion of theoretical analysis, the orthodox method of designing anchor rope that based on the hypothesis of shearing strength uniform distributing was modified, a new and more reasonable method about designing the length of anchoring section was presented.

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