倾斜顶板锚索尾端剪切破坏特性及防控措施

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中图分类号：TD353 文献标识码：A

Abstract：To explore the influence of diferent inclination angles between the tail endof the anchor cable and thedriling hole on the fracture of the anchor cable，a theoretical mechanical model of the anchor cable under the shear of the tray，steel strip and other components was established.An anti-shear anchorage composed of self-aligning anchorage and anti-shear steel pipe was developed. The anti-shear performance of anchor cables using ordinary anchorage and anti-shear anchorage under diffrent inclination degrees （ 10∘ ， 20∘ ， 30∘and40∘ ）was tested. The results show that the inclination angle has a great influence on the ultimate axial force of the anchor cable. When using ordinary anchorage，the anchor efficiency of anchor cable did not reach 95% at the inclination angle of 10∘，20∘，30∘ and 40∘ . At the angle from 30∘ to 40∘ ，the axial force of the anchor cable decreases the most. With the increase of inclination angle，the failure mode of anchor cable gradually changes from tensile failure to cuting failure. When using anti-shear anchorage，the anchor efficiency at different inclination angles is greater than that of ordinary anchorage.At the inclination angle of 10∘，20∘and30∘ ，the anchor efficiency reached more than 95% . The anchoring effect is also greatly improved at an inclination angle of 40∘ ，and the average value of the peak axial force obtained by the three groups of tests is increased by 36% .The inclination angle of the tail end of the anchor cable has a great influence on the performance of the anchor cable. The use of anti-shear anchorage can effectively prevent the tail of the anchor cable from being broken by shear. The research content of this paper can provide reference for similar anchor cable failure problems.

Key words：anchor cable failure；mechanical-type anchorage；inclined roof；anti-shear anchorage

软岩大变形问题是阻碍地下工程发展的难题。（剩余9434字）