压力分散型锚索设计中应考虑的几个问题

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Abstract On the analysis of anchoring mechanism for compression dispersion-type anchor cable，three problems that should be considered in the anchor cable design have been put forward，namely the calculation of unit anchor length，the deformation of grouting body near pressure plate and the nonuniform loads of steel strand wires caused by the rock mass deformation after slope completed. The anchorage force has been improved to compare with tension type anchor cable，because the radial expansion deformation of grouting body is restrained by the rock mass. The hard the rock mass is，the stronger the restriction is；and the more the improved anchorage force，otherwise，the smaller. A formula for calculating anchoring length，of which the physical concept is clear and calculation simple，is presented，together with the formula to determine the deformation of the grouting body near pressure plate. In order to eliminate the nonuniform loads，the anchor cable tension method is recommended，in which rock mass permitted displacement after slope completed is considered；and the detailed tension order and the calculation formulas are also given.

Key words： geotechnical engineering compression dispersion-type anchor cable deformation of grouting body unit anchoring length deformation after slope completed

Received: 11 July 2012

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I8/1513

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