FLAC3D中锚杆破断失效的实现及应用

doi:10.13722/j.cnki.jrme.2015.0060

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Abstract In order to solve the problem that CABLE element in FLAC3D cannot be broken failure，a broken criterion U(i)≥Umax(i) was proposed and a modified mechanical model of CABLE element was established. The broken failure function was added to the modified model and the new model was embedded in the main program of FLAC3D with the FISH language programming. The broken failure of bolt was realized at the single element level，and the macroscopic broken was finally achieved from parts to whole spontaneously. The tensile tests of bolt bar and the roadway bolt-shotcrete support tests were carried out. The load-displacement curve of the cable bar using the modified model presented the broken failure characteristic，which was in accordance with the actual mechanical behavior of bolt rod，and the quantitative broken effect was achieved and the response was sensitive. When the ground stress exceeded a certain value，the modified bolts and anchor cables broke in the surrounding rock，the mechanical behavior conformed to the broken failure mechanism of bolt or cable anchor in the practical engineering. The simulation accuracy was improved. The application range of FLAC3D was expanded，and the simulation capability was enhanced.

Key words： geotechnical engineering FLAC3D bolts cable anchors CABLE element broken modified model

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.0060 OR http://www.rockmech.org/EN/Y2016/V35/I04/753

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