考虑法向应力与岩石强度的加锚节理岩体剪切力学模型研究

doi:10.13722/j.cnki.jrme.2022.0942

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Abstract In order to analyze the influence of normal stress and rock strength on anchor bolt anchoring mechanism，three representative rocks，namely red sandstone，limestone and basalt，were selected to carry out direct shear tests of jointed rock mass under different normal stress levels. Based on the test results，according to the statically determinate beam theory and the principle of minimum complementary energy，this paper establishes a shear strength model of joint surface which considers the effect of rock structure and equivalent shear area. And combined with the theoretical calculation formula，this paper analyzes the influence law of rock strength on the axial force and shear force under different anchorage angles. The research shows the anchoring effect of anchor bolts is shown as increasing the equivalent internal friction angle and cohesion of joint surface，and that the greater the rock strength，the greater the contribution of the bolt to the shear strength of the joint plane. Compared with the experimental data and the existing analytical model，the calculated values of the theoretical model are more consistent with the experimental results. Through calculation and analysis，it can be seen that with the increase of the anchorage angle，the contribution of the axial force of the bolt to the shear strength of the joint surface gradually decreases，while the contribution of the shear force to the shear strength of the joint surface gradually increases，and the optimal anchorage angle of the bolt is within the range of 50°to 70°.

Key words： rock mechanics anchoring joint surface rock strength anchoring effect cohesion internal friction angle

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	Articles by authors
	SONG Yang1
	FAN Bo2
	WANG Heping2

Cite this article:

SONG Yang1,FAN Bo2,WANG Heping2. Research on shear mechanics model of anchored-jointed rock mass#br# considering normal stress and rock strength[J]. , 2023, 42(6): 1325-1335.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0942 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I6/1325

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