基于含石量指标的土石混合体非线性破坏强度准则

doi:10.13722/j.cnki.jrme.2020.0854

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Abstract The composition contents of the quaternary soil-rock mixture(SRM) have a significant impact on the structural characteristics and play a decisive role in the strength of the typical two-phase geo-material. The increase of the rock block proportion(RBP) leads to the emergence of the soil-rock interfaces with a weak strength，and in the meanwhile，the added rock blocks change the transmission path of the force system and are more capable to bear force effect than the soil matrix. The studies on the empirical strength theory of SRM are still limited. This study picks the SRM in the density state as the research target，and pays attention to the influence of the soil-rock-interface system on the strength. Base on the similarities in mechanical properties and constituent structures between the medium and high RBPs and fractured rock masses，the calculation format and empirical parameter selection method of Hoek-Brown criterion were considered to build the non-linear strength criterion of SRM for describing the mechanical characteristics of the material. The RBP，the unconfined compression strength，the characteristic parameter A，the disturbed parameter and the geological parameter G were chosen to reflect the impacts of the RBP，the strength of the soil-rock interface and the mechanical properties of the compositions on the SRM strength. The fitting formulae of the experience parameters ms and a were promoted based on the large triaxial test data collected from previous studies，and the accuracy of the established criterion was also proved using the test data in the database. The results show that the non-linear criterion proposed in this study can describe the non-linear strength characteristics of SRM with various rock block proportions. The predicted major principle stress values are divided into test fitting value and formula fitting value according to the approaches for obtaining the experience parameters of the proposed criterion. The test fitting values are much more precise than the formula fitting values compared with the test results. The predicted values of the two methods are consistent with the test results with coefficients of correlation greater than 0.9. The non-linear criterion developed in this study is much more suitable and accurate for the SRM with a higher rock block proportion，while the accuracy is relatively poor for the SRM with a low proportion in contrast with the Mohr-Coulomb criterion. The research results can provide calculation references for the strength estimation of natural SRM in engineering practice.

Key words： soil mechanics soil-rock mixture Hoek-Brown criterion non-linear strength criterion rock block proportion large scale triaxial test

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	ZHANG Zhenping1
	2
	FU Xiaodong1
	2
	SHENG Qian1
	2
	YIN Dawei3
	4
	SONG Dingfeng3
	4
	DU Yuxiang5

Cite this article:

ZHANG Zhenping1,2,FU Xiaodong1, et al. A non-linear ultimate strength criterion for soil-rock mixture based on rock block proportion[J]. , 2021, 40(8): 1672-1686.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0854 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/I8/1672

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