基于Hoek-Brown准则对板岩抗拉强度研究

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摘要板岩等层状岩体中常存在多种结构面，岩体的抗拉强度在不同的层面倾角下会有较大的差异。为了揭示板岩这种层状岩体抗拉强度的各向异性，基于Hoek-Brown强度准则，结合巴西圆盘平面应力的弹性力学解析解，推导了圆盘随层理角度变化的抗拉强度公式。通过对不同层理角度下的试件进行单轴和巴西劈裂试验，获得了抗拉强度公式中的参数，得到了板岩抗压强度各向异性度为3.94～4.87，抗拉强度各向异性度为2.86～3.15，且抗压（抗拉）强度呈现两端大中间小的趋势。此外，该抗拉强度公式能较好地反映板岩在含有层理面时强度随变化的规律。

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	刘运思
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	张海明

关键词 ： Hoek-Brown 准则, 层理角度, 板岩, 抗拉强度

Abstract：The slate and other layered rock often have a variety of structural surfaces, and the tensile strength of the rock mass enjoys greater difference under different levels of inclination. To reveal the tensile strength anisotropy of slate, a formula for the tensile strength of disc change of bedding angle βis derived based on the Heok-Brown criterion and analytical solution of the elastic mechanics for Brazilian disc plane stress. According to the results of uniaxial and Brazilian splitting tests on samples with different bedding angles β, the following goals are achieved: the parameters of the formula for the tensile strength, the compressive strength of anisotropic degree between 3.94 and 4.87, the tensile strength of anisotropic degree between 2.86 and 3.15, and the trend of compressive (tensile) strength which reaches the maximum value in the middle and the minimum one at the two sides. In addition, the derivation of the proposed formula can explain the relationship between the tensile strength and the bedding angle. This work may provide some reference for layered rock in similar tensile state.

Key words： Hoek-Brown criterion bedding angle slate tensile strength

收稿日期: 2012-07-07

TU 458

作者简介: 刘运思(1985- )，男，湖南长沙人，博士研究生，主要从事岩石力学、边坡和隧道方面的研究工作。E-mail: liuyunsi@sohu.com。

引用本文:

刘运思, 傅鹤林, 饶军应, 董辉, 张海明. 基于Hoek-Brown准则对板岩抗拉强度研究[J]. 岩土工程学报, 2013, 35(6): 1172-1177. LIU Yun-si, FU He-lin, RAO Jun-ying, DONG Hui, ZHANG Hai-ming. Tensile strength of slate based on Heok-Brown criterion. Chinese J. Geot. Eng., 2013, 35(6): 1172-1177.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2013/V35/I6/1172

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