承压片理化岩石各向同性转换的临界围压条件

doi:10.13722/j.cnki.jrme.2022.0265

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摘要岩石的各向异性随着围压增加逐渐弱化甚至消失，对岩石向各向同性转换的临界条件尚缺乏深入研究。以片理化岩石为对象，总结这类典型各向异性岩石的组构特征，构建沿弱面剪切滑移破坏的经验准则，结合建立在临界状态概念与莫尔–库仑准则基础上的岩石破坏判据，理论预测了片理化岩石的各向同性转换围压，并通过对前人试验数据的统计分析予以验证。结果表明：具代表性的层状硅酸盐矿物构成片理化岩石内的定向软弱层，并与粒状矿物构成的坚硬层呈似互层状分布；在一定加载方向下，片理化岩石可产生沿弱面剪切滑移破坏，此破坏模式下岩石的经验摩擦因数分别为0.40(中、低围压)、0.25(高围压)；各向同性转换围压与垂直片理面加载时的岩石单轴抗压强度和内摩擦角有关，片理化岩石的转换围压常大于1.5 ，并随着和的增加而增大；当层状硅酸盐矿物含量较高时，片理化岩石的各向同性转换围压系数往往在1.9～3.6范围。

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	尹晓萌1
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	晏鄂川2
	李凌3
	马超4

关键词 ：岩石力学, 片理化岩石, 层状硅酸盐矿物, 各向异性, 转换围压

Abstract：Abstract：The anisotropy of rock gradually weakens or even disappears with increasing the confining pressure. However，the critical condition for the transformation from anisotropic to isotropy is still lack of in-depth research. Taking foliated rocks as the object，the fabric characteristics of this kind of typical anisotropic rock were summarized and the empirical criterion for shear-slip failure along the weak plane of rock was constructed. Combined with the previous failure criterion created based on the concept of critical state and Mohr-Coulomb criterion，the critical confining pressure at the point where the anisotropy of foliated rock is transformed into isotropy was predicted theoretically. Then，the prediction result was verified by statistical analysis on previous experimental data. The results are as follows. Foliated rocks contain representative phyllosilicates，which constitute directional weak layers and are distributed in a quasi interbedded manner with the hard layers composed of granular minerals. Under a certain loading direction，foliated rocks suffer shear-slip failure along the weak plane. The empirical friction coefficients of rocks in this failure mode are 0.40 and 0.25 under the conditions of medium-low and high confining pressure respectively. The transformation confining pressure is dependent on the uniaxial compressive strength and internal friction angle of foliated rocks subjected to compressive loading perpendicular to weak planes. The transformation confining pressure of foliated rocks is generally greater than 1.5 and increases with the increase of and . For the foliated rocks with a high content of phyllosilicates，the transformation confining pressure coefficient is often between 1.9 and 3.6.

Key words： rock mechanics foliated rock phyllosilicates anisotropy transformation confining pressure

引用本文:

尹晓萌1，2，晏鄂川2，李凌3，马超4. 承压片理化岩石各向同性转换的临界围压条件 [J]. 岩石力学与工程学报, 2023, 42(2): 403-412.
YIN Xiaomeng1，2，YAN Echuan2，LI Ling3，MA Chao4. Critical confining pressure condition for isotropic transformation of foliated rocks under compressive loads . , 2023, 42(2): 403-412.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0265 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I2/403

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