基于代表性取样的节理岩体抗压强度尺寸效应试验研究

doi:10.13722/j.cnki.jrme.2020.0664

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摘要不同尺寸岩体代表性取样对节理岩体强度的尺寸效应规律影响较大。基于提出的代表性取样方法，构建系列尺寸节理岩体模型，开展抗压强度尺寸效应数值模拟试验。研究结果表明：不同尺寸的岩体样本破坏模式和应力–应变曲线差别较大，通过代表性样本获得的试验结果能够较全面地反映各尺寸的破坏形态和力学特性，验证代表性取样方法的适用性；分析不同迹长和倾角的节理岩体抗压强度尺寸效应规律，发现随着尺寸的增加，峰值抗压强度逐渐减小并逐渐趋于稳定值，不同迹长和倾角减小的程度和稳定值存在差异。进一步通过尺寸效应特性分析表明，小尺寸样本抗压强度的离散性较大，大尺寸样本抗压强度的离散性较小，代表性取样方法对小尺寸样本的取样效果更明显，并能较全面地统计分析不同尺寸的节理岩体力学特性，为尺寸效应的研究提供试验方法。

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	刘丹1
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	黄曼1
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	洪陈杰1
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	陈炫男1
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	杜时贵1
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关键词 ：岩石力学, 节理岩体, 代表性取样, 尺寸效应, 抗压强度

Abstract：Representative sampling of different-size samples has a greater influence on the size effect law of jointed rock mass strength. Based on the proposed representative sampling method，series of jointed rock mass models with different sizes are constructed in this paper，and numerical simulation of the size effect on the compressive strength is carried out. The results show that the failure patterns and the stress-strain curves of rock mass samples of different sizes are quite different，and the failure mode and mechanical properties of different size rock masses are reflected by the test results obtained through representative samples，which verifies the feasibility of the representative sampling method. The size effect law of the compressive strength of jointed rock masses with different trace lengths and dip angles are analyzed，showing that the peak compressive strength gradually decreases and tends to be stable as the size increases and that different trace lengths and dip angles have different degrees of reduction in the strength. Further analysis indicates that the dispersion of the compressive strength of small-sized samples is larger while that of large-sized samples is smaller. The representative sampling method has a more obvious effect on the sampling of small-sized samples and can integrally analyze the mechanical properties of jointed rock masses of different sizes. The research work provides an experimental method for the study on size effect.

Key words： rock mechanics jointed rock mass representative sampling size effect compressive strength

引用本文:

刘丹1，2，黄曼1，2，洪陈杰1，2，陈炫男1，2，杜时贵1，2. 基于代表性取样的节理岩体抗压强度尺寸效应试验研究[J]. 岩石力学与工程学报, 2021, 40(4): 766-776.
LIU Dan1，2，HUANG Man1，2，HONG Chenjie1，2，CHEN Xuannan1，2，DU Shigui1，2 . Experimental study on size effect of compressive strength of jointed rock mass based on representative sampling. , 2021, 40(4): 766-776.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0664 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I4/766

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