含预制裂隙类岩石裂隙演化与破裂特征的试验研究

doi:10.11872/j.issn.1005-2518.2020.03.164

摘要/Abstract

摘要：

裂隙岩体是自然界中普遍存在的工程岩体，在外力作用下易引起岩体结构破坏失稳而诱发工程故事。为此，基于相似理论制作了含十字交叉裂隙的类岩石试样，利用RMT-150B岩石力学试验机，对含有不同裂隙长度和裂隙倾角的类岩石试样进行单轴压缩试验，分析其裂隙演化规律和破裂特征。研究结果表明：含预制裂隙试样的抗压强度明显低于完整试块；当主裂隙长度一定时，裂隙岩样的峰值应力随次裂隙长度的增大而降低；当裂隙倾角为0°和60°时，裂隙岩样表现为拉伸型翼形裂纹的破坏形式；当裂隙倾角为30°和45°时，裂隙岩样表现为拉剪混合型裂纹的破坏形式，既有翼形裂纹，又有次生共面裂纹。

关键词: 类岩石, 十字交叉裂隙, 裂隙演化, 裂隙破坏特征, 单轴压缩试验

Abstract:

Fracture rock mass is a kind of engineering rock mass widely existing in nature，which is easy to cause structural failure and instability of rock mass and induce engineering accidents under the action of external force.Therefore，it is necessary to study the crack evolution law and the fracture instability mechanism of rock mass with prefabricated fractures.In this paper，a lot of rock-like samples with prefabricated crisscross cracks were made based on the similarity theory.The uniaxial compression test on the rock-like samples with different fracture length and inclination angles were carried out by using the RMT-150B rock mechanics testing machine，and crack evolution law and fracture characteristics were analyzed.The research results show that the compressive strength of the samples with crisscross crack is significantly lower than that of the intact. The peak stress decreases with the increase of secondary crack length when the principal crack length of the sample is constant. The failure mode of the sample contain crisscross crack with the dip angle are 0° and 60° respectively shows the tensile wing cracks.The failure mode of the specimen contain crisscross crack with the dip angle are 30° and 45° respectively shows the tensile-shear mixed cracks, which have both wing-shaped cracks and se-condary coplanar cracks.

Key words: rock-like, criss-cross fractures, fracture evolution, fracture failure characteristics, uniaxial compression test

中图分类号:

TD85

王程程, 罗鑫尧, 陈科旭, 戴兵, 贺桂成. 含预制裂隙类岩石裂隙演化与破裂特征的试验研究[J]. 黄金科学技术, 2020, 28(3): 421-429.

Chengcheng WANG, Xinyao LUO, Kexu CHEN, Bing DAI, Guicheng HE. Experimental Study on Crack Evolution and Fracture Characteristics of Rocks with Prefabricated Cracks[J]. Gold Science and Technology, 2020, 28(3): 421-429.

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编号	主、次裂隙长度（L₁×L₂）/（mm×mm）	十字裂隙角度/（°）	编号	主、次裂隙长度（L₁×L₂）/（mm×mm）	十字裂隙角度/（°）	编号	主、次裂隙长度（L₁×L₂）/（mm×mm）	十字裂隙角度/（°）
A11	10×10	0	A21	20×10	0	A31	30×10	0
B11	10×10	30	B21	20×10	30	B31	30×10	30
C11	10×10	45	C21	20×10	45	C31	30×10	45
D11	10×10	60	D21	20×10	60	D31	30×10	60
A12	10×20	0	A22	20×20	0	A32	30×20	0
B12	10×20	30	B22	20×20	30	B32	30×20	30
C12	10×20	45	C22	20×20	45	C32	30×20	45
D12	10×20	60	D22	20×20	60	D32	30×20	60
A13	10×30	0	A23	20×30	0	A33	30×30	0
B13	10×30	30	B23	20×30	30	B33	30×30	30
C13	10×30	45	C23	20×30	45	C33	30×30	45
D13	10×30	60	D23	20×30	60	D33	30×30	60

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