单侧限压缩下预制裂隙试样力学特性及板裂化
机制细观研究

doi:10.16285/j.rsm.2017.2597

岩土力学 ›› 2018, Vol. 39 ›› Issue (12): 4385-4394.doi: 10.16285/j.rsm.2017.2597

单侧限压缩下预制裂隙试样力学特性及板裂化机制细观研究

周喻¹，孙铮¹，王莉²，王宇¹，丁银平³

1. 北京科技大学金属矿山高效开采与安全教育部重点实验室，北京 100083；2. 中电建路桥集团有限公司，北京 100048； 3. 中铁十六局集团有限公司，北京 100018

收稿日期:2018-01-01 出版日期:2018-12-11 发布日期:2018-12-31
通讯作者: 孙铮，男，1993年生，硕士研究生，主要从事岩土工程灾害防治的研究工作。E-mail: sunzheng1128@126.com E-mail:westboy85@sina.com
作者简介:周喻，男，1985年生，博士，副教授，主要从事矿山岩石力学及数值计算方面的教学与研究工作。
基金资助:
国家青年科学基金资助项目（No.51504016）；中央高校基本科研业务费专项资金资助项目（No.FRF-BD-17-007A）

Meso research on mechanical properties and slab failure mechanism of pre-fractured rock mass under the condition of one side restriction loading

ZHOU Yu¹, SUN Zheng¹, WANG Li², WANG Yu¹, DING Yin-ping³

1. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science and Technology Beijing, Beijing 100083, China; 2. PowerChina Road Bridge Group Co., Ltd., Beijing 100048, China; 3. China Railway 16th Bureau Group Co., Ltd., Beijing 100018, Chin

Received:2018-01-01 Online:2018-12-11 Published:2018-12-31
Supported by:
This work was supported by the National Science Foundation for Young Scholors of China (51504016) and the Fundamental Research Funds for the Central Universities (FRF-BD-17-007A).

摘要/Abstract

摘要：

岩体板裂化破坏是地下工程中一种常见的破坏现象。采用等效岩体技术，将岩体中裂隙（平行于临空面）和岩块分别用光滑节理模型及颗粒体模型表征，通过试验和计算对比，研究单侧限压缩条件下裂隙岩体强度、裂纹分布、裂纹孕育演化规律及裂隙岩体板裂化形成机制。研究表明：（1）随裂隙数量的增加，岩体单侧限抗压强度近似呈线性降低的规律。（2）单侧限压缩下裂隙岩体中产生的裂纹可划分为Ⅰ型～Ⅴ型裂纹，其中Ⅰ型、Ⅱ型（剪切）裂纹是由加载端部效应导致，Ⅲ型～Ⅴ型裂纹由岩体板裂化破坏导致。（3）单侧限压缩下岩体板裂化破坏过程中，导致无侧限边界处岩体剥落的Ⅴ型裂纹最先产生，原生裂隙进一步扩展的Ⅳ型裂纹随后产生，最后产生的是板裂化现象向岩体深部发展的Ⅲ型裂纹。（4）各类裂隙试样在单侧限压缩下的声发射数量与破裂强度均近似服从高斯函数分布关系。

关键词: 裂隙岩体, 板裂化破坏, 单侧限压缩, 等效岩体技术, PFC

Abstract: The slab failure of rock mass is one of the common destruction phenomena in underground engineering. Based upon equivalent rock mass (ERM) technique, the fracture (parallel to the free surface) and rock block are represented by the smooth-joint model and bonded-particle model, respectively. The strength, crack distribution, crack initiation and evolution, and slab failure formation mechanism of fractured rock mass under one side restriction (OSR) compression are studied by comparing experimental results and numerical modelling. With the increase in the number of fracture, the OSR compressive strength of rock mass exhibits linear decreasing. Under OSR loading, five types of cracks generated in rock mass can be identified. The type-Ⅰ and type-Ⅱ (shear) cracks are caused by the loading end effect, while the type-Ⅲ, type-Ⅳ and type-Ⅴ cracks are caused by slab failure of rock mass. In the process of slab failure, type-Ⅴ cracks which causes rock mass spalling at the unconfined boundary first occurs. Then type-Ⅳ cracks result in the propagation of original fractures generate. Finally, the type-Ⅲ cracks generate, which indicates that the slab failure phenomenon is developing towards the interior of rock mass. In various specimens under OSR loading, the relationship between the acoustic emission (AE) quantities and crack magnitude approximates Gaussian function distribution.

Key words: fractured rockmass, slab failure, one side restriction loading, equivalent rock mass technique, PFC

中图分类号:

TU 452

周喻, 孙铮, 王莉, 王宇, 丁银平, . 单侧限压缩下预制裂隙试样力学特性及板裂化机制细观研究[J]. 岩土力学, 2018, 39(12): 4385-4394.

ZHOU Yu, SUN Zheng, WANG Li, WANG Yu, DING Yin-ping, . Meso research on mechanical properties and slab failure mechanism of pre-fractured rock mass under the condition of one side restriction loading[J]. Rock and Soil Mechanics, 2018, 39(12): 4385-4394.

参考文献

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单侧限压缩下预制裂隙试样力学特性及板裂化机制细观研究

Meso research on mechanical properties and slab failure mechanism of pre-fractured rock mass under the condition of one side restriction loading

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单侧限压缩下预制裂隙试样力学特性及板裂化 机制细观研究

Meso research on mechanical properties and slab failure mechanism of pre-fractured rock mass under the condition of one side restriction loading

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单侧限压缩下预制裂隙试样力学特性及板裂化机制细观研究