不同填充裂纹位置与尺寸下的类岩石试样破坏研究  

Study on the Failure of Quasi Rock Samples Under Different Filling Crack Positions and Sizes

作　　者：经来旺[1] 蒋浩杰 郑霖 Jing Laiwang;Jiang Haojie;Zheng Lin(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Anhui Huainan 232001)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《山东煤炭科技》2024年第4期123-127,共5页Shandong Coal Science and Technology

基　　金：国家自然科学基金项目资助(51904012);安徽省高等学校自然科学研究重点项目资助(KJ2019A0099)。

摘　　要：为了研究不同填充裂纹位置和尺寸对类岩石试样力学性能和破坏特征的影响,制备裂纹宽度分别为20 mm、40 mm和60 mm,开度分别为2 mm、4 mm和6 mm且分别分布于试样中部和边部的类岩石试样,分析试样的单轴压缩强度和裂纹扩展状态。结果表明:随着裂纹宽度和开度的增加,试样的有效承载能力逐渐降低,单轴压缩强度逐渐下降;中部裂纹两端萌生的翼型裂纹是试样失效的主要裂纹,边部填充裂纹能够有效抑制翼型裂纹的萌生,使得边部填充裂纹试样单轴压缩强度高于中部填充裂纹试样。该研究可以为巷道支护结构的安全性能评估和使用寿命预测提供试验依据。In order to study the effects of different filling crack positions and sizes on the mechanical properties and failure characteristics of quasi rock samples,quasi rock samples with crack widths of 20 mm,40 mm,and 60 mm,and opening degree of 2 mm,4 mm,and 6 mm are prepared and distributed in the middle and edge of the samples,respectively.The uniaxial compressive strength and crack propagation state of the samples are analyzed.The results show that as the crack widths and opening degree increase,the effective bearing capacity of the samples gradually decreases,and the uniaxial compressive strength gradually decreases;the wing shaped cracks that initiate at both ends of the middle cracks are the main cracks that cause samples failure.The edge filled cracks can effectively suppress the initiation of wing shaped cracks,making the uniaxial compressive strength of the edge filled crack samples higher than that of the middle filled crack samples.This study can provide experimental basis for the safety performance evaluation and service life prediction of roadway support structures.

关 键 词：填充裂纹 裂纹类型 峰值强度 破坏特征 裂纹扩展 

分 类 号：TD315[矿业工程—矿井建设]