冲击地压巷道塑性区本构模型及影响因素研究*

doi:10.16265/j.cnki.issn1003-3033.2019.11.023

摘要/Abstract

摘要： 为研究冲击地压对深部巷道造成的动力灾害问题,以阜新恒大煤矿为背景,分析冲击地压巷道塑性区本构模型及影响因素。考虑损伤的临界冲击应力和临界冲击半径,基于弹塑性理论建立冲击地压巷道塑性区本构模型,通过三轴试验获取模型参数,结合现场实测数据验证模型,分析弹性模量、峰后降模量、黏聚力、内摩擦角及支护应力等5个因素对临界冲击应力、半径的影响。结果表明:临界冲击应力小于巷道上方岩层自重,易发生冲击地压,与实际情况相吻合;临界冲击应力随黏聚力、内摩擦角的增大均存在极小值点;临界冲击半径随黏聚力的增大逐渐减小、随内摩擦角的增大逐渐增大;黏聚力越大发生冲击地压的概率越大;弹性模量、峰后降模量及支护应力与临界冲击应力、半径均呈单调变化关系。

关键词: 冲击地压, 圆形断面, 本构模型, 临界冲击半径, 临界冲击应力

Abstract: In order to study the dynamic disaster caused by the rock burst to the deep tunnel, the constitutive model and the influencing factors of the plastic region of the rock burst were analyzed based on case study of Fuxin Evergrande Coal Mine. Considering the critical impact stress and the critical impact radius of the damage, the plastic region constitutive model of the rock burst roadway was established based on the elastic-plastic theory, and the model parameters were obtained through the three-axis test. The model was verified by field measured data. The influence of five factors on the critical impact stress and radius was analyzed, including elastic modulus, post-peak drop modulus, cohesion, internal friction angle and support stress. The results show that the critical impact stress is less than the self weight of the rock in the upper part of the tunnel, and the rock burst is easy to occur, which is in line with the actual situation, that the critical impact stress has a minimum value point with the increase of cohesion and internal friction angle, that the critical impact stress is gradually reduced with the increase of the cohesion, but increases with the increase of internal friction angle, that the greater the cohesion is, the greater the probability of rock burst will be, and that there is a monotonic relation between the elastic modulus, the peak-to-drop modulus and the supporting stress with the critical impact stress and the radius.

Key words: rock burst, circular roadway, constitutive model, critical impact radius, critical impact stress

中图分类号:

X936

张树光, 陈雷. 冲击地压巷道塑性区本构模型及影响因素研究^*[J]. 中国安全科学学报, 2019, 29(11): 141-148.

ZHANG Shuguang, CHEN Lei. Study on constitutive model and influencing factors of plastic zone of rock burst roadway[J]. China Safety Science Journal, 2019, 29(11): 141-148.

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冲击地压巷道塑性区本构模型及影响因素研究^*

Study on constitutive model and influencing factors of plastic zone of rock burst roadway

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