Energy evolution of sandstone under true triaxial cyclic principal stress

ZHAO Guang-ming; LIU Zhi-xi; MENG Xiang-rui; ZHANG Ruo-fei; GU Qing-heng; QI Min-jie

doi:10.16285/j.rsm.2022.1757

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Energy evolution of sandstone under true triaxial cyclic principal stress

更新时间：2026-06-25

- Energy evolution of sandstone under true triaxial cyclic principal stress
- Vol. 44, Issue 7, Pages: 1875-1890(2023)
- 作者机构：
  
  1. 安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽,淮南,232001
  2. 安徽理工大学煤矿安全高效开采省部共建教育部重点实验室,安徽,淮南,232001
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2022.1757
  CLC： TU451
- Online First：16 July 2023，
  
  Published：2023
- 稿件说明：
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ZHAO Guang-ming, LIU Zhi-xi, MENG Xiang-rui, et al. Energy evolution of sandstone under true triaxial cyclic principal stress[J]. 2023, 44(7): 1875-1890.
DOI：

ZHAO Guang-ming, LIU Zhi-xi, MENG Xiang-rui, et al. Energy evolution of sandstone under true triaxial cyclic principal stress[J]. 2023, 44(7): 1875-1890. DOI： 10.16285/j.rsm.2022.1757.

摘要

为了探究真三轴主应力循环加卸载对砂岩能量积聚与耗散的影响，利用自主研发的真三轴扰动卸荷岩石测试系统进行了3个主应力循环加卸载试验。基于真三轴循环加卸载应力−应变演化规律与加卸载特征，划分了主应力循环加卸载试验中加载、卸载的种类；通过对三向主应力循环加卸载过后岩体表面裂纹对比分析，发现最小主应循环对岩体产生损伤最大，中间主应力次之，最大主应产生损伤最小；利用图形面积积分法与叠加法分别计算了真三轴循环加卸载的弹性能密度、耗散能密度与输入能密度，分析了三者随主应力次数增加的演化规律与加卸载过程中的能量分配；利用真三轴同时加卸载试验，验证了上述提出的能量分析方法的合理性与准确性，对其3个主应力方向卸载释放弹性能密度分析，发现循环加卸载产生的损伤对岩体储存弹性能密度影响较小。对比了3个主应力卸载对砂岩损伤与能量耗散的影响，对巷道掘进方向进行了进一步讨论。

Abstract

To explore the influence of true triaxial cyclic loading and unloading in principal stress directions on sandstone energy accumulation and dissipation

three cyclic loading and unloading tests in principal stress directions were carried out by using the self-developed true triaxial disturbed unloading rock testing system. Based on the stress-strain evolution law and the loading and unloading characteristics of true triaxial cyclic loading and unloading tests

the types of loading and unloading in the cyclic loading and unloading tests are classified. Through the comparative analysis of the surface cracks of rock mass after cyclic loading and unloading in three principal stress directions

it is found that the minimum principal stress cycle causes the severest damage to rock mass

followed by the intermediate principal stress

and the maximum principal stress causes the least damage. The elastic energy density

dissipated energy density

and input energy density of true triaxial cyclic loading and unloading are calculated by using the graph area integral method and the superposition method

respectively. The evolution laws of the above three densities with the increase of the number of principal stresses and the energy distribution during loading and unloading are analyzed. The rationality and accuracy of the proposed energy analysis method are verified by the true triaxial loading and unloading test

and the elastic energy released by unloading in three principal stress directions is analyzed. The damage caused by cyclic loading and unloading has little influence on the elastic energy stored in the rock mass. The influences of unloading independently in three principal stress directions on sandstone damage and energy dissipation are compared

and the advancing direction of the roadway is further discussed.

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