增幅疲劳荷载作用下含双裂隙花岗岩空心圆柱破裂演化试验研究

doi:10.13722/j.cnki.jrme.2021.0805

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摘要为了揭示裂隙型空心圆柱体在中低应变率应力扰动作用下的破裂演化特征及细观力学机制，探究地下工程中常见的孔洞–裂隙组合型岩体的破裂和失稳物理过程，设计4种不同预制裂隙角度的空心圆柱体试样，采用GCTS-RTR 2000岩石力学试验系统，实时声发射监测和试验后CT扫描相结合的手段，研究预制裂隙方位对岩石在多阶段增幅疲劳荷载作用下的结构劣化特征及岩桥断裂模式。试验结果表明：(1) 随着裂隙角度的增大，岩石的疲劳强度、体积变形以及疲劳寿命逐渐增大，且体积变形增长速率越来越快，基于不可逆轴向应变，提出一种描述岩石疲劳损伤的两阶段损伤演化模型。(2) 岩石破裂过程中声发射振铃数及能量变化受裂隙角度影响，累计振铃计数与累计能量计数随着裂隙角度的增大而增加，岩石在应力幅值突然增加时刻的累积损伤要大于疲劳加载阶段。(3) 试样疲劳力学试验后的工业CT扫描揭示了岩桥段破裂形成的不同缝网模式，且受裂隙角度影响较大，裂隙网络的复杂程度随着裂隙角度的增加而增大，表明裂隙角度越大，岩石越不容易发生疲劳破坏。试验结果有利于深入理解裂隙型孔洞岩体的疲劳破坏机制，可为应力扰动作用下裂隙岩体巷道开挖设计、围岩稳定性控制及岩体长期稳定性提供必要的理论支撑。

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	王宇1
	2
	杨浩男1
	2
	易雪枫1
	2
	厉飓洲1
	2
	李长洪1
	2

关键词 ：岩石力学, 空心圆柱体花岗岩, 破裂演化, 疲劳破坏, 声发射, CT扫描

Abstract：This work aims to reveal the fracture evolution characteristics and the meso-mechanical mechanism of the pre-flawed hollow cylinder granite subjected to stress disturbance with a kind of medium-low strain rate，and to further investigate the fracture and instability process of the cavity-fissure composite rock mass commonly encountered in underground engineering. Typical four hollow cylinder specimens with different prefabricated flaw angles were tested using the CTS-RTR 2000 rock mechanics testing system，the real-time acoustic emission(AE) monitoring and the post-test computed tomography(CT) scanning technique. The experimental results show that：(1) The rock fatigue strength，the volume deformation and the fatigue life gradually increase with the flaw angle，and the growth rate of the volume deformation becomes faster. Using the irreversible axial strain，a two-stage damage evolution model was proposed to describe the fatigue damage of rock. (2) The AE count and energy in the process of rock fracture are affected by the angle of two fissures. The cumulative count and accumulated energy count increase with increasing the fissure angle. The cumulative damage of rock at the moment of the sudden increase of stress amplitude is greater than that at the fatigue loading stage. (3) Post-test CT scanning reveals different fracture modes formed from the rock bridge segment，which is greatly affected by the fissure angle. The complexity of the fracture network increases with the increase of the fissure angle，indicating that the rock is different to be fractured with a larger fissure angle. The experimental results are helpful in understanding the fatigue failure mechanism of pre-flawed hollow rock，and provide necessary theoretical supports for the tunnel excavation design，the stability control of surrounding rocks and the long-term stability of jointed rock mass exposed to stress disturbance.

Key words： rock mechanics hollow-cylinder granite fracture evolution fatigue failure acoustic emission CT scanning

引用本文:

王宇1，2，杨浩男1，2，易雪枫1，2，厉飓洲1，2，李长洪1，2. 增幅疲劳荷载作用下含双裂隙花岗岩空心圆柱破裂演化试验研究[J]. 岩石力学与工程学报, 2022, 41(7): 1325-1337.
WANG Yu1，2，YANG Haonan1，2，YI Xuefeng1，2，LI Juzhou1，2，LI Changhong1，2. Investigation on fracture evolution of pre-flawed hollow-cylinder granite under increasing-amplitude cyclic loads . , 2022, 41(7): 1325-1337.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0805 或 https://rockmech.whrsm.ac.cn/CN/Y2022/V41/I7/1325

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