开度相关模型在岩石热开裂问题中的应用

doi:10.13722/j.cnki.jrme.2019.0645

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摘要岩石内部原生裂隙会阻碍热流的传导同时重新分布温度场，进而影响岩石内部热应力分布状态并导致岩石的开裂，因此对复杂多裂隙岩石在高温状态下热传导及热开裂机制的探究具有重要的意义。利用颗粒流程序对岩石内部的动态传热–破裂过程进行了模拟。首先，考虑到岩石内部矿物组分的不同，故选用团簇模型对岩石内部的细观结构及组分分布进行表征，并以此作为基准模型进行细观力学参数的标定。其次，为了更真实地模拟岩石内部裂隙对热传导及热开裂过程所造成的影响，假设裂隙的热力学特性同开度相关，并利用不同裂隙开度条件下宏观参量的解析解对裂隙的热参数及细观力学参数进行标定，进而提出裂隙热参数及细观力学参数开度相关模型。最后结合随机裂隙网络，探究了在不同形状参数m的作用下裂隙开度分布对岩石热传导及热开裂过程的影响。研究结果表明：随着形状参数m的增大，热传导达到稳态所需的时间逐渐减小，热致裂纹萌生速率增大，由此也验证了开度相关模型在模拟复杂多裂隙岩石热传导及热开裂问题中的可行性。

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	李孟熠1
	2
	吴志军1
	2
	周原1
	2
	刘泉声1
	2
	沈坚强3

关键词 ：岩石力学, 离散元, 复杂多裂隙岩石, 热开裂, 开度相关模型

Abstract：The primary fractures of the rock would hinder heat flux flowing and redistribute temperature field，which in turn affect the thermal stress distribution inside the rock and lead to the cracking of the rock. Therefore，it is of great significance to investigate the mechanism of heat conduction and thermal cracking of multi-fractured rocks under high temperature. In this study，the particle flow code was adopted to simulate the dynamic process of heat transfer-crack inside the rock. Firstly，considering the difference in mineral composition inside the rock，the cluster model was adopted to characterize the meso-structure and composition distribution of the rock，and then the mesoscopic parameters were calibrated. Secondly，to more realistically simulate the influence of internal fractures on heat flux flowing and thermal cracking，the thermodynamic properties of cracks were assumed to be the aperture dependent，and the thermal and meso-mechanical parameters of the fracture were calibrated through the analytical solutions of macroscopic parameters under different fracture aperture conditions. Correspondingly，the aperture dependent models for thermal parameter and meso-mechanical parameter were proposed，respectively. Finally，combined with the random fracture network，the influence of the fracture aperture distribution on the thermal conduction and thermal cracking in multi-fractured rocks were investigated，in which the fracture aperture distribution was controlled by different shape parameters m .The results showed that with the increase of shape parameter m，the time cost for the thermal conduction reaching the steady-state was gradually reduced while the rate of thermal crack initiation increased. The feasibility of the proposed aperture-dependent model in simulating the thermal conduction and thermal cracking in multi-fractured rocks were also verified.

Key words： rock mechanics discrete element multi-fractured rock thermal cracking aperture dependent model

引用本文:

李孟熠1，2，吴志军1，2，周原1，2，刘泉声1，2，沈坚强3. 开度相关模型在岩石热开裂问题中的应用[J]. 岩石力学与工程学报, 2019, 38(S2): 3520-3531.
LI Mengyi1，2，WU Zhijun1，2，ZHOU Yuan1，2，LIU Quansheng1，2，SHEN Jianqiang3. Application of aperture dependent model in thermal cracking of rock. , 2019, 38(S2): 3520-3531.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0645 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS2/3520

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