静动载耦合作用下裂隙岩石损伤本构及演化特征

doi:10.13722/j.cnki.jrme.2014.1203

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摘要裂隙岩石在经过地震作用后，包括初始弹性模量在内的强度参数将发生改变，力学特性受到影响。基于MTS岩石力学试验平台，预制不同裂隙倾角、间距和连通率的试样，在进行单轴压缩试验之前，预先施加一定频率和幅值的动荷载，以模拟地震波的影响。基于宏观统计损伤模型，考虑动荷载作用造成的初始损伤与静荷载损伤的耦合作用，并根据最小耗能原理确定的损伤门槛值，建立修正的裂隙岩石试样损伤演化本构方程，并与试验结果对比，表明该方程能很好的描述试样峰前应力–应变关系。通过对损伤变量演化与裂隙岩石试样结构面特征关系的分析，表明裂隙的特征参数不影响试样的宏观本构关系。随着裂隙倾角增加，初始损伤量和临界损伤量均增加，损伤累积过程更显著；随着连通率增加，初始损伤量和临界损伤量均增加；随着裂隙间距增加，裂纹搭接、贯通程度增加，初始损伤量基本不变，临界损伤量减小。

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关键词 ：岩石力学, 裂隙岩石, 单轴压缩, 静动力, 耦合作用, 损伤演化模型

Abstract：After earthquake，intensive parameters of fractured rock including initial elastic modulus were changed，and its mechanical properties were affected in this process. Based on the Rock Mechanics Testing System(MTS)，samples were made with different pre-existing fissures in aspect of fracture angel，spacing and connectivity. In order to simulate the influence of earthquake wave，dynamic load was applied with a certain frequency and amplitude before the uniaxial compression tests. Based on macroscopic statistical damage model，in consideration of the coupling action of initial damage caused by dynamic load and damage caused by static load，getting the damage threshold by least energy consumption principle，the modified damage evolution constitutive equation of fractured rock sample was established，which can correctly describe the stress-strain relationship before peak strength. Through the analysis of relationship between damage variable evolution and characteristic of structure plane，it was indicated that fracture characteristic parameters do not affect the macroscopic constitutive relationship. With the increase of fracture angle，the initial and critical damage variables both increase with an outstanding damage accumulation process. With the increase of connectivity，the initial and critical damage variables both increase. With the increase of fracture spacing，fracture coalescence and failure level become higher，and the initial damage variables are essentially unchanged，while the critical damage variables decrease.

Key words： rock mechanics fractured rock uniaxial compression static and dynamic load coupling action damage evolution model

引用本文:

李心睿1，2，徐清1，2，谢红强1，2，肖明砾1，2，何江达1，2. 静动载耦合作用下裂隙岩石损伤本构及演化特征[J]. 岩石力学与工程学报, 2015, 34(s1): 3029-3036.
LI Xinrui1，2，XU Qing1，2，XIE Hongqiang1，2，XIAO Mingli1，2，HE Jiangda1，. DAMAGE CONSTITUTIVE LAW AND DAMAGE EVOLUTION CHARACTERISTICS FOR FRACTURED ROCK UNDER COUPLING ACTION OF STATIC AND DYNAMIC LOAD. , 2015, 34(s1): 3029-3036.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.1203 或 http://www.rockmech.org/CN/Y2015/V34/Is1/3029

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