基于模拟的岩石类材料在动载作用下的裂缝扩展研究
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摘要
随着高层建筑和地下工程的发展,岩石类材料的动力特性在理论和工程中越来越受到重视。岩石作为一种非均匀性显著的准脆性材料,在动态荷载达到强度极限时,能量的瞬间释放会引发应力的重分布,诱使局部力学性质迅速劣化,引发裂缝高速扩展,并以弯曲和分叉为基本表现形式。因此,研究岩石类材料在动荷载作用下的裂缝扩展,直是研究者关注的重要问题。
     本文基于统计分布和损伤力学的RFPA(Realistic Failure Process Analysis)方法,从细观力学角度对岩石类材料的裂缝动态扩展问题展开详细研究,具体研究可以分为以下几个方面:
     1.基于Weibull随机分布函数可以描述岩石类材料的细观非均匀性的普遍规律,在考虑细观单元非均匀性的基础上,建立了岩石在动力作用下的弹脆性损伤演化本构模型。通过引入粘弹性边界方法,研究了非均匀无限域的波动问题。
     2.基于动接触二步法和细观线性行为可以反映宏观非线性行为的原理,详细研究了非均匀材料的碰撞问题。由于考虑了撞块和被撞击物的相互作用,可以通过接触方法反映因材料损伤引起的加载变化,模型与实际更贴近。通过选取有代表性的三个侧向撞击模型,并与试验现象进行了验证对比,验证了该方法可行性的同时,更系统分析了不同程度的非均匀性对裂缝扩展的影响,丰富和扩展了前人的研究成果。
     3.分析了冲击作用下不同均质度的岩石以及砂砾岩的响应规律。结果表明:应力波传播过程中产生的拉应力是裂缝萌生和扩展的关键。与静态岩石破碎过程相比,冲击作用下岩石的应力改变具有时间效应,应力波传播过程中表现出压、拉变化。
     4.利用数值模拟方法,从细观力学角度揭示宏观裂缝扩展的非对称性和非连续性的形成机理。数值模拟结果较好的再现了试验现象和规律,说明考虑细观上的非均匀性可以实现宏观破坏过程中的非线性,细观上的简单本构关系可以模拟复杂的宏观破裂现象。
With the development of high-rise buildings and underground projects, more attentions have been paid to the dynamic properties of bedrock structures in both theoretical studies and engineering applications. As a heterogeneous material, when the stress is higher than the strength of rock, instantaneous energy release results in stress redistribution, which triggers dramatic deterioration of rock mechanical properties and rapid propagation of cracks. Under the combined effect of heterogeneity and internal stresses in the rock material, crack propaga-tion is essentially featured by crack curving and branching. Therefore, crack growth in rock-like materials subjected to dynamic loading, especially crack curving and branching, is one of the theoretical and engineering problems attracting attentions of many researchers.
     In this study, the dynamic version of RFPA2D(Realistic Failure Process Analysis) pro-gram was employed to simulate crack propagation. The research content was as follows:
     1. Since the Weibull distribution of the properties of mesoscopic structures and the linear mesoscopic mechanical behaviors can reflect the macroscopic nonlinear behaviors, a constitutive model for damage evolution was developed to simulate the completely fail-ure process of rock subjected to dynamic stress. By importing the Viscous-spring artifi-cial boundary into the model, the wave propagation in heterogeneous infinite media was investigated.
     2. Based on dynamic method and the linear mesoscopic mechanical behaviors can reflect the macroscopic nonlinear behaviors, the collision process between two heterogeneous spe-cimens was researched in details. Because the interaction between the impactor and spe-cimen was considered, the model was closer to the reality. Three typical impact models were investigated in the paper. Comparing with the former experimental results, the availability of the method was verified. Furthermore, the different degree of heterogenity was also discussed in details. The reasearch can enrich and extend the former investiga-tion.
     3. Based on damage theory and FEM method, rock fragmentation mechanism induced by a drill bit subjected to dynamic loading was investigated. Compared with rock fragment by static stress, there is a stress transition from compression to tension in the specimens un-der dynamic loading, e.g. the compression stress will be changed to tension during wave propagation. The results show that the process of wave propagation is changed and the emergency of tension is the key of crack initiation and growth.
     4. By numerical method, the asymmetric and discontinuous behavior of crack propagation was analyzed at mesoscopic scale based on the damage evolution principle. The results coincide with the experimental laws, so it is certain that the linear mesoscopic mechanical behaviors can reflect the macroscopic nonlinear behaviors, and the complex mechanism of crack propagaion at macroscopic scale can be analyzed by this way.
引文
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