1. State Key Laboratory oh Coal Resources and Safe Mining,China University of Mining and Technology(Beijing),Beijing　 100083,China;2. School of Re- source and Safety Engineering,China University of Mining and Technology( Beijing),Beijing　 100083,China; 3. State Coal Mining National Engineering Technology Research Institute,Huainan　 232000,China;4. State Key laboratory of Deep Coal Mining and Environment Protection,Huainan　 232000,China

煤巷开挖时瞬间围岩即出现异常的、较大的弹性变形行为,难以用胡克定律解释。这表明即便是弹性变形阶段,煤体也表现出强烈的非线性行为。这是由于煤体与其他岩石相比,分布着大量的孔隙、裂隙、层理、割理等诸多类型的缺陷,具有更加明显的非均质性。首先分析了煤体的非线性弹性特征,而后给出了其非线性弹性力学行为的本构方程,并进行了数值编程,实现了可以考虑煤体非线性弹性阶段的弹塑性NLEPS本构模型,最后进行了有效的数值验证,并在大尺度的煤巷开挖中进行了应用可行性分析。计算结果表明基于NLEPS本构模型的计算结果更为准确地反映了煤层巷道开挖卸载诱发的围岩非线性变形行为。

During the excavation of coal roadway,the surrounding rock often shows abnormal and large elastic deforma- tion. This behavior is difficult to explain with Hooke’s law. This indicates that even in the elastic deformation stage, the coal also show a strong nonlinear behavior. Compared with other rocks,since the distribution of various defects, such as pore,fracture,bedding and cleats,coal has more obvious heterogeneity. Firstly,the nonlinear elastic character- istics of coal are analyzed in this paper. Then it gives the constitutive equation of the nonlinear elastic mechanical be- havior and the numerical programming. NLEPS constitutive model is proposed considering the nonlinear elastic me- chanical behavior of coal. Finally,the effective numerical verification is carried out,and the application feasibility anal- ysis is carried out in coal roadway excavation. The calculation results indicate that the nonlinear deformation behavior of surrounding rock which is induced by coal roadway excavation is more accurately reflected by the calculation results based on NLEPS constitutive model. The nonlinear elastic constitutive model parameter has a clear physical meaning and can be widely used in coal mining engineering.

国家自然科学基金资助项目(41272347)；国家科技支撑计划资助项目(2013BAB02B01)；煤炭资源与安全开采国家重点实验室开放基金资助项目(SKLCRSM16DCB01)；

Hao Xianjie,Yuan Liang,Lu Zhiguo,et al. An elastic-plastic-soften constitutive model of coal considering its nonlinear elastic mechanical behavior[J]. Journal of China Coal Society,2017,42(4):896-901.