含瓦斯煤的破坏和流动法则  

The failure mode and flow rule of coal containing gas

作　　者：陈占清[1] 刘树才[1] 赵玉成[1] 

机构地区：[1]中国矿业大学,徐州221008

出　　处：《应用力学学报》2010年第2期269-273,共5页Chinese Journal of Applied Mechanics

基　　金：国家重大基础研究发展计划(2005CB221500);国家自然科学基金(50534090;50974107;50974115;50674087;50834005)

摘　　要：讨论了含瓦斯煤破坏形式及相应的破坏条件,以应变分量表示应力分量建立了关联于Drucker-Prager准则和Lagrange准则的正则流动法则,考虑了剪切屈服和拉伸破坏两种状态之间的转换。剪切屈服后的流动是双向的,而拉伸破坏后流动是单向的;对于剪切屈服和拉伸破坏后的流动,应变变化路径不同,应变增量与应力增量之间的关系也不同;应力增量与应变增量的关系,不能由几个方程简捷地表示,需要用流程才能表达。Two failure modes,the submittal owing to shearing and the failure owing to tension,of coal containing gas(CCG) and the failure criteria corresponding to the two modes are discussed.On this basis,regular flow rules of CCG associated with Drucker-Prager criterion and Lagrange criterion are established,in which stress components are expressed by strain components.The rule that CCG fails from a mode to the other is discussed.The flow of CCG post shearing submittal is bilateral flow,and the flow post tension failure is unilateral,so it is impossible to formulate the rule of both failure and flow of CCG in an identical plastic potential function.Strain components are active,and stress components are passive,the latter can only be calculated by the former based on the flow rule.So,the flow rule of CCG should adopt the form in which stress components are expressed by strain components;the relation between stress components and strain components should be decided by the path of strain change.The relation should be expressed by flow chart and can not be expressed by a set of equations.

关 键 词：等效孔隙压力系数 含瓦斯煤 剪切屈服 拉伸破坏 有效应力 

分 类 号：O351[理学—流体力学]