岩石类材料摩擦局部化损伤本构关系研究  

Research on the friction localization of rocklike materials on damage of constitutive relationship

作　　者：邓绪彪[1,2] 魏思民[1] 宋晓焱[1] 胡青峰[1] 胡海娟[2] 

机构地区：[1]华北水利水电学院资源与环境学院,河南郑州450011 [2]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《中国矿业大学学报》2013年第3期471-476,共6页Journal of China University of Mining & Technology

基　　金：国家重点基础研究发展计划(973)项目(2009CB219603);国家创新研究群体基金项目(50221402);华北水利水电学院自主科研项目(201111-001375)

摘　　要：基于损伤弱化与摩擦强化的思想,利用弹簧、胶结杆、滑片组成细观子链D,并引入剪切带宽度,建立了摩擦局部化损伤本构关系.在本构关系的应力-应变曲线上,随剪切带宽度的增加,硬化模量和峰值强度降低.对比已有的应变梯度理论发现,在细观层次上局部化失稳表现为剪切滑动旋转机制,摩擦滑动效应与已有的应变梯度效应具有物理等效性.各种加载条件下的应力-应变曲线形态表明,局部化带宽度的变化对应了各种通过作用于微观键而影响岩石力学性质因素的变化,如温度、加载速率、颗粒尺寸、气体在岩石内表面的吸附作用等.因此,摩擦局部化损伤本构关系适用于更为复杂的工程地质条件.Based on the principle of damage weakening and friction strengthening,a D-cell of breakage chain which consists of spring,cementation bar and slider block,was formed.Then,with the introduction of the shear band width,the constitutive relationship of the friction localization damage was established in the paper.Stress-strain curve of the constitutive relationship shows that the hardening modulus and the peak strength decrease as the width of shear band increases.Compared with the existing strain-gradient theory,it finds that the localization destabilization at the mesoscopic level represents the shear friction/rotation mechanism.It implicates that the friction slip effect proposed in this paper is equivalent physically with the existing strain gradient effects.Through analysis and comparison of stress-strain curves under different loading conditions,it concludes that the change caused by the shear band width corresponds to the changes which altered the nature of the rock mechanism by acting on micro bonds,such as temperature,loading rate,particle size and the gas absorption on interior surface of the rock.Thus,the damage constitutive relationship of friction localization is suitable for more complex engineering geological environment.

关 键 词：岩石破坏 失稳 局部化 损伤 剪切带宽度 本构关系 

分 类 号：TU452[建筑科学—岩土工程]