不同建模假定下岩石损伤黏弹模型的参数转换关系探讨  

Transformational relations between parameters of rock damage viscoelastic model using different modeling approaches

作　　者：方焘[1,2] 刘新荣[1,3] 黄明[4] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]华东交通大学土木建筑学院,南昌330013 [3]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045 [4]福州大学土木工程学院,福州350108

出　　处：《岩土力学》2012年第7期2000-2006,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.50908086);新世纪优秀人才支持计划(No.NCET-05-0763);江西省教育厅科技计划项目(No.GJJ09220)

摘　　要：将外界因素对岩石变形的影响考虑为瞬间弹性损伤和长期蠕变损伤,并根据加载瞬间弹性模量及蠕变模量的劣化分别对瞬间弹性损伤变量和蠕变损伤变量进行定义,由此建立了考虑损伤的kBurgers模型。在此基础上,通过假定泊松比和体积模量为常量分别得到了对应的模型三维表达式,并得到了不同建模思路下模型参数间的换算关系。最后结合实际算例,对常体积模量假定下模型参数随含水率变化的损伤演化规律进行了分析,获得了常体积模量假定下模型的瞬间弹性损伤和长期蠕变损伤演化方程,检验了模型参数换算关系的有效性。Considering the external influences on rock deformation as instantaneous elastic damage defined with the reduction of instantaneous elastic modulus and long-term creep damage defined with the reduction of long-term creep modulus,kBurgers model with damage is presented.In addition,three-dimensional model considering the Poisson’s ratio and bulk modulus as the constant is established separately;and the transformational relations between the parameters are obtained.According to a case study,the damage evolution of model parameters considering water content changing under the assumption of constant bulk modulus is studied.The damage evolution equations of instantaneous elasticity and long-term creep under the assumption of constant bulk modulus are obtained,which prove that transformational relations between model parameters are reasonable.

关 键 词：黏弹性 常体积模量 常泊松比 损伤 

分 类 号：O344.6[理学—固体力学]