干燥与饱水状态下炭质板岩蠕变特性研究  

Study on Creep Characteristics of Carbonaceous Slates under Dry and Saturated States

作　　者：宋勇军[1] 雷胜友[2] 邹翀[3] 张文新[3] 

机构地区：[1]西安科技大学建筑与土木工程学院,西安710054 [2]长安大学公路学院,西安710064 [3]中铁隧道集团有限公司技术中心,河南洛阳471009

出　　处：《地下空间与工程学报》2015年第3期619-625,664,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金资助项目(11402195);陕西省教育厅科学研究计划资助项目(14JK1480);西安科技大学博士科研启动金(2014QDJ080)

摘　　要：采用分级增量循环加卸载方式,对兰渝铁路木寨岭二期隧道炭质板岩进行干燥与饱水状态下的蠕变试验。结果表明:无论干燥状态还是饱水状态,在各种应力水平作用下,岩石试件均产生了可恢复的瞬时弹性应变、不可恢复的瞬时塑性应变、可恢复的粘弹性应变以及不可恢复的粘塑性应变;水对岩石瞬时变形的影响主要表现在瞬时塑性应变方面,对瞬时弹性变形的影响不大;在蠕变变形方面,水对岩石黏弹性影响显著,对粘塑性应变的影响较小。根据岩石蠕变特点,选用Burgers模型描述炭质板岩流变特性,蠕变试验曲线与理论曲线吻合较好。Using the incremental step and circular loading and unloading method,a set of creep experiments were performed to study the visco-elasto-plastic properties of carbonaceous slates in Muzhailing Tunnel of LanzhouChongqing railway under dry and saturated condition. The results show that the specimen had the recoverable instantaneous elastic strain,unrecoverable instantaneous plastic strain,recoverable visco-elastic strain and unrecoverable visco-plastic strain under different stress action,regardless of dry or water saturated states. The influence of water on rock＇s instantaneous deformation is mainly in the instantaneous elastic strain and a little in instantaneous elastic strain; in respect of creep deformation,water has significant influence on viscoelastic properties of rock and little influence on visco-plastic strain. Based on the experimental results and characteristics of rock specimen,a Burger model was chosen to simulate rheological properties of carbonaceous slates and the creep testing curves of the rock specimen are coincident well with the theoretic curves.

关 键 词：分级加卸载 干燥和饱水状态 粘弹塑性 Burgers流变模型 

分 类 号：TU452[建筑科学—岩土工程]