坡积土石混合体蠕变特性的Burgers模型  

Burgers model of creep properties of colluvial soil-rock mixture

作　　者：郭鸿[1,2,3] 郭瑞 南亚林[2,3] 张鹏[2] 刘魁 GUO Hong;GUO Rui;NAN Yalin;ZHANG Peng;LIU Kui(School of Civil Engineering and Architecture,Shaanxi University of Technology,Hanzhong 723000,China;China Electronic Research Institute of Engineering Investigations and Design,Xi’an 710054;Soil Engineering Technology Research Center of Shaanxi,Xi’an 710054,China;College of Geological Engineering and Geomatics,Chang’an University,Xi’an 710054,China)

机构地区：[1]陕西理工大学土木工程与建筑学院,陕西汉中723000 [2]信息产业部电子综合勘察研究院,陕西西安710054 [3]陕西省土体工程技术研究中心,陕西西安710054 [4]长安大学地质工程与测绘学院,陕西西安710054

出　　处：《中山大学学报（自然科学版）》2020年第6期64-69,共6页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：陕西省重点研发计划项目(2020SF-430,2019ZDLSF05-07);陕西省教育厅专项科研计划项目(19JK0174);陕西理工大学人才启动项目(SLGQD2017-03)。

摘　　要：为探明坡积土石混合体的蠕变特性,利用大型直剪仪对陕西省城固县某边坡的坡积土石混合体进行了剪切蠕变试验,重点研究了分级加载方式下坡积土石混合体的蠕变特性,建立了坡积土石混合体的Burgers模型并确定了其参数获取方式,并建议了在分级加载条件下获取分别加载蠕变终值的方法。结果表明:分级加载方式下土石混合体的蠕变规律呈衰减蠕变特性,且蠕变变形随着垂直应力的减小和剪切应力的增大而增大,不同垂直应力下的t/[ε(t)-ε(t0)]-t的曲线均呈高度线性,且拟合的直线方程斜率和剪切应力没有明显的相关性。本文提出的Burgers模型能够较好地模拟该地区坡积土石混合体的剪切蠕变特性。In order to investigate the creep characteristics of colluvial soil-rock mixture,shear creep tests were performed by using a large-scale direct-shear instrument on a colluvial soil-rock-soil mixture of a slope in Chenggu county,Shaanxi province.The creep characteristics of the colluvial soil-soil-mixture under graded loading were mainly studied to establish the Burgers creep model and determine the parameters through the data fitting.The method of obtaining the final creep value of separate loading under the condition of graded loading is suggested.The results showed that the creep law of soil-rock mixture exhibits a gradual creep behavior under the grading loading,and the creep deformation increases with decreasing vertical and increasing shear stresses.The curves of t/[ε(t)-ε(t0)]-t under different vertical stresses are all highly linear,and there is no obvious correlation between the slope of the fitted straight line and the shear stress.The Burgers model proposed in this paper can well simulate the shear creep characteristics of the colluvial soil-rock mixture in the research area.

关 键 词：坡积土石混合体 剪切蠕变 BURGERS模型 

分 类 号：TU432[建筑科学—岩土工程]