Compression Characteristic and Creep Behavior of Moraine Soil at Xingkang Bridge,West Sichuan,China  

作　　者：Xifeng Guo Xinfu Xing Zhonghao Wang Qiang Cheng Lei Huang Ning Li Shengming Hu 

机构地区：[1]Chongqing Branch Institute,Changjiang River Scientific Research Institute,Chongqing 400026,China [2]Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China [3]School of Civil and Environmental Engineering,Harbin Institute of Technology,Shenzhen 518055,China [4]Sichuan Highway Planning,Survey,Design and Research Institute Ltd.,Chengdu 610041,China [5]Engineering Research Center of Rock-Soil Drilling&Excavation and Protection,Ministry of Education,China University of Geosciences,Wuhan 430074,China [6]Badong National Observation and Research Station of Geohazards,China University of Geosciences,Wuhan 430074,China [7]Construction Branch,State Grid Ningxia Electric Power Co.Ltd.,Yinchuan 750002,China [8]National and Provincial Joint Engineering Laboratory for the Hydraulic Engineering Safety and Efficient Utilization of Water Resources of Poyang Lake Basin,Nanchang Institute of Technology,Nanchang 330099,China

出　　处：《Journal of Earth Science》2023年第4期1272-1279,共8页地球科学学刊（英文版）

基　　金：supported by the Engineering Research Center of Rock-Soil Drilling&Excavation and Protection,Ministry of Education (No.202202);the National Natural Science Foundation of China (Nos.42107180,42162023 and 42162025);the Construction S&T Project of Department of Transportation of Sichuan Province of China (No.2020A01)。

摘　　要：The compression and creep characteristics of moraine soil are important mechanical properties of geomaterials to be analyzed during the construction process of engineering projects.However,related references about these characteristics through large-size in-situ tests have rarely been reported.In this study,in-situ tests of particle size distribution,compression deformation,and compression creep were conducted at the Xingkang Bridge,West Sichuan,China.The results show that the uniformity coefficient of moraine soil ranges from 12.1 to 183.3,and gradation coefficient ranges from 0.4 to 2.8.The total compression deformations of moraine samples during the conventional compression deformation test are 4.70,4.07,and 0.47 mm,and their residual deformations are 2.81,2.45,and 0.22 mm,respectively.The deformation modulus ranges from 127.3 to 676.4 MPa,and elastic modulus ranges from 316.3 to 765.7 MPa.During compression creep tests,moraine soil enters the steady creep stage after 3.8 h of loading pressure at 445 k Pa,and it keeps steady after 14 h of loading pressure at 900 k Pa.The Burgers model and generalized Kelvin model predict the deformation well in transient,deceleration and steady creep stages.Results provide a valuable reference for the analysis of the compression deformation and creep behavior of moraine soil during engineering construction and management.

关 键 词：MORAINE compression CREEP IN-SITU mechanical properties. 

分 类 号：U442.2[建筑科学—桥梁与隧道工程]