不同干密度红砂岩土分离式霍普金森压杆试验与分析  

Split Hopkinson pressure bar tests and analysis on different dry densities of red sandstone soil

作　　者：程昀 于东升 张金团 韩晶晶 蔡军 王彤[2] CHENG Yun YU Dongsheng ZHANG Jintuan HAN Jingjing CAI Jun WANG Tong(School of Civil Engineering, Hezhou University, Hezhou 542899, China School of Architectural and Surveying Engineering,Jiangxi University of Science and Teehnology,Ganzhou 341000, China)

机构地区：[1]贺州学院建筑工程学院,广西贺州542899 [2]江西理工大学建筑与测绘工程学院,江西赣州341000

出　　处：《四川建筑科学研究》2017年第5期72-77,共6页Sichuan Building Science

基　　金：2017年度校级科研项目自然科学类(2017ZZZK04);国家自然科学基金(50869002);2016年度校级科研项目自然科学类(2016ZZZK06)

摘　　要：红砂岩土作为路基回填土时,会导致路基出现厚度大、疏松等问题。为解决动荷载条件下红砂岩土的能量耗散问题,选取了赣州南桥-龙川高速公路路基土为试验材料,利用SHPB试验装置对不同干密度的红砂岩土进行了冲击试验。基于试验,主要分析了冲击应力波波形、峰值应力的变化特征,以及吸收能与冲击次数、反射能与平均应变率、总吸收能与干密度的关系。通过拟合建立了数学经验模型,并明确了不同干密度红砂岩土的能量耗散规律,可为赣南地区红砂岩土加固提供参考。In order to solve the problem of large thickness and porosity of red sandstone Soil Subgrade, the impact tests were conducted by split Hopkinson pressure bar, the test material selected Ganzhou South Bridge-Longehuan Expressway Subgrade Soil. Based on the combined static and dynamic loading test, this paper analyzed the characteristics of the shock stress wave and the peak stress, and studied the relationship between the absorption energy and the impact times, the reflection energy and the average strain rate, the total absorption energy and the dry density. By means of fitting, the mathematical model was established, and the energy dissipation law of red sandstone soil with different dry density was defined. The results can provide reference for the consolidation of soil in the south of Jiangxi province,

关 键 词：分离式霍普金森压杆 峰值应力 平均应变率 吸收能 反射能 

分 类 号：TU411[建筑科学—岩土工程]