岩土力学2017，Vol.38Issue(10)：2957-2961,2972,6.DOI:10.16285/j.rsm.2017.10.024
主动围压状态人工冻结砂土SHPB试验与分析
SHPB tests on artificial frozen sand and its analysis under active confining pressure
摘要
Abstract
Dynamic compression tests were carried out to investigate dynamic properties of artificial frozen sand under active confining pressure.In the experiments,a variable cross-section split Hopkinson pressure bar (SHPB) apparatus with a diameter of 50 mm was employed.Frozen sand was sampled from-94.52 m level at a coalmine in Jining,Shandong province,and the ratio of length to diameter of the cylindrical frozen sand specimen was 0.5.The influence of confining pressure and strain rate on dynamic properties for artificial frozen sand was analyzed as well.The results show that under uniaxial loading condition,the stress-strain curve can be divided into four stages,i.e,,elastic stage,plastic stage,viscous stage and failure stage.Moreover,the corresponding failure mode is brittle.However,under confining pressure,the plastic stage has been extended,there is no viscous stage and crack failure occurred.Dynamic compressive strength of artificial frozen sand under confining pressure is greater than that under uniaxial loading condition,and increases with the increase of confining pressure.When the strain rate is 220 s-1 and the temperature is-15 ℃,under the confining pressures of 0.5 MPa,1.0 MPa,1.5 MPa and 2.0 MPa,dynamic compressive strengths are 1.19,1.40,1.58 and 1.81 times that under uniaxial loading condition,respectively.Strain convergence phenomenon occurs under different confining pressure conditions,and the convergence position tends to uniaxial loading condition.The dynamic compressive strength increased with the increase of strain rate.关键词
冻土力学/冻结砂土/分离式霍普金森压杆(SHPB)/主动围压/应变率Key words
frozen soil mechanics/frozen sand/split Hopkinson pressure bar (SHPB)/confining pressure/strain rate分类
建筑与水利引用本文复制引用
马冬冬,马芹永,袁璞,姚兆明..主动围压状态人工冻结砂土SHPB试验与分析[J].岩土力学,2017,38(10):2957-2961,2972,6.基金项目
国家自然科学基金(No.50874003) （No.50874003）
安徽理工大学研究生创新基金(No.2017CX1001).This work was supported by the National Natural Science Foundation of China (50874003) and the Innovation Fund for Graduate Students of Anhui University of Science and Technology (2017CX1001). （No.2017CX1001）
