基于能量耗散原理的盐岩动力特性及破坏特征分析

doi:10.13722/j.cnki.jrme.2016.0503

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摘要为研究盐岩的动力特性和破坏特征，利用带围压的分离式Hopkinson压杆(SHPB)试验装置，对盐岩进行不同围压(5，15和25 MPa)下的冲击试验，并基于能量耗散原理来研究盐岩动态力学性能以及破坏特征，分析整个试验过程中的能量传递与转化，探究围压和输入能量对试件吸能及破坏的影响。研究结果表明：在同一围压下，随着入射能的增加，盐岩硬化效应越明显，表现为能量反射率增高而透射能和吸收能降低；在相同或相近的入射能下，随着围压的升高盐岩的流塑性变得越明显，但在动力荷载下盐岩由流塑性向脆性转变，最后发生脆性破坏；随着吸收能的增加，盐岩的峰值应力因围压不同而表现出不同的变化趋势，低围压时，吸收能越大，峰值应力越高，而高围压时，吸收能越大，峰值应力却越小；在有围压状态下，盐岩的冲击破坏形态与其他的脆性岩石相似，但在破坏机制上存在很大差异。

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	尤业超1
	李二兵1
	谭跃虎1
	姜锡权2
	段建立1
	杨蒙1

关键词 ：岩石力学, 盐岩, 能量耗散原理, 分离式Hopkinson压杆(SHPB), 围压, 动力特性, 破坏特征

Abstract：In order to study the dynamic properties and failure characteristics of salt rock，the split Hopkinson pressure bar(SHPB) apparatus was used to conduct impact tests of salt rock under the confining pressures of 5，15 and 25 MPa. The dynamic properties and failure characteristics were studied based on the energy dissipation principle. The energy transmitting and transformation in the whole experimental process were analyzed in details，and the effect of the confining pressure and incident energy to the energy absorption and fracture of salt rock were studied specifically. Under the same confining pressure，the hardening effect of salt rock is more obvious with the increase of the incident energy，which can be explained as the reduction of the energy transmission/absorption rate and the increase of reflection rate. At the same or similar incident energy，the flow plasticity of salt rock becomes more obvious with the increase of confining pressure，but the salt rock changes from the flow plasticity to brittle under the dynamic loads and present brittle failure in the end. The peak stresses of salt rock show the different trends with the growth of energy absorption under the different confining pressures. Under the low confining pressures，the greater the energy absorption，the higher the peak stress. The peak stress decreases dramatically with the increasing of energy absorption under the high confining pressures. The impact fracture morphology of salt rock is similar to that of other brittle rocks under the condition of confining pressures，but there are intrinsic differences in damage mechanisms.

Key words： rock mechanics salt rock energy dissipation principle split Hopkinson pressure bar(SHPB) confining pressure dynamic property failure characteristics

引用本文:

尤业超1，李二兵1，谭跃虎1，姜锡权2，段建立1，杨蒙1. 基于能量耗散原理的盐岩动力特性及破坏特征分析[J]. 岩石力学与工程学报, 2017, 36(4): 843-851.
YOU Yechao1，LI Erbing1，TAN Yuehu1，JIANG Xiquan2，DUAN Jianli1，YANG Meng1. Analysis on dynamic properties and failure characteristics of salt rock based on energy dissipation principle. , 2017, 36(4): 843-851.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2016.0503 或 http://www.rockmech.org/CN/Y2017/V36/I4/843

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