The relationship between dynamic strength and strain rate and damage to rock materials subjected to dynamic cyclic loading

doi:10.1007/s40948-021-00287-w

	The relationship between dynamic strength and strain rate and damage to rock materials subjected to dynamic cyclic loading
	Zhou, Yongqiang 1; Sheng, Qian 1,2; Li, Nana 3; Fu, Xiaodong 1
刊名	GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
	2021-08-01
卷号	7 期号:3 页码:18
关键词	Damage Strain rate Rock material Damage-controlled dynamic cyclic loading Dynamic strength
ISSN号	2363-8419
DOI	10.1007/s40948-021-00287-w
英文摘要	Induced and natural earthquakes will put the rock underground engineering in a state of dangerous destruction during the mining of resources, such as oil and gas. The form of seismic load is regarded as a dynamic cyclic load in general. Generally, the strain rate has a significant influence on the mechanical properties of rock materials, such as strength, subjected to dynamic load and rock materials will suffer damage under cyclic loading; however, the relationship between dynamic strength and a damage variable and strain rate remains unclear when establishing the expression of strength of rock materials under action of dynamic cyclic loading. Therefore, four rock materials were chosen to study whether strain rate affects damage of rock materials subjected to damage-controlled dynamic cyclic loading. Based on the principle of energy dissipation, a modified definition of a damage variable for rock materials subjected to damage-controlled dynamic cyclic loading was proposed by considering the strength of rock materials. Using the proposed damage variable, the relationship between the damage variable at different proportions of peak strength of post-peak stage and strain rate was analyzed in detail. It can be found that the peak strength of these rock materials and the logarithm of the strain rate follow a linear relationship, however, damage variables at different proportions of peak strength of post-peak stage, such as peak strength, 80%, 60%, and 40% of peak strength, vary with different strain rates or loading frequencies. Further, the relation between strain rate/loading frequency and the damage variable of these rock materials differs from each other. Therefore, a hypothesis that no consistent relationship exists between damage variable and loading rate for rock materials when subjected to dynamic cyclic loading was proposed. On this basis, the functional expression of dynamic compressive strength of rock materials under dynamic cyclic loading with independent variables of damage and strain rate was established.
资助项目	National Natural Science Foundation of China[51809258]
WOS研究方向	Energy & Fuels ; Engineering ; Geology
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000681746400001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27614]
专题	中科院武汉岩土力学所
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Wuhan Lib, Wuhan, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Yongqiang,Sheng, Qian,Li, Nana,et al. The relationship between dynamic strength and strain rate and damage to rock materials subjected to dynamic cyclic loading[J]. GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES,2021,7(3):18.
APA	Zhou, Yongqiang,Sheng, Qian,Li, Nana,&Fu, Xiaodong.(2021).The relationship between dynamic strength and strain rate and damage to rock materials subjected to dynamic cyclic loading.GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES,7(3),18.
MLA	Zhou, Yongqiang,et al."The relationship between dynamic strength and strain rate and damage to rock materials subjected to dynamic cyclic loading".GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES 7.3(2021):18.