不同长度石灰岩动态压缩力学性质试验研究

doi:10.13722/j.cnki.jrme.2018.0646

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Abstract

In order to study the size effect of rock mechanics under high strain rate，f50 mm split Hopkinson pressure bars(SHPB) was used to carry out impact loading test for 12 types of limestone specimens with diameter of 50 mm and length of 15 mm to 100 mm. The results show that the single axis dynamic compressive strength of limestone specimens has obvious size effect，and the dynamic compressive strength increases first and then decreases with the change of the length of the specimen. The strength of the specimen is the maximum at the length of 60 mm，and the stress strain curve of the specimen with a length of 15 mm to 35 mm is larger and the length of the specimen is more than 35 mm. With the increase of the length of the specimen，the stress strain curve generally has little change. With the increase of the length of the specimen，the peak strain of the specimen decreases，and the dynamic elastic modulus of the specimen increases first and then decreases when the length of the specimen is 60 mm，and the fracture degree is first with the increase of the length of the specimen. There is a correlation between the decreasing trend and the increase trend. The greater the strength is，the weaker the failure is.

Key words： rock dynamics size effect SHPB dynamic strength

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	Articles by authors
	PING Qi1
	2
	3
	ZHANG Hao2
	3
	SU Haipeng2
	3

Cite this article:

PING Qi1,2,3, et al. Study on dynamic compression mechanical properties of limestone with different lengths[J]. , 2018, 37(S2): 3891-3897.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0646 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/3891

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