不同加载率下水饱和砂岩的力学特性研究

doi:10.13722/j.cnki.jrme.2018.0571

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Abstract

To investigate the combined effects of water saturation and loading rate on rock mechanics，a series of dynamic compression，tension and fracture tests are conducted on both dry and saturated sandstone specimens using the split Hopkinson pressure bar(SHPB) system. Test results show that，under static loads，both strength and fracture toughness have different degrees of reduction after the specimen was saturated. Under dynamic loads，the strength and fracture toughness increase with the increase of loading rate，and the saturated specimen has higher rate dependences for each mechanical property compared with that of dry ones. Under high loading rates，free water inside the rock specimen can induce inertial effect，meniscus effect and viscosity effect，which prevent the initiation and propagation of cracks. Particularly，when the loading rate exceeds 1 290 GPa/s，the compressive strength of saturated specimen can even be greater than that of dry specimen.

Key words： rock mechanics water saturation sandstone split Hopkinson pressure bar(SHPB) rock dynamics rate dependence

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	Articles by authors
	ZHOU Zilong
	CAI Xin
	ZHOU Jing
	CHENG Ruishan

Cite this article:

ZHOU Zilong,CAI Xin,ZHOU Jing, et al. Mechanical properties of saturated sandstone under different loading rates[J]. , 2018, 37(S2): 4069-4075.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0571 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/4069

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