水化学作用下钙质砂岩力学特性的劣化及能量机制试验研究

doi:10.13722/j.cnki.jrme.2015.0990

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Abstract

The deformation and failure of rock are closely relative to the change of energy in the loading process. In order to study the influences of different water chemical solutions on mechanical properties and energy mechanism of calcareous sandstone，uniaxial compression test is carried out under chemical corrosion and natural samples by WDT–1500 reactive material testing machine. The experimental results show that the water chemical solution has a significant effect on the strength and deformation characteristics of calcareous sandstone. The corrosion strength characteristics and anti deformation ability of specimens have different degrees of deterioration after the corrosion，and it has the obvious stage to time. There is the clear BDT(brittle-ductile transformation) property in the test. The corresponding portions of the strain energy of chemical corroded sandstone specimens are less than corresponding values of natural specimens. The energy stored by the form of releasable elastic strain energy percentage of the absorbed strain energy decreases，and the longer the chemical corrosion，the smaller the U^e/U. The effects of pH，concentration and composition of chemical solution on the corresponding portions of the strain energy at peak stress are significant，which shows that water chemical solution has obvious influence on the total absorbed energy U and energy storage limit. The longer the chemical corrosion，the stronger corrosion degree of the same chemical solution on sandstone specimens，and the total absorbed energy U and dissipated energy increase，but the time effect of releasable elastic strain energy is not obvious. The real-time evolution process of calcareous sandstone specimens can be divided into different stages.

Key words： rock mechanics calcareous sandstone chemical erosion mechanical properties energy feature dissipated energy peak strain pre-peak plastic deformation

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	Articles by authors
	HAN Tielin1
	2
	SHI Junping 2
	CHEN Yunsheng1
	2
	LI Zhihui2
	MA Wentao3

Cite this article:

HAN Tielin1,2,SHI Junping 2, et al. EXPERIMENTAL STUDY OF MECHANICAL PROPERTIES AND ENERGY MECHANISM OF CALCAREOUS SANDSTONE SUBJECTED TO WATER CHEMISTRY[J]. , 2015, 34(S2): 3793-3804.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.0990 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/IS2/3793

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