微裂隙对花岗岩力学性质影响的阈值研究

doi:10.13722/j.cnki.jrme.2017.1324

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摘要通过对高放废物地质处置阿拉善预选区巴彦诺日公花岗岩进行单轴压缩试验和薄片鉴定，研究微裂隙对花岗岩力学性质的影响。首先，采用面积裂隙线密度对花岗岩中的微裂隙进行量化。根据单轴压缩下全应力–应变曲线，求取花岗岩的力学参数。研究微裂隙密度与岩石的力学性质之间的关系。结果表明，微裂隙对花岗岩的单轴抗压强度和变形模量有明显的影响，且存在一个微裂隙线密度阈值，当微裂隙线密度大于该阈值，和单轴抗压强度、变形模量具有很好的相关性；小于该阈值，相关性很差，微裂隙对岩石力学性质的影响主要不是表现在线密度上。

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	袁广祥1
	王朋姣2
	张路青3
	曾庆利3
	黄志全1
	尚彦军3
	4
	王洪建1

关键词 ：岩石力学, 花岗岩, 微裂隙, 力学性质, 阈值

Abstract：To obtain the relationship between microcracks and mechanical properties，slice identification and mechanical test were carried out，in which the samples were from Bayannuorigong granite mass in Alxa pre-selected region for geological disposal of high-level nuclear waste. Firstly，the microcracks are quantified by area crack linear density. Uniaxial compression tests for standard cylindrical granite samples were conducted using electro-hydraulic servo testing machine. The mechanical parameters of granite were obtained from complete stress-strain curves under uniaxial compression. The relationship between area crack linear density and mechanical parameters was researched. The results show that there is a threshold about the effect of microcracks on granite uniaxial compressive strength and deformation modulus. When the microcrack linear density is greater than the threshold，it has a good correlation with uniaxial compressive strength and deformation modulus. Otherwise，their correlation is very poor，and the effect of microcracks linear density on the mechanical properties of rocks is not obvious.

Key words： rock mechanics granite microcrack mechanical property threshold

引用本文:

袁广祥1，王朋姣2，张路青3，曾庆利3，黄志全1，尚彦军3，4，王洪建1. 微裂隙对花岗岩力学性质影响的阈值研究[J]. 岩石力学与工程学报, 2019, 38(S1): 2646-2653.
YUAN Guangxiang1，WANG Pengjiao2，ZHANG Luqing3，ZENG Qingli3，HUANG Zhiquan1，SHANG Yanjun3，4，WANG Hongjian1. The thresholds about effect of microcrack on mechanical properties for granite. , 2019, 38(S1): 2646-2653.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.1324 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS1/2646

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