裂隙分布对石灰岩力学性能影响研究

doi:10.13722/j.cnki.jrme.2024.0491

Abstract
Figure/Table
References (0)
Related Citation (15)

Download: PDF (2152 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract In order to study the dependence of the mechanical properties of fractured hard rocks，including their strength，deformability，failure mode，characteristic of energy dissipation and bursting liability，on fracture distribution and volumetric or areal damage variable，uniaxial compression tests were carried out on limestone specimens with a single fracture，three coplanar and non-coplanar fractures at different inclination angles. The results show that：(1) the elastic deformation is mainly affected by the volumetric damage variable，while the strength is mainly affected by the areal damage variable. For the specimens with a single fracture，the unified Young?s modulus and peak strength increase monotonically with the fracture inclination angle，and the relation between the unified Young?s modulus or peak strength and the component of Oda?s second-order volumetric damage tensor or areal damage vector along the loading direction，can be well fitted with an inverse proportional power function. For the specimens with three coplanar or non-coplanar fractures，both the curves of the unified Young?s modulus and peak strength with the fracture inclination angle are W and V shapes respectively，and prediction for their upper limit and average can be given by the above relations with the component of volumetric and areal damage tensors obtained from the specimens with a single fracture respectively. (2) In general，the fractured limestone specimen may undergone three damage evolution stages，i.e.，initiation and propagation of cracks，formation of macroscopic failure surface(zone) and residual deformation. There are three basic failure modes：split，stepped and blocky failure. (3) Some of the limestone specimens show certain degree ductile characteristics due to the existence of the fractures，namely，their stress-strain curves change from single peak to multi-peaks. For the specimens with single peak stress-strain curve(type I)，the elastic energy accumulated before the peak stress is rapidly transformed into dissipated energy. For the specimens with multi-peaks stress-strain curves(type II and III，multi-peaks during softening and hardening stages，respectively)，the elastic energy accumulated before each peak stress is released and transformed into dissipated energy step by step. Both the unified total strain energy and energy storage limit of the specimen may increase linearly with the unified peak strength，and therefore is inversely proportional to the component of the two damage tensors. and (4) Both the intact and fractured limestone specimens at failure appeared different degrees of bursting phenomena such as particle ejection and making sound. Compared with the elastic strain energy index and bursting energy index，the comprehensive index of elastic strain and bursting energy(the ratio of the elastic strain energy before the peak strength to the total strain energy)，can more reasonably represent the bursting liability of the fractured specimens with multi-peaks stress-strain curve，and coincide very well with the degrees of bursting intensity observed in the test.

Key words： rock mechanics limestone uniiaxial compression fracture distribution energy dissipation bursting liability

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	CHEN Xin1
	2
	LI Zi1
	2
	QING Shaoshuai1
	2
	WANG Yang1
	2
	MA Botao3
	ZHANG Mansheng3
	LIU Jintai3

Cite this article:

CHEN Xin1,2,LI Zi1, et al. Study on the influence of fracture distribution on mechanical properties of limestone[J]. , 2024, 43(12): 2861-2873.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2024.0491 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I12/2861

[1]	DERSHOWITZ W S，EINSTEIN H H. Characterizing rock joint geometry with joint system models[J]. Rock Mechanics and Rock Engineering，1988，21(1)：21-51.
[2]	LAJTAI E Z. Strength of discontinuous rocks in direct shear. Geotechnique，1969，19(2)：218-233.
[3]	GEHLE C，KUTTER H K. Breakage and shear behaviour of intermittent rock joints[J]. International Journal of Rock Mechanics and Mining Sciences，2003，40(5)：687-700.
[4]	白世伟，任伟中，丰定祥，等. 共面闭合断续节理岩体强度特性直剪试验研究[J]. 岩土力学，1999，20(2)：10-16.(BAI Shiwei，REN Weizhong，FENG Dingxiang，et al. Research on the strength behavior of rock containing coplanar close intermittent joints by direct shear test[J]. Rock and Soil Mechanics，1999，20(2)：10-16.(in Chinese))
[5]	HAYASHI M. Strength and dialatancy of brittle jointed mass-the extreme value stochastic and anisotropic failure mechanism[C]// Proceedings of the first Congress of the International Society of Rock Mechanics. Lisbon：[s. n.]，1966：295-302.
[6]	WONG R H C，CHAU K T. The coalescence of frictional cracks and the shear zone formation in brittle solids under compressive stresses[J]. International Journal of Rock Mechanics and Mining Sciences，1997，34(3/4)：335.
[7]	SAGONG M，BOBET A. Coalescence of multiple flaws in a rock-model material in uniaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences，2002，39(2)：229-241.
[8]	陈新，廖志红，李德建. 节理倾角及连通率对岩体强度、变形影响的单轴压缩试验研究[J]. 岩石力学与工程学报，2011，30(4)：781-789.(CHEN Xin，LIAO Zhihong，LI Dejian. Experimental study on the effect of joint orientation and persistence on the strength and deformation properties of rock masses under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(4)：781-789.(in Chinese))
[9]	PRUDENCIO M，JAN M V S. Strength and failure modes of rock mass models with non-persistent joints[J]. International Journal of Rock Mechanics and Mining Sciences，2007，44(6)：890-902.
[10]	YANG S Q，JIANG Y Z，XU W Y，et al. Experimental investigation on strength and failure behavior of pre-cracked marble under conventional triaxial compression[J]. International Journal of Solids and Structures，2008，45(17)：4 796-4 819.
[11]	董晋鹏，杨圣奇，李斌，等. 共面双裂隙类岩石材料抗拉强度试验研究[J]. 工程力学，2020，37(3)：188-201.(DONG Jinpeng，YANG Shengqi，LI Bin，et al. Experimental study on the tensile strength of rock-like materials containing two pre-existing coplanar fissures[J]. Engineering Mechanics，2020，37(3)：188-201.(in Chinese))
[12]	ODA M，SUZUKI K，MAESHIBU T. Elastic compliance for rock-like materials[J]. Soils and Foundations，1984，24(3)：27-40.
[13]	KAWAMOTO T，ICHIKAWA Y，KYOYA T. Deformation and fracturing behaviour of discontinuous rock mass and damage mechanics theory[J]. International Journal for Numerical and Analytical Methods in Geomechanics，1988，12(1)：1-30.
[14]	CHEN X，BA?ANT Z P. Microplane damage model for jointed rock masses[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2014，38(14)：1 431-1 452.
[15]	张亮，王桂林，雷瑞德，等. 单轴压缩下不同长度单裂隙岩体能量损伤演化机制[J]. 中国公路学报，2021，34(1)：24-34. (ZHANG Liang，WANG Guilin，LEI Ruide，et al. Energy damage evolution mechanism of single jointed rock mass with different lengths under uniaxial compression[J]. China Journal of Highway and Transport，2021，34(1)：24-34.(in Chinese))
[16]	陈新，马伯涛，李佩禅，等. 单轴压缩下节理试件的能量耗散特征研究[J]. 金属矿山，2022，550(4)：23-30.(CHEN Xin，MA Botao，LI Peichan，et al. Study on characteristic of energy dissipation for jointed specimens under uniaxial compression[J]. Metal Mine，2022，550(4)：23-30.(in Chinese))
[17]	朱志洁，姚振华，王来贵，等. 裂隙分布对煤岩体冲击倾向性影响机制试验研究. 采矿与安全工程学报，2023，40(3)：554-562. (ZHU Zhijie，YAO Zhenhua，WANG Laigui，et al. Experimental study on the influence mechanism of cracks distribution on coal-rock bursting liability[J]. Journal of Mining and Safety Engineering，2023，40(3)：554-562.(in Chinese))
[18]	ODA M，YAMABE T，ISHIZUKA Y，et al. Elastic stress and strain in jointed rock masses by means of crack tensor analysis[J]. Rock Mechanics and Rock Engineering，1993，26(2)：89-112.
[19]	KACHANOV L M. Time of rupture process under creep conditions[J]. Izvestiia Akademii Nauk SSSR Seriia Biologicheskaia，1958，8：26-31.
[20]	KRAJCINOVIC D. Continuous damage mechanics revisited：basic concepts and definitions[J]. Journal of Applied Mechanics，1985，52(4)：829-834.
[21]	CHEN X，LIAO Z H，PENG X. Deformability characteristics of jointed rock masses under uniaxial compression[J]. International Journal of Mining Science and Technology，2012，22(2)：213-221.
[22]	中华人民共和国行业标准编写组. MT/T 174—2000煤层冲击倾向性分类及指数的测定方法[S]. 北京：煤炭工业出版社，2000.(The Professional Standards Compilation Group of People?s Republic of China. MT/T 174—2000 Classification and laboratory test method on bursting liability of coal[S]. Beijing：Coal Industry Press，2000.(in Chinese))
[23]	ANDREEV G E. Brittle failure of rock materials：test results and constitutive models[M]. Netherlands：A. A. Balkema Press，1995：123.