高地应力下深部岩芯饼化裂缝发展规律及机制研究

doi:10.13722/j.cnki.jrme.2021.0547

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摘要以青海共和盆地干热岩调查井的钻孔岩芯为研究对象，首先分析现场岩芯饼化侧面破坏特征、端面断口宏观和微观特征，然后基于三维离散–连续混合方法，分析不同类型应力状态下钻孔取芯过程中的裂缝扩展行为，从细观角度探究岩芯饼化形成机制。研究结果表明：(1) 饼化岩芯侧面特征可分为破碎状、薄饼状、饼化状和厚饼状；端面断口形态可分为马鞍形、平面、杯状凹面和椭圆形，大多粗糙不平，具有凹凸性；(2) 岩芯饼化侧重于拉伸破坏机制；(3) 高水平主应力是岩芯饼化发生的主要因素，诱发带状分布裂缝并产生杯状凹面断口；垂向应力抑制裂缝带状分布，水平应力较小时，足够大的垂向应力可使岩芯产生平面断口；(4) 在应力重分布作用下，岩芯根部产生大量裂缝，岩芯上部的已有裂缝也会继续发展，加剧岩芯饼化程度；(5) 水平主应力差异性既影响裂缝的分布状态，也影响裂缝走向，裂缝走向倾向于沿最大水平主应力方向，且聚集分布在岩芯边缘附近区域；(6) 裂缝走向分布受应力水平的影响，沿最大水平主应力走向裂缝比例随最小水平主应力的减小或垂向应力的增大而增加，较大的最大水平主应力会削弱裂缝走向对应力方向的指示作用。

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	张丰收1
	2
	李猛利1
	2
	张重远3
	4
	何满潮1
	2
	4
	张盛生5
	衡德6

关键词 ：岩石力学, 岩芯饼化, 离散&ndash, 连续混合方法, 地应力, 裂缝扩展

Abstract：In this paper，the macro characteristics and micro scanning results of the discing cores from hot dry rock wells in Gonghe Basin，Qinghai Province were analyzed，and then，the fracture evolution in the process of core drilling under different types of stress states was analyzed to explore the underlying mechanism of core discing from the micro perspective using the hybrid DEM-continuum method. The following results can be drawn. Firstly，the observed shapes of discing cores can be divided into four types according to the thickness，i.e.，crushed discing，thin discing，discing and thick discing，and the fracture surfaces，most of which are rough and uneven，present saddle，flat，cup-shaped concave and ellipse shapes. Secondly，the rock core discing is attributed to the tensile failure. Thirdly，the high horizonal principal stress is the main factor inducing core discing and leads to the zonal distribution of fractures and the cup-shaped concave surface at the root of the cores. The vertical stress restrains the zonal distribution of fractures，and the high vertical stress could result in a flat-shaped section in the case of low horizonal stress. Fourthly，under the influence of the stress redistribution，a large amount of fractures generate at the root of the core and the existing fractures at the upper part of the core continue to develop，augmenting core discing. Fifthly，the horizontal stress difference affects both the distribution and the strike of the fractures. The strike of the fractures is mainly along the direction of the maximum horizontal stress，and the fractures gather near the core edge. Sixthly，the strike of the fractures is also affected by the three-dimensional stress level. The proportion of the fractures striking along the maximum horizontal stress increases with decreasing the minimum horizontal stress or increasing the vertical stress. However，the indication effect of the fracture strike on the stress direction is minimized under high maximum horizontal principal stress.

Key words： rock mechanics core discing hybrid DEM-continuum method in-situ stress fracture propagation

引用本文:

张丰收1，2，李猛利1，2，张重远3，4，何满潮1，2，4，张盛生5，衡德6. 高地应力下深部岩芯饼化裂缝发展规律及机制研究[J]. 岩石力学与工程学报, 2022, 41(3): 533-542.
ZHANG Fengshou1，2，LI Mengli1，2，ZHANG Chongyuan3，4，HE Manchao1，2，4，ZHANG Shengsheng5，HENG De6. Study on fracture propagation and formation mechanism of core discing at depth under high in-situ stresses. , 2022, 41(3): 533-542.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0547 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I3/533

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