三向应力下花岗岩水力剪切和渗流试验研究

doi:10.13722/j.cnki.jrme.2023.0768

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摘要为揭示三向应力作用下干热岩水力剪切对岩体渗透特性影响机制，采用自制耐高温真三轴水力剪切试验装置和渗透率测试系统，以松辽盆地大庆地区花岗岩为研究对象，将预制裂隙花岗岩进行高温处理，通过改变三向应力、注水压力、注水流量和时长模拟不同热储地质特性，利用裂隙面粗糙度系数表征裂隙水力剪切前后变化特征，进行不同三向应力下注水参数对花岗岩水力剪切后裂隙渗透率影响试验。研究结果表明：(1) 花岗岩质量损失率和孔隙率随温度增加而增加，抗拉–压强度随温度增加而降低；(2) 不同孔隙压和温度作用下裂隙渗透率均随体积应力增大而减小，150 ℃～350 ℃时裂隙渗透率由10－17 m2量级增长到10－16 m2量级；(3) 水力剪切最大注水压力与体积应力间服从二次多项式规律分布，体积应力18.5 MPa时最大注水压力为4.78 MPa；(4) 水力剪切后花岗岩裂隙渗透率随注水流量增加而增加，随注水时长先增加后稳定或降低；(5) 不同体积应力、注水流量和时长水力剪切后裂隙面粗糙度系数均降低，表明花岗岩裂隙面在水力剪切后更光滑渗流能力提高。

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	唐巨鹏1
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	余泓浩2
	魏志豪2
	张枭2

关键词 ：岩石力学, 水力剪切, 三向应力, 渗透率

Abstract：To reveal the influence mechanism of hydraulic shear on the permeability characteristics of hot dry rock under three-dimensional stress. The self-made high temperature true triaxial hydraulic shear test device and permeability test system were used. The granite in Daqing area of Songliao Basin is taken as the research object. Prefabricated fractured granite is treated at high temperature. The geological characteristics of different thermal reservoirs are simulated by changing the three-dimensional stress，water injection pressure，flow rate and time. The roughness coefficient of fracture surface is used to describe the variation characteristics of fracture before and after hydraulic shear. The influence of water injection parameters on fracture permeability after hydraulic shear of granite under different three-dimensional stresses was tested. The results show that：(1) the mass loss rate and porosity of granite increase with the increase of temperature，and the tensile-compressive strength decreases with the increase of temperature. (2) The fracture permeability decreases with the increase of volume stress under different pore pressure and temperature. The fracture permeability increases from 10－17 m2 to 10－16 m2 at 150 ℃–350 ℃. (3) The relationship between the maximum water injection pressure and the volumetric stress obeys the quadratic polynomial distribution. The maximum water injection pressure is 4.78 MPa when the volumetric stress is 18.5 MPa. (4) After hydraulic shearing，the fracture permeability of granite increases with the increase of water injection flow rate，and increases first and then stabilizes or decreases with the increase of water injection time. (5) The roughness coefficient of fracture surface decreases after hydraulic shear with different volume stress，water injection flow rate and time，which indicates that the seepage capacity of granite fracture surface is improved after hydraulic shear.

Key words： rock mechanics hydraulic shear three-dimensional stress permeability

引用本文:

唐巨鹏1，2，3，余泓浩2，魏志豪2，张枭2. 三向应力下花岗岩水力剪切和渗流试验研究[J]. 岩石力学与工程学报, 2024, 43(4): 797-808.
TANG Jupeng1，2，3，YU Honghao2，WEI Zhihao2，ZHANG Xiao2. Experimental study on hydraulic shear and seepage of granite under three-dimensional stress. , 2024, 43(4): 797-808.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0768 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I4/797

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