Experimental study of mechanical behaviours of shale under different confining pressures and different strain rates

LIU Jun-xin; ZHANG Ke; LIU Wei; SHI Xi-lin

doi:10.16285/j.rsm.2017.S1.005

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Experimental study of mechanical behaviours of shale under different confining pressures and different strain rates

更新时间：2026-06-25

- Experimental study of mechanical behaviours of shale under different confining pressures and different strain rates
- Vol. 38, Issue S1, Pages: 43-52(2017)
- 作者机构：
  
  1. 重庆大学煤矿灾害动力学与控制国家重点实验室,重庆,400044
  2. 西南科技大学土木与建筑工程学院,四川,绵阳,621010
  3. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北,武汉,430071
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2017.S1.005
  CLC： TU452
- Online First：05 June 2018，
  
  Published：2017
- 稿件说明：
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LIU Jun-xin, ZHANG Ke, LIU Wei, et al. Experimental study of mechanical behaviours of shale under different confining pressures and different strain rates[J]. 2017, 38(S1): 43-52.
DOI：

LIU Jun-xin, ZHANG Ke, LIU Wei, et al. Experimental study of mechanical behaviours of shale under different confining pressures and different strain rates[J]. 2017, 38(S1): 43-52. DOI： 10.16285/j.rsm.2017.S1.005.

摘要

为揭示围压及应变速率对页岩力学特性的影响规律，对志留统龙马溪组页岩试样开展了不同围压及不同应变率下的三轴压缩力学试验研究。结果表明，围压和应变率对页岩的弹性模量、峰值强度及破裂形态等均具有显著影响，弹性模量和峰值强度均随围压的升高而增加，峰值强度增加的幅度明显大于弹性模量，峰值强度呈线性增加趋势，低围压时应变率从低到高，弹性模量和峰值强度都呈逐渐升高的趋势，两者与应变率对数的关系可用二次多项式描述；随着围压增大，页岩的应变率效应逐渐减弱，在较高高围压（50 MPa）下峰值强度和弹性模量随应变速率增加而增加现象均变得极不显著。对试验后岩样的破坏模式进行分析可知，页岩在低围压高应变率状态下主要是劈裂–剪切破坏，随着围压的增加和应变率的减小，试样的破坏由脆性劈裂–剪切破坏向单一剪切破坏转变，再逐渐向延性破坏过渡。研究结果对于合理确立页岩力学参数及设计压裂方案具有较好的参考。

Abstract

To investigate the mechanical properties of shale under different confining pressures and different strain rates

the triaxial compression experiments of Longmaxi Group shale samples are conducted under different confining pressures and different strain rates. The experimental results show that the confining pressure and strain rate affect obviously elastic modulus

peak strength and fracture morphology of the shale. The elastic modulus and peak strength increase with the increase of confining pressure

the increase of peak strength is significantly greater than thaengtht of the elastic modulus; and the peak strength showed a linear increasing trend. At a low confining pressure

elastic modulus and peak strength gradually increase along with the inclining of strain rate from low to high; the relationship between the two and the strain rate can be described by a biquadratic polynomial. With the increase of confining pressure

the effect of strain rate on the shale is gradually weakened; at a high confining pressure of 50 MPa

the phenomenon of the compressive strength and elastic modulus increase with the increase of strain rate is terminated. Under condition of low confining pressure and high strain rate

the shale is mainly split shear failure; with the increase of confining pressure and the decrease of strain rate

the failure mode would change from split shear failure to single shear failure; and then gradually transits to a ductile fracture. The results of the test have important guiding roles in establishing the mechanical parameters of shale and designing the fracturing program.

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