Research on mechanical behaviors and failure modes of layer shale

JIA Chang-gui; CHEN Jun-hai; GUO Yin-tong; YANG Chun-he; XU Jing-bin; WANG Lei

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Research on mechanical behaviors and failure modes of layer shale

更新时间：2026-06-25

- Research on mechanical behaviors and failure modes of layer shale
- Vol. 34, Issue S2, (2013)
- 作者机构：
  
  1. 中国石油化工股份有限公司石油工程技术研究院,北京,100101
  2. 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,武汉,430071
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU45
- Online First：19 November 2013，
  
  Published：2013
- 稿件说明：
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JIA Chang-gui, CHEN Jun-hai, GUO Yin-tong, et al. Research on mechanical behaviors and failure modes of layer shale[J]. 2013, 34(S2).
DOI：

JIA Chang-gui, CHEN Jun-hai, GUO Yin-tong, et al. Research on mechanical behaviors and failure modes of layer shale[J]. 2013, 34(S2). DOI：

摘要

采用MTS815型岩石力学试验机进行了页岩层理面不同角度取芯的力学试验，获得了其力学参数及破坏模式特征。试验表明：层理面不同角度试样力学性质存在较大差异性，平行层理面试样其抗压强度最高，与层理面夹角为30°时抗压强度最低，弹性模量随取芯角度的增加逐渐降低。单轴压缩，夹角为0°时破坏模式主要为沿多个平行层理面竖向劈裂，夹角为30°时沿层理弱面剪切破坏，夹角为60°时为大角度剪切破坏并贯穿60°弱层理面，夹角为90°时主要为层状拉张破坏。三轴压缩，夹角为0°时试样有多条破裂面，呈劈裂与剪切破坏共同作用；夹角为30°时，沿层理面剪切破坏；夹角为60°时，呈现剪切破坏，剪切破裂面与水平面夹角在45°~50°之间；夹角为90°时，以剪切破坏为主，有多条平行开裂层面。页岩层理面表现出明显的弱面特征，研究结果为水力压裂施工设计提供了技术参数。

Abstract

The mechanical characteristics of shale with different beddings coring were investigated by MTS815 rock mechanical test system. The failure modes，deformation and strength characteristics are obtained. The results indicate that: (1) It shows significantly different properties

when the sample paralleled to bedding plane; it has maximum value of compressive strength and minimum value when the sample has a angle of 30° with bedding plane. The elastic modulus deceases with the increase of the coring angle. (2) Under the condition of uniaxial compression

the angle of 0°

the main failure mode is split failure along the beddings; the angle of 30°

it is shear failure along the weakness plane

the angle of 60°

it is wide-angle shear failure along the weakness plane; the angle of 90°

it is stretch-draw failure. (3) Under the condition of triaxial compression

angle of 0°

it shows several failure surfaces

combined split and shear failure actions; the angle of 30°

it shows shear failure along to the beddings; the angle of 60°

it shows shear failure and the angle of failure surface is 45° to 50°; the angle of 90°

it shows shear failure and it has several parallel failure surfaces. The results can provide an important way for fracture optimization design.

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