基于数字图像技术的类岩材料直剪破坏试验研究
DOI:
作者:
作者单位:

1.河北工程大学 水利水电学院;2.河北工程大学 河北省智慧水利重点实验室

作者简介:

通讯作者:

中图分类号:

TU452

基金项目:

河北省自然科学基金项目(E2020402087)


Experimental study on direct shear failure of rock-like materials based on digital image technology
Author:
Affiliation:

1.College of Water Conservancy and Hydroelectric Power,Hebei University of Engineering;2.Hebei Key Laboratory of Intelligent Water Conservancy, Hebei University of Engineering.

Fund Project:

Hebei Province Natural Science Foundation project(E2020402087)

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    摘要:

    为研究裂隙倾角对岩体破裂失稳以及变形场的影响,分别制作了倾角为0°、15°、30°、45°、60°、75°和90°的7种预制单裂隙类岩试样,利用ZTRS-210岩石直剪仪和非接触全场应变测量系统进行直剪试验,并对裂纹扩展和全场应变进行同步监测。结果表明:类岩材料的峰值剪应力随裂隙倾角增加表现出增-减-增-减的趋势,裂隙倾角15°时最大,60°时最小;随着裂隙倾角的增加,试样的破坏模式由共面剪切破坏向拉剪复合破坏转变,倾角90°时为沿剪切面剪切破坏,并伴随较多的次生裂纹;相同倾角时,应变场随荷载增加由应变均匀分布转变为应变集中分布;应变均方差在压密阶段以及弹性阶段较小且增长缓慢,在塑性阶段以及破坏阶段骤增。研究结果可为岩体工程稳定性分析提一定的参考。

    Abstract:

    In order to study the influence of the inclination angle of the fracture on the failure and instability of the rock mass and the deformation field, 7 kinds of prefabricated single fissure rock-like samples with inclination angles of 0°, 15°, 30°, 45°, 60°, 75° and 90° were produced. In this way, the ZTRS-210 rock direct shear tester and the non-contact full-field strain measurement system are used for direct-shear testing, and the crack propagation and the full-field strain are simultaneously monitored. The results show that the peak shear stress of rock-like materials shows a trend of increasing-decreasing-increasing-decreasing with the increase of fracture inclination Angle, and the peak shear stress is the maximum when the fracture inclination Angle is 15° and the minimum when the fracture inclination Angle is 60°.With the increase of the crack inclination angle, the failure mode of the specimen changes from coplanar shear failure to tensile-shear composite failure. When the inclination angle is 90°, it is shear failure along the shear plane, accompanied by more secondary cracks; With the same dip Angle, the strain field changes from uniform strain distribution to concentrated strain distribution with the increase of load. The strain mean square error curve is smaller and grows slowly in the micro-crack compaction stage and the elastic stage, and it increases sharply in the plastic stage and the failure stage.The results can be reference for the engineering rock mass stability analysis.

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宿辉,李鸿亮,马秋娟,等. 基于数字图像技术的类岩材料直剪破坏试验研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-12-09
  • 最后修改日期:2022-04-19
  • 录用日期:2022-04-30
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