Damage Creep Model and Application for Sandy Mudstone Considering the Effect of Immersion Deterioration

IF 1.5 4区 工程技术 Q3 MECHANICS
Zhitao Ma, Wenhu Liu, Hanwen Xu, Yujia Huo, Yipeng Wang, Shunhai Li
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引用次数: 0

Abstract

Aiming at the problem of performance degradation and large deformation of sandy mudstone after immersion in water, the compression test is carried out. The damage and deterioration law of strength and elastic modulus of immersed rock mass is analyzed, and the function relationship between rock damage variable and soaking time is obtained by fitting. Combined with Hoek-Brown criterion and Mohr-Coulomb criterion, the calculation method of instantaneous cohesion and instantaneous internal friction angle of damaged rock mass is derived based on tangent method, and the equivalent Mohr-Coulomb criterion which can effectively characterize the nonlinear strength characteristics of damaged rock mass is given. Based on the built-in creep model Cvisc of Flac3D, a damage creep model is given by introducing the damage factor and nonlinear strength criterion of immersed rock mass, which is more suitable for describing the creep characteristics of immersed sandy mudstone. The validity of the model is verified by comparing with the measured results.
考虑浸水劣化效应的砂质泥岩损伤蠕变模型及应用
针对砂质泥岩浸水后的性能退化和大变形问题,进行了抗压试验。分析了浸水岩体强度和弹性模量的破坏和劣化规律,通过拟合得到了岩体破坏变量与浸水时间的函数关系。结合 Hoek-Brown 准则和 Mohr-Coulomb 准则,基于切线法推导出了受损岩体瞬时内聚力和瞬时内摩擦角的计算方法,并给出了能有效表征受损岩体非线性强度特征的等效 Mohr-Coulomb 准则。在 Flac3D 内置蠕变模型 Cvisc 的基础上,通过引入损伤因子和浸入岩体的非线性强度准则,给出了更适合描述砂质泥岩浸入蠕变特征的损伤蠕变模型。通过与测量结果比较,验证了该模型的有效性。
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来源期刊
Journal of Mechanics
Journal of Mechanics 物理-力学
CiteScore
3.20
自引率
11.80%
发文量
20
审稿时长
6 months
期刊介绍: The objective of the Journal of Mechanics is to provide an international forum to foster exchange of ideas among mechanics communities in different parts of world. The Journal of Mechanics publishes original research in all fields of theoretical and applied mechanics. The Journal especially welcomes papers that are related to recent technological advances. The contributions, which may be analytical, experimental or numerical, should be of significance to the progress of mechanics. Papers which are merely illustrations of established principles and procedures will generally not be accepted. Reports that are of technical interest are published as short articles. Review articles are published only by invitation.
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