检索结果-南通市图书馆

Multiscale modeling of gas-induced fracturing in anisotropic clayey rocks

Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 2091-2110页

作者： Jianxiong Yang Jianfeng Liu Zhengyuan Qin Xuhai Tang Houquan Zhang State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu610042China School of Resources and Safety Engineering Wuhan Institute of TechnologyWuhan430073China School of Civil Engineering Wuhan UniversityWuhan430072China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou221116China

In the context of repositories for nuclear waste,understanding the behavior of gas migration through clayey rocks with inherent anisotropy is crucial for assessing the safety of geological disposal facilities.The primary mechanism for gas breakthrough is the opening of micro-fractures due to high gas pressure.This occurs at gas pressures lower than the combined strength of the rock and its minimum principal stress under external loading conditions.To investigate the mechanism of microscale mode-I ruptures,it is essential to incorporate a multiscale approach that includes subcritical microcracks in the modeling framework.In this contribution,we derive the model from microstructures that contain periodically distributed microcracks within a porous material.The damage evolution law is coupled with the macroscopic poroelastic system by employing the asymptotic homogenization method and considering the inherent hydro-mechanical(HM)anisotropy at the microscale.The resulting permeability change induced by fracture opening is implicitly integrated into the gas flow equation.Verification examples are presented to validate the developed model step by step.An analysis of local macroscopic response is undertaken to underscore the influence of factors such as strain rate,initial damage,and applied stress,on the gas migration process.Numerical examples of direct tension tests are used to demonstrate the model’s efficacy in describing localized failure characteristics.Finally,the simulation results for preferential gas flow reveal the robustness of the two-scale model in explicitly depicting gas-induced fracturing in anisotropic clayey rocks.The model successfully captures the common behaviors observed in laboratory experiments,such as a sudden drop in gas injection pressure,rapid build-up of downstream gas pressure,and steady-state gas flow following gas breakthrough.

关键词： Deep geological repositories Mode-I microcracks Time-dependent damage fracturing process Anisotropic rock

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Solid–Liquid Composites with High Impact Resistance

引用

Acta Mechanica Solida Sinica 2021年第6期34卷 911-921页

作者： Miao Yu Xiying Li Pengyu Lv Huiling Duan Department of Mechanics and Engineering Science College of EngineeringPeking UniversityBeijing100871China CAPT HEDPS and IFSA Collaborative Innovation Center of MoEPeking UniversityBeijing100871China

Solid–liquid composites(SLCs)with novel thermal/electronic/mechanical properties imparted by programmable and functional liquid inclusions have attracted considerable research interest in recent years,and are widely used in smart electronics and soft robotics.The feasible application of SLCs requires that they exhibit excellent static physical properties as well as dynamic impact resistance to satisfy complex service conditions,such as drops and impacts.This paper examined the impact resistance of SLCs fabricated by using microfluidic 3D printing.The results of dynamic split-Hopkinson pressure bar(SHPB)tests showed that the performance of the fabricated SLCs improved in terms of energy dissipation and impact resistance compared with pristine materials.In case of dynamic impact in the strain rates ranging from 100 to 400s−1,the SLC specimen deformed without fracture,and its energy dissipation was dominated by the viscosity of the liquid inclusions.For dynamic impact in the strain rates ranging from 500 to 800s−1,the SLC specimen fractured and its energy dissipation was determined by the volume fraction of the liquid inclusions.Thus,the energy dissipation of the SLCs could be tuned by regulating the viscosity and volume fraction of the liquid inclusions to satisfy the requirements of protection against different strain rates.Furthermore,the process of fracture of the SLCs under the dynamic SHPB tests was recorded and analyzed by using a high-speed camera.The results showed that distributed liquid inclusions changed the paths of crack propagation to enhance energy dissipation in the SLCs.This study experimentally verified the enhancement in the energy dissipation of SLCs,and provided design strategies for developing multifunctional SLCs with high impact resistance.

关键词： Solid-liquid composites(SLCs) Impact resistance Dynamic SHPB Energy dissipation fracturing process

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

An experimental investigation of the fracturing behaviour of rock-like materials containing two V-shaped parallelogram flaws

引用

International Journal of Mining Science and Technology 2020年第6期30卷 777-783页

作者： Jinjin Tian Dongjing Xu Tianhao Liu College of Earth Sciences&Engineering Shandong University of Science and TechnologyQingdao 266590China

The distribution characteristics and evolution law of rock mass fissures induced by mining are a key scientific issue in the study of deep rock mechanics.In this study,a series of uniaxial compression experiments was conducted on rock-like specimens containing double V-shaped prefabricated fissures at dip angles ofα=β=45°,α=45°fracturing process of the specimens were analysed in detail.Additionally,the crack initiation stress presented a nearly linear growth trend,which is generally similar to that of the crack peak stress with increasing flaw dip angle.By applying photographic monitoring to the crack initiation,propagation,coalescence,and failure modes in rock-like specimens,it was easily seen that the V-shaped flaw properties slightly influence the crack initiation positions but significantly influence the crack trajectories.The crack failure modes can be summarized into two distinct types.The study reported herein can provide a better understanding of the evolution of double V-shaped prefabricated fissures induced by coal mining.

关键词： V-shaped fissure fracturing process Overburden strata Coal mining

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：