检索结果-南通市图书馆

Influence of permeability anisotropy of seepage flow on the tunnel face stability

Underground Space 2023年第1期8卷 1-14页

作者： Qiguang Di Pengfei Li Mingju Zhang Jie Wu Key Laboratory of Urban Security and Disaster Engineering Ministry of EducationBeijing University of TechnologyBeijing 100124China

This paper focuses on the influence of permeability anisotropy of seepage flow on the face stability for a shied *** analytical model has been proposed to present the hydraulic head distribution around the tunnel face in the anisotropic ground,considering the difference of permeability coefficient in the horizontal direction and the vertical *** rationality of the proposed model is ver-ified by a series of numerical ***,an analytical model of face stability for a tunnel under the anisotropic seepage has been established based on the limit analysis upper bound *** of the analytical solutions and the numerical simulations are conducted,and the limit support pressure of the two methods is *** effect of permeability anisotropy and water pressure on the stability of the tunnel face is analyzed through the three-dimensional analytical *** of permeability has a significant impact on the stability of the tunnel face,and its impact gradually *** can also be found that the water pressure coefficient of the tunnel face has a significant effect on the limit support pressure and the failure area when the ratio of the horizontal permeability to the vertical permeability is large.

关键词： Seepage flow hydraulic head distribution Permeability anisotropy Shield tunnel Water pressure

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

Determination of groundwater flow regimes based on the spatial non-local distribution of hydraulic gradient:Model and validation

引用

Journal of Hydrodynamics 2022年第2期34卷 299-307页

作者： Xiu-xuan Wang Jia-zhong Qian Lei Ma Qian-kun Luo Guan-qun Zhou School of Resources and Environmental Engineering Hefei University of TechnologyHefei230009China

The groundwater flow in natural aquifers can change from the Darcy flow to the non-Darcian flow due to a variety of causes,such as the increase of the Reynolds number in the highly permeable media or the decrease of the hydraulic gradient below a threshold in the low-permeability media,while the representative flow regime cannot be reliably determined using the traditional *** address this challenge,this paper proposes a new term called the equivalent hydraulic gradient(EHG)by generalizing the differential form of the Darcy’s law using a spatial integral of the upstream hydraulic *** nonlocal spatial variation of the hydraulic head difference between upstream and downstream zones is assumed to be the potential cause of the transition of the groundwater flow *** assumption is analogous to the common assumption used for quantifying the anomalous pollutant transport in the geological *** of this idea show that the EHG concept could distinguish three main flow regimes,namely the Super-Darcy flow,the Darcy flow,and the Sub-Darcy flow,although the Super-Darcy flow regime is rarely observed in the laboratory column flow *** of this study therefore shed lights on the interpretation of the fundamental dynamics of the groundwater moving in various heterogeneous aquifers,and may lead to the rebuilding of the hydrodynamics of the surface water,the groundwater,and the soil.

关键词： hydraulic head distribution spatially non-local effect flow regime Forchheimer number Reynolds number

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

Three-dimensional theoretical analysis of seepage field in front of shield tunnel face

引用

Underground Space 2022年第4期7卷 528-542页

作者： Qiguang Di Pengfei Li Mingju Zhang Caixia Guo Fan Wang Jie Wu Key Laboratory of Urban Security and Disaster Engineering Ministry of EducationBeijing University of TechnologyBeijing 100124China

To evaluate hydraulic head distribution in front of a shield tunnel in a saturated soil layer,theoretical analysis and numerical simulations are carried out in this *** on the partial differential equilibrium equation of seepage flow,a three-dimensional(3D)theoretical analytical model of the shield tunnel face and the seepage field in front of it is established using the eigenfunction and the Fourier series expansion methods,and the hydraulic head calculation formula is *** with engineering cases,the theoretical analysis results and the 3D numerical simulation results are compared and *** effect of the water pressure of the tunnel face on the hydraulic head distribution is also *** results of the proposed analytical solution are in agreement with those of the numerical simulation solutions;moreover,the proposed analytical solution requires less time to calculate the seepage hydraulic head than the numerical *** ratio of the initial water table to the diameter(D)of tunnel face has a more significant impact on the hydraulic head distribution at a position 0.5D above the tunnel *** the water pressure on the tunnel face is not considered,the values of the hydraulic head are significantly underestimated.

关键词： Seepage flow hydraulic head distribution Shield tunnel Numerical simulation Water pressure

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

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：