Study on coupled 3D seepage and stress fields of the complex channel project

Zhong, Denghua; Zhang, XiaoXin; Ao, Xuefei; Wang, Xiaoling; Tong, Dawei; Ren, Bingyu

doi:10.1007/s11431-013-5284-4

Cited by 14 publications

(3 citation statements)

References 14 publications

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“…Jia studied the long-term hydromechanical coupled behaviour of Belgium Boom clay to explain the effect of seepage on deformation [27]. Zhong et al used a 3D simulation technique, the volume of fluid (VOF) method, and the Navier-Stokes (N-S) equations to investigate the seepage of clay coupled with cyclic stress [28].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Deformation Characteristics of Tianjin Clays under Coupled Dynamic Stress and Seepage Fields

Lei

Feng

Jia

et al. 2019

Advances in Civil Engineering

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The causes, prevention, and control of clay disasters are of great concern in practical engineering applications. Recently, due to unprecedented economic development, increasing numbers of tunnels and subgrades of tidal flat areas have been built in Tianjin, China. Soft soil ground not only bears the vibration load during operation and construction but also receives seepage effects caused by the bursting of pipelines and variations in groundwater levels. Under the coupling action of dynamic and seepage loads, large settlement can occur in soft soil since the deformation is related to both cyclic stress and seepage. Therefore, it is significant to understand the dynamic deformation characteristics of soil to ensure the safety of engineering applications. In this study, a series of laboratory cyclic triaxial tests were conducted to study the deformation behaviours of Tianjin clays under coupled cyclic stress and seepage fields. To simulate the seepage field, water pressure is applied at the bottom of the specimen, and the water can be drained from the top of the specimen to form a head difference in the specimen during the tests. The effects of the seepage pressure, cyclic stress ratio (CSR), and a number of cycles (N) on the hydraulic conductivity, axial deformation, hysteresis curve and dynamic modulus of Tianjin clays were systematically investigated. The laboratory results show that the hydraulic conductivity (k) decreases with the increasing seepage pressure, CSR, and N, and its range is from 4.6 × 10−8 cm/s to 7.4 × 10−8 cm/s. The axial deformation of the soil increases with increasing CSR and seepage pressure. With an applied water pressure of 150 kPa at the bottom of the specimen and a CSR of 0.3, the maximum cumulative plastic strain reaches 4.78%, increasing by 53.2% compared with a CSR of 0.1. The hysteresis curve gradually becomes denser or thinner with increasing CSR and N; the hysteretic curve tends to a straight line for N of 5,000. The dynamic modulus increases with increasing N and depends on the CSR and seepage pressure. Empirical equations are suggested for calculating the dynamic modulus with different CSR values and seepage pressures. The results of this study can provide reference parameters for the construction and design of tunnels and subgrades of tidal flat areas in clay strata under the influence of water environments.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Deformation Characteristics of Tianjin Clays under Coupled Dynamic Stress and Seepage Fields

Lei

Feng

Jia

et al. 2019

Advances in Civil Engineering

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“…The quantification parameters considered in this article include fractal dimension, genus number, and order of continuity, which respectively reveal the hidden information of geological data in the new dimension of complexity including inhomogeneous geometries, arbitrary connectivity and discontinuous topologies. The parametric geomodeling methodology constructs a connection between the measures of structural complexity and the elements of the T‐spline surfaces delimiting rock volumes, and this framework is beneficial to stochastic geomodeling, dynamic model updating, and the application of statistical approaches, numerical methods and nature inspired computing algorithms in geospatial analysis (Ao et al., ; Lindsay et al., ; Siddique and Adeli, , , b, ; Wellmann et al., ; Zhong et al., ).…”

Section: Introductionmentioning

confidence: 99%

3D Parametric Modeling of Complex Geological Structures for Geotechnical Engineering of Dam Foundation Based on T‐Splines

Zhang

Zhong

et al. 2018

Computer aided Civil Eng

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We propose a novel geological modeling method based on T‐splines for computer‐aided design (CAD) and building information modeling (BIM) systems of geotechnical engineering and perform original research on special T‐splines modeling strategies and the algorithm aiming at depicting structural complexity to develop and introduce the T‐splines technology into engineering geological modeling. A methodology of parametric geological modeling with T‐splines is established, where a topology‐geometry modeling strategy is adopted, the inhomogeneity, arbitrary connectivity and discontinuity of geological structures are quantified and associated with T‐spline surface elements in the topology phase. A representative parametric algorithm called IBALR is presented in the context of dam foundation geological modeling to generate an inhomogeneous local refined T‐mesh with high genus topology which can fit a complex geological layer. The proposed method is flexible and effective in improving geological representation within geotechnical engineering.

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“…To further understand this process, many geologists have performed detailed research on models of geological geometric features [9,10]; these models can be divided into several types: wire-frame models, surface models, voxel models, constructive solid geometry (CSG) models, boundary representation (B-rep) models, and hybrid models. Triangular irregular networks (TIN) [11], Tetrahedral network (TEN) [12], B-rep [13], and Generalized tri-prism (GTP) [14] models are commonly used for the fast and accurate geometrical construction [15] of specialized geological phenomena, although difficulties still exist in building spatial relationships between geometric objects. These models mainly focus on the geometry modelling of geological phenomena [16], and a few of them consider the relationships of geological phenomena in strata, but it cannot fully describe the geological relationships [17] between folds, faults, and strata, and it lacks corresponding description of geological semantics [18,19] for geometric elements in the modelling process.…”

Section: Introductionmentioning

confidence: 99%

GIS Application to Regional Geological Structure Relationship Modelling Considering Semantics

2018

IJGI

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GIS modelling, which is often employed to establish the abstract structural forms of geological phenomena and their structural relationships, is of great importance for the expression and analysis of geological structures to describe and express such phenomena accurately and intuitively. However, current GIS modelling schemes value structural forms over structural relationships, and existing geological semantic expressions in the modelling of geological relationships are incomplete. Therefore, this paper categorizes geological relationships into three levels: geological phenomena, geological objects and geological spatial objects: (1) based on their definitions, this work categorizes geological relationships into internal composition relationships and external combined relationships for a total of two categories, eight classes and 27 small groups; (2) this work also improves the system with a total of 33 classified geological objects by transforming the relationships between geological phenomena into relationships between geological objects; and (3) based on the 27 small groups of geological relationships, through the corresponding geometric and semantic expressions between topological rules and geological rules and between relationship rules and geological rules, this work then expresses internal composition relationships as topological relationships between geological spatial objects and expresses external combined relationships as association relationships between geological spatial objects. A GIS model of geological relationships that integrates their geometries and semantics is then built. Finally, taking the Dagang-Danyang section of the Ningzhen mountains as an example, the results show that the proposed GIS modelling method can better store and express geological phenomena, geological objects and geological spatial objects in a way that integrates geometry and semantics.

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Study on coupled 3D seepage and stress fields of the complex channel project

Cited by 14 publications

References 14 publications

Experimental Investigation of the Deformation Characteristics of Tianjin Clays under Coupled Dynamic Stress and Seepage Fields

Experimental Investigation of the Deformation Characteristics of Tianjin Clays under Coupled Dynamic Stress and Seepage Fields

3D Parametric Modeling of Complex Geological Structures for Geotechnical Engineering of Dam Foundation Based on T‐Splines

GIS Application to Regional Geological Structure Relationship Modelling Considering Semantics

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