Home

Person

Jian Zhao

This person is no longer with EPFL

About
Privacy
Disclaimer

Graph Chatbot

Related publications (155)

Effect of Water Content on P-Wave Attenuation Across a Rock Fracture Filled with Granular Materials

Jian Zhao, Wei Wu

Springer Wien2015

EPB tunneling challenges in bouldery ground: a new experience on the Tabriz metro line 1, Iran

Jian Zhao

Underground construction of the Tabriz metro line 1 involved boring twin tunnels with two earth pressure balance machines in alluvial deposits. Although this type of machine is recommended for excavation in fine soils, its performance was evaluated in this ...

Springer Verlag2014

A Microstructure-Based Model to Characterize Micromechanical Parameters Controlling Compressive and Tensile Failure in Crystallized Rock

Jian Zhao, Tohid Kazerani

A discrete element model is proposed to examine rock strength and failure. The model is implemented by UDEC which is developed for this purpose. The material is represented as a collection of irregular-sized deformable particles interacting at their cohesi ...

Springer Verlag2014

A Review of Dynamic Experimental Techniques and Mechanical Behaviour of Rock Materials

Jian Zhao, Qianbing Zhang

The purpose of this review is to discuss the development and the state of the art in dynamic testing techniques and dynamic mechanical behaviour of rock materials. The review begins by briefly introducing the history of rock dynamics and explaining the sig ...

Springer Wien2014

A Dynamic-induced Direct-shear Model for Dynamic Triggering of Frictional Slip on Simulated Granular Gouges

Jian Zhao, Wei Wu

This study presents a dynamic-induced direct-shear model to investigate the dynamic triggering of frictional slip on simulated granular gouges. An incident P-wave is generated as a shear load and a normal stress is constantly applied on the gouge layer. Th ...

Springer Verlag2014

Quasi-static and dynamic fracture behaviour of rock materials: phenomena and mechanisms

Jian Zhao, Qianbing Zhang

An experimental investigation is conducted to study the quasi-static and dynamic fracture behaviour of sedimentary, igneous and metamorphic rocks. The notched semi-circular bending method has been employed to determine fracture parameters over a wide range ...

Springer Verlag2014

Role of filling materials in a P-wave interaction with a rock fracture

Jian Zhao, Wei Wu

The purpose of this study is to investigate the role of filling materials (e.g., quartz sand and kaolin clay) in the interaction between a P-wave and a rock fracture. The specific fracture stiffness reflects the seismic response of a filled fracture, while ...

Elsevier2014

Suggested Methods for Determining the Dynamic Strength Parameters and Mode-I Fracture Toughness of Rock Materials

Jian Zhao

The properties of rocks under dynamic loading are important for the study of a whole range of rock mechanics and rock engineering problems, including blasting, protective design, explosives storage, rock bursts and seismic events. The propagation of dynami ...

Springer International Publishing2014

A new model for TBM performance prediction in blocky rock conditions

Jian Zhao, Andrea Delisio

The term "blocky rock conditions" is generally associated with face instabilities in blocky/jointed rock masses. These events are generally promoted by unfavorable rock mass structural conditions, in terms of joint frequency and orientation, and acting str ...

Pergamon-Elsevier Science Ltd2014

Use of indentation tests to study the influence of confining stress on rock fragmentation by a TBM cutter

Jian Zhao, Hongsu Ma, Lijun Yin

This paper explores the influence of the confining stress on rock fragmentation under the cutter of tunnel boring machine (TBM) by indentation test. Acoustic emission (AE) system was employed for real-time monitoring the rock fragmentation process during t ...

Pergamon-Elsevier Science Ltd2014

The analysis of tunnel excavation in difficult ground conditions with the Decision Aids for Tunnelling (DAT)

Jean-Paul Dudt, Federica Sandrone, Jian Zhao, Erika Paltrinieri

2014

Study on rock mass boreability by TBM penetration test under different in situ stress conditions

Jian Zhao, Lijun Yin

Rock mass boreability is a comprehensive parameter reflecting the interaction between rock mass and a tunnel boring machine (TBM). Many factors including rock mass conditions, TBM specifications and operation parameters influence rock mass boreability. In ...

Pergamon-Elsevier Science Ltd2014

Seismic response of adjacent filled parallel rock fractures with dissimilar properties

Jian Zhao, Wei Wu

The purpose of this study is to analytically predict and to experimentally investigate the seismic response of adjacent filled parallel rock fractures with dissimilar properties (e.g., fracture thickness and stiffness). The time-domain recursive method is ...

Elsevier2013

Dynamic response of a rock fracture filled with viscoelastic materials

Jian Zhao, Jianbo Zhu, Wei Wu

Rock fractures filled with viscoelastic materials, such as sand, usually contribute to rock mass instability under the influence of seismic waves and dynamic loads. The purpose of this study is to verify that the specific fracture stiffness and the specifi ...

Elsevier2013

Rock mass assessment and corresponding TBM operation optimization for TBM tunneling at depth - a case study of Jinping II hydropower station

Jian Zhao, Lijun Yin

During TBM tunneling at the great depth, problems such as high in situ stress, groundwater inflow and fractured rock masses are main reasons of the geotechnical risk occurrence in TBM tunneling. Thus it is necessary to modify TBM and optimize TBM operation ...

Crc Press-Taylor & Francis Group2013

A further study on seismic response of a set of parallel rock fractures filled with viscoelastic materials

Jian Zhao, Jianbo Zhu, Wei Wu

The purpose of this study is to further investigate the seismic response of a set of parallel rock fractures filled with viscoelastic materials, following the work by Zhu et al. Dry quartz sands are used to represent the viscoelastic materials. The split H ...

Wiley-Blackwell2013

Particle manifold method (PMM): A new continuum-discontinuum numerical model for geomechanics

Jian Zhao, Gaofeng Zhao, Liang Sun

Particle manifold method (PMM) is a new extension of the numerical manifold method (NMM). PMM uses a mathematical cover system to describe the motion and deformation of a particle-based physical domain. By introducing the concept of particle into NMM, PMM ...

Wiley-Blackwell2013

Evaluation of EPB TBM performance in mixed ground conditions

Jian Zhao, Ákos Tóth

This paper investigates the performance of Earth Pressure Balance Tunnel Boring Machines (EPM TBMs) in rock-soil interface mixed-face ground based on the Deep Tunnel Sewerage System project in Singapore. Several methods are available to estimate TBM tunnel ...

Crc Press-Taylor & Francis Group2013

A Numerical Study on Wave Transmission Across Multiple Intersecting Joint Sets in Rock Masses with UDEC

Jian Zhao, Jianbo Zhu

This paper presents a numerical study on wave transmission across jointed rock masses with UDEC, where multiple intersecting joint sets exist. The capability of UDEC of studying wave transmission across rock joints is validated through comparison with anal ...

Springer Verlag2013

Obliquely incident wave propagation across rock joints with virtual wave source method

Jian Zhao, Jianbo Zhu

Due to the presence of joints, waves are greatly attenuated when propagating across rock masses. Zhu et al. (2011) (Normally incident wave propagation across a joint set with virtual wave source method. J. Appl. Geophys.73, 283-288.) studied normally incid ...

Elsevier2013

Page 4 of 8