New formulation and validation of the three-dimensional extension of a static relaxation method

Jiao, Yu Yong; Zhao, Jun; Ge, Xiurun

doi:10.1016/j.advengsoft.2004.04.004

Cited by 24 publications

(18 citation statements)

References 10 publications

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“…As discussed in Chapter 3, the current numerical efforts mainly concentrate on the modeling of indentation in continua, and modelling of fragmentation in discontinua is limited. The DEM, which was originally developed for quasi-static problems (Cundall, 1971;Jiao et al, 2004), has been applied in rock dynamics recently (Chen and Zhao, 1998;Fan et al, 2004). In this section, the effects of joint spacing on indentation of rock mass are highlighted and modeled by using the 2D DEM code UDEC (Universal Distinct Element Code) (Itasca, 1996), and the obtained numerical results are compared with those from the field observations.…”

Section: Overviewmentioning

confidence: 99%

Development of a rock mass characteristics model for TBM penetration rate prediction

Gong

Zhao

2009

International Journal of Rock Mechanics and Mining Sciences

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259

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With the advances of technology, TBMs are becoming more versatile and TBM tunneling has become a common tunneling method. During project planning, the prediction of TBM performance is a key factor for selection of tunneling methods and preparation of project schedules. During the construction, TBM performance need to be evaluated based on the encountered rock mass conditions and the machine parameters. A suitable prediction and evaluation model is required by the developer, contractors and TBM manufacturers. The objectives of this research are to study rock mass fragmentation mechanism induced by TBM cutters, and to develop a TBM penetration rate prediction model based on in situ measurements and laboratory tests.The rock breakage process under TBM rolling cutters can be divided into two stages. The first stage is the rock indentation, followed by the chip formation between two cuts. The process was simulated by using Universal Distinct Element Code (UDEC). The simulation results showed that rock indentation process consists of three stages: formation of a crushed zone, formation of minor crack zone and major cracks propagation. The crack initiation and propagation mainly grows along the frontier of the tensile failure zones. When the side cracks initiated from the crushed zone of two neighboring cutters propagate towards each other and coalesce, a chip is formed. The chip formation is greatly dependent on the cutter spacing and the critical cutter load.The optimal cutter spacing was also analyzed, taking the Bukit Timah granite as an example.The main rock mass properties, which influence rock mass breakage process and hence the penetration rate, include rock compressive strength, rock brittleness index, joint spacing and joint orientation. The effect of these rock mass parameters on the rock mass breakage process was analyzed by using UDEC modeling. These parameters ix

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Section: Overviewmentioning

confidence: 99%

Development of a rock mass characteristics model for TBM penetration rate prediction

Gong

Zhao

2009

International Journal of Rock Mechanics and Mining Sciences

Self Cite

259

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“…Jiao et al [7] employed the three-dimensional DEM code 3DEC to study joint effect on shock wave attenuation and found the filtering effect of rock joints. Though DEM can include a number of joint sets in a computational model, its finite difference procedure and one-by-one relaxation sequence have created many solution problems [8,9]. Against this background, Shi [10] proposed a discontinuum-based method, namely discontinuous deformation analysis (DDA), to simulate the discontinuous deformation behavior of jointed rock mass.…”

Section: Introductionmentioning

confidence: 99%

Viscous boundary of DDA for modeling stress wave propagation in jointed rock

Jiao

Zhang

Zhao

et al. 2007

International Journal of Rock Mechanics and Mining Sciences

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103

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“…The theory and application in this area are still in the developing stages. Several methods to assess the stability of slopes during earthquakes have been developed, including pseudo-static analysis, stressdeformation analysis, the Newmark sliding-block model, finite element analysis, and distinct element analysis (Chakraborti et al 2012;Jiao et al 2004;Jiao et al 2012;Pirasteh et al 2013;Sarkar et al 2012;Tang 1997;Zhang et al 2013). However, there have been few advances in the safety analysis of landslide under seismic loading, and the limited available literature is concentrated mainly on the qualitative characterization, probability analysis, vibration monitoring for the deformation failure of landslides, and simple transplantation of the numerical tools (Del Gaudio and Wasowski 2011;Jiao et al 2005;Jiao et al 2007;Jibson 2011).…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation on the stability of slopes threatened by earthquakes

Jiao

Tian

et al. 2014

Arab J Geosci

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This paper presents a methodology for evaluating the safety of slopes threatened by strong earthquakes. Based on the theory of modal analysis, the proposed approach analyzes the seismic landslide spectrum, including the calculation of the landslide intrinsic frequency and the investigation of the resonance effect. The concept and the solution of the resonance index (RI) of the seismic landslide are also proposed. By using the VC++ computer language, corresponding dynamic finite element program, namely Analysis of Seismic Landslide Spectrum (ASLS), is developed. To verify the proposed method, three examples are presented: a fixed-end beam, a specially designed landslide vibration experiment, and the largest landslide triggered by the 2008 Wenchuan earthquake. The obtained numerical and experimental results show that the proposed method can effectively evaluate the safety of seismic landslides. It is suggested that the resonance phenomenon of landslides should be considered in the landslide treatment and the seismic design.

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New formulation and validation of the three-dimensional extension of a static relaxation method

Cited by 24 publications

References 10 publications

Development of a rock mass characteristics model for TBM penetration rate prediction

Development of a rock mass characteristics model for TBM penetration rate prediction

Viscous boundary of DDA for modeling stress wave propagation in jointed rock

Numerical and experimental investigation on the stability of slopes threatened by earthquakes

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