Meso-Mechanical Simulation of Fracture Grouting under Fluid-Solid Coupling Environment and Engineering Applications

2013 ◽  
Vol 477-478 ◽  
pp. 485-491 ◽  
Author(s):  
Feng Sun ◽  
Rong Pan ◽  
Xiu Yun Zhu ◽  
Tie Lin Chen
Keyword(s):  
Numerical Simulation ◽  
Soil Properties ◽  
Bearing Capacity ◽  
Field Test ◽  
Particle Flow ◽  
Particle Flow Code ◽  
Engineering Applications ◽  
Weathered Rock ◽  
Grouting Pressure ◽  
Fracture Grouting

Due to the complication of grouting process in soil, design of fracture grouting works is still mainly based on empirical considerations and experiences from past projects. Based on the theory of particle flow, the domain of flow is defined by using Fish language implemented in PFC and the formulas for flow and pressure are put forward respectively. Combined with above study, the process of fracture grouting in soil is simulated with particle flow code (PFC2D) from micro-viewpoint under coupling environment. In addition, the emergence and development of crack and grouting pressure in soil is analyzed under different grouting pressure and soil properties. The research results show that pressure plays a key role in consolidating the soil by fracture grouting, but in fact it should be kept in a reasonable value in order to forming grouting slurry net entirely. Filed test indicates that fracture grouting greatly increases the bearing capacity of weathered rock in Xiamen Xiangan subsea tunneling and the conclusions of numerical simulation agrees well with the field test and grouting theory.

scholarly journals Research on the Fracture Grouting Mechanism and PFC Numerical Simulation in Loess

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Zhenlong Zhang ◽  
Zhushan Shao ◽  
Xiaobo Fang ◽  
Xijun Liang
Keyword(s):  
Numerical Simulation ◽  
Diffusion Process ◽  
Model Test ◽  
Reference Value ◽  
Pressure Variation ◽  
Particle Flow ◽  
Fracture Grouting ◽  
Three Stages ◽  
And Diffusion

According to the model test of fracture grouting in loess, the grout changes with the pressure variation, which can be divided into three stages, foundation, expansion and fracturing, and diffusion, and ultimately splits into “Y” shaped grout fractures. Using PFC2D particle flow software simulates the slurry diffusion process on loess, and the results of the simulation display the same “Y” shaped slurry vein with the experiment, which has a certain reference value for fracture grouting in loess.

Numerical Simulation of Vibration Sieve Based on DEM

2012 ◽  
Vol 482-484 ◽  
pp. 1358-1361
Author(s):  
Yue Jing Zhao ◽  
Zhi Ying Qin
Keyword(s):  
Numerical Simulation ◽  
Discrete Element Method ◽  
Special Kind ◽  
Particle Flow ◽  
Particle Flow Code ◽  
Screening Process ◽  
Vibration Direction ◽  
Sieve Effect ◽  
Screening Efficiency ◽  
Particle Group

Vibrating sieve is a special kind of equipment which used to grading materials according to particle granularity. By the vibration acted on the sieve, the materials are loosed, are divided into layers, are transported and are permeated the sieve to screen the materials. Discrete Element Method (DEM) has been an effective numerical method to research the granule system motion. Using Particle Flow Code (PFC) based DEM, the screening process, the particle group motions on the screen, are simulated. How the amplitude, the frequency of vibration, the vibration direction angle, the decline degree of sieve effect screening efficiency are presented.

scholarly journals Numerical Simulation of Crack Propagation in Rock by Particle Flow Code

2008 ◽  
Vol 124 (10/11) ◽  
pp. 611-618 ◽  
Author(s):  
Takahiro FUNATSU ◽  
Qian LI ◽  
Norikazu SHIMIZU ◽  
Masahiro SETO ◽  
Kikuo MATSUI
Keyword(s):  
Numerical Simulation ◽  
Crack Propagation ◽  
Particle Flow ◽  
Particle Flow Code

scholarly journals Collapsed Shape of Shallow Unlined Tunnels Based on Functional Catastrophe Theory

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Chengping Zhang ◽  
Kaihang Han
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Catastrophe Theory ◽  
Particle Flow ◽  
Particle Flow Code ◽  
Direct Estimate ◽  
Basic Principles ◽  
Collapse Mechanisms ◽  
Functional Catastrophe Theory ◽  
Shape Curve

This paper investigates the collapse mechanisms and possible collapsing block shapes of shallow unlined tunnels under conditions of plane strain. The analysis is performed following the framework from a branch of catastrophe theory, functional catastrophe theory. First, the basic principles of functional catastrophe theory are introduced. Then, an analytical solution for the shape curve of the collapsing block of a shallow unlined tunnel is derived using functional catastrophe theory based on the nonlinear Hoek-Brown failure criterion. The effects of the rock mass parameters of the proposed method on the shape and weight of the collapsing block are examined. Moreover, a critical cover depth expression to classify deep and shallow tunnels is proposed. The analytical results are consistent with those obtained by numerical simulation using the particle flow code, demonstrating the validity of the proposed analytical method. The obtained formulas can be used to predict the height and width of the collapsing block of a shallow unlined tunnel and to provide a direct estimate of the overburden on the tunnel lining. The obtained formulas can be easily used by tunnel engineers and researchers due to their simplicity.

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