Grout Improvement Effect in Jointed Rock Slope by Numerical Modeling Method

 

Wenyuan Li

School of Urban and Rural Construction, Chengdu University, Chengdu 610106, China
e-mail: liwenyuancu2011@126.com

Qihong Wu*

School of Urban and Rural Construction, Chengdu University, Chengdu 610106, China
* Corresponding author
e-mail: wuqihong2009@126.com

 

 ABSTRACT

In the past, stress and deformation responses of cranny slope reinforced by compressive grouting are often obtained by laboratory or in-situ (field) tests, which cost much expense. Recently, however, rapid advances in computer technology and sustained development have pushed the numerical analysis like the method of fast Lagrangian analysis of continua three dimensions (FLAC3D) to the forefront of geotechnical practice, which explores a new way for geotechnical designing. In this paper, effect of grouting reinforcement to the stress and deformation of rock mass are analyzed, while grouting consists in injecting into the rock mass a cement grout mixture under controlled pressures and volumes, which can reduce the permeability and lead to the improvement in terms of mechanical properties of rock mass itself. When project expense is taken into consideration, the analytical solutions are obtained by theoretical analysis to find out the effective grouting areas. At last, FLAC3D is used to build the model of cranny slope with complicated geometry, then calculate the response of each grid so as to analyze the macroscopic effects of slope, which show that, after grouting, stress and displacement of rock mass become more symmetrical and continuous. Tensile stress areas reduce gradually. Grouting in cranny slope can improve its stability greatly.

Keywords: Numerical simulation, slope, stress, deformation, effect.

Get the entire paper (pdf)    Go back to the TOC