ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Variability in the physical properties of rock mass is a major source of uncertaintyencountered in railway tunnel stability analysis. The conventional safety factor method on stabilityassessment of railway tunnel within soft and weak rock mass can not represent the variability ofrock mass. A formulation to compute the reliability of soft and weak rock mass, in which physicalnon-linearity is taken into account, is proposed. To consider the intermediate principal stress effecton the rock mass strength, the unified elasto-plastic strength criterion is proposed in the nonlinearfinite element analysis. The unified rock mass elasto-plastic material model is implemented inABAQUS user interface. The reliability analysis is performed in two steps. Firstly, the failureresponse is obtained by fitting the limit state function of the rock mass using the quadraticpolynomial based on the nonlinear finite element analysis of the rock mass. Secondly, the JCmethod is proposed to obtain the design point and the reliability index of rock mass. As a case forstudy, the reliability analysis of Jinhuashan railway tunnel within soft and weak rock mass isstudied using the proposed method. The two dimensional analysis is performed to consider theexcavation stage effect and the unloading effect on the rock mass. Computation result shows thatthe rock mass is in stability
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2521.pdf
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