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RISS 인기검색어
- 검색키워드
- 저자 : Rihong Cao (검색결과 2 건)
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Three-Dimensional Upper Bound Limit Analysis of Tunnel Stability with an Extended Collapse Mechanism
Zhizhen Liu,Ping Cao,Fei Wang,Jingjing Meng,Rihong Cao,Jingshuo Liu 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.12
A three-dimensional collapse mechanism that can consider a combined collapse of the tunnel roof and the side walls is proposed in this work. The three-dimensional upper bound support pressure is formulated with the power balance principal in the upper bound theorem. The nonlinear Mohr-Coulomb failure criterion is used to replace the commonly used linear Mohr-Coulomb failure criterion. The method has been validated by a series of examples, in which the three-dimensional collapse mechanism and support pressures are in a good agreementwith the numerical results and solutions found in the literatures. Furthermore, sensitivity analyses of the geotechnical and geometrical parameters on the support pressure areconducted and the collapsing range is measured. The results show that a higher value of nonlinear failure coefficient, tensile strength, initial cohesion and tangential internal friction angle can increase tunnel stability, while tunnel stability is threatened by a higher value of burial depth, unit weight, tunnel width and height. The predicted collapse range increases noticeably with the increase of the nonlinear coefficient. This study is of great significance for predicting the three-dimensional safety support pressure and collapse mechanism of tunnel.
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Modified Double-Reduction Method considering Strain Softening and Equivalent Influence Angle
Yifan Chen,Hang Lin,Yixian Wang,Rihong Cao,Chunyang Zhang,Yanlin Zhao 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.11
Slope stability has been the research focus in the field of geotechnical engineering. Both the asynchronous decay speeds and distinct stability contributions of cohesion c and friction ϕduring slope instability have been evidenced. In this study, based on linear softening model and weighted average hypothesis, a modified double-reduction method is established. The research includes: 1) the asynchronism between decay speeds of c and ϕ are described by adopting different slopes in linear softening model for c and tanϕ, in which case the respective reduction factors in strength reduction method Fc and Fϕ are solved. 2) The distinct slope stability contributions of c and ϕ is readily linked with the different influences to safety factor, and therefore, introducing the equivalent influence angle θe (defined as the slope angle at which c and ϕ share identical contributions to stability), as well as its determination method. 3) According to weighted average hypothesis that the overall safety factor FS is the weighted average of Fc and Fϕ, the contribution scaling factor μ (defined as the weighted ratio of Fc and Fϕ is proposed, which promotes the solution of respective weighted coefficients wc and wϕ of two reduction factors by combining θe, achieving a new double-reduction method. 4) The validity of this method is verified via comprehensive comparison with existing double-reduction methods of practical slope examples.
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