TY - JOUR
T1 - Analysis of the influence of vehicle loads on deep underground excavation-supporting structures
AU - Tang, Liyun
AU - Qiu, Peiyong
AU - Schlinger, Charles Martin
AU - Yang, Gengshe
AU - Ye, Wanjun
N1 - Funding Information:
This research was supported by the National Natural Science Foundation of China (No. 41502298), the Key Plan for Innovative Science and Technology Groups of Shanxi Province of China (No. 2014KCT-30) and the Overall Innovation Projects of Science and Technology of Shanxi Province of China (No. 2011KTZ03-02-01).
Publisher Copyright:
© Shiraz University 2016.
PY - 2016/9
Y1 - 2016/9
N2 - The conventional equivalent thickness of soil layer method is usually utilized to simplify vehicle loads in the design of underground excavation-supporting structure, but this method does not take into account the change of rupture angle caused by vehicle loads. The change of rupture angle induces the change of the thickness of the equivalent soil layer, and the design parameters will eventually become deficient. Aiming at this problem, an improved method is presented to better solve it. Following Coulomb's earth pressure theory, the deadweight of the active wedge is calculated. Combined with the active wedge equilibrium relation, a convergence value of the rupture angle is calculated by iteration on an equation developed with differential calculus. Then, the total vehicle loads that consist of the static and dynamic vehicle loads are represented by an equivalent soil layer with a specific thickness. Based on an urban underground light-rail station, the thickness of equivalent soil layer calculated by the improved method is 0.94 m, and by the conventional method, it is 0.66 m. The influences of the vehicle loads on the underground structure as determined by a conventional method versus using the improved method are developed by numerical simulation, and some curves of lateral displacements for excavation are obtained. The results reveal that the equivalent thickness increases about 42 % after considering the change of the rupture angle. The improved method can effectively improve the design accuracy by considering the change of soil rupture angle when dealing with vehicle loads in the design of underground excavation- supporting structure.
AB - The conventional equivalent thickness of soil layer method is usually utilized to simplify vehicle loads in the design of underground excavation-supporting structure, but this method does not take into account the change of rupture angle caused by vehicle loads. The change of rupture angle induces the change of the thickness of the equivalent soil layer, and the design parameters will eventually become deficient. Aiming at this problem, an improved method is presented to better solve it. Following Coulomb's earth pressure theory, the deadweight of the active wedge is calculated. Combined with the active wedge equilibrium relation, a convergence value of the rupture angle is calculated by iteration on an equation developed with differential calculus. Then, the total vehicle loads that consist of the static and dynamic vehicle loads are represented by an equivalent soil layer with a specific thickness. Based on an urban underground light-rail station, the thickness of equivalent soil layer calculated by the improved method is 0.94 m, and by the conventional method, it is 0.66 m. The influences of the vehicle loads on the underground structure as determined by a conventional method versus using the improved method are developed by numerical simulation, and some curves of lateral displacements for excavation are obtained. The results reveal that the equivalent thickness increases about 42 % after considering the change of the rupture angle. The improved method can effectively improve the design accuracy by considering the change of soil rupture angle when dealing with vehicle loads in the design of underground excavation- supporting structure.
KW - Excavation-supporting structure
KW - Stability
KW - The improved equivalent soil layer method
KW - Underground structure
KW - Vehicle loads
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U2 - 10.1007/s40996-016-0017-0
DO - 10.1007/s40996-016-0017-0
M3 - Article
AN - SCOPUS:85000623641
SN - 2228-6160
VL - 40
SP - 209
EP - 218
JO - Iranian Journal of Science and Technology - Transactions of Civil Engineering
JF - Iranian Journal of Science and Technology - Transactions of Civil Engineering
IS - 3
ER -