Calculation Method of Additional Load of Metro Tunnel
Crossing underneath Existing Airstrip

doi:10.3973/j.issn.2096-4498.2020.09.007

Tunnel Construction ›› 2020, Vol. 40 ›› Issue (9): 1292-1299.DOI: 10.3973/j.issn.2096-4498.2020.09.007

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Calculation Method of Additional Load of Metro Tunnel Crossing underneath Existing Airstrip

TONG Jianjun^{1, 2}, GUI Dengbin^{1, 2}, WANG Li^{1, 2}, WANG Mingnian^{1, 2}, WANG Zhilong^{1, 2, *}

(1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)

Online:2020-09-20 Published:2020-10-10

Abstract

Abstract: In order to more accurately and conveniently calculate the additional load value of the most unfavorable action position of the tunnel undercrossing the airstrip during taxiing, the peak value of the most unfavorable sliding load of the 22 wheels of the aircraft is taken as the concentrated force of the static load of the aircraft. The additional stress value of the stratum under wheel load is analyzed, and the distribution and magnitude of the maximum additional stress under different depths are analyzed. According to the loadstructure method and the theoretical solution of the additional stress of the aircraft, the most unfavorable distribution mode of the additional load in the tunnel under the airstrip and metro is determined, and the simplified calculation formula of the additional load of the aircraft q1 and q2 are obtained through regression analysis. Finally, the applicability of the J. Boussinesq theoretical formula is verified by numerical simulation. The research results show that: (1) As the burial depth of the tunnel increase, the proportion of the maximum vertical additional stress of the aircraft to the surrounding rock pressure of the tunnel decreases rapidly first and then slowly; when the burial depth is greater than 50 m, the proportion of the maximum vertical additional stress of the aircraft is relatively small. (2) The positions of the maximum vertical additional stress value of the aircraft under different burial depths are basically the same, which are located on the central axis 2.1~3.3 m from the last row of wheels of the aircraft. (3) The most unfavorable distribution mode of the aircraft additional load is approximately symmetrical trapezoid distribution mode, and the point of the maximum vertical additional stress value of the aircraft is directly above the tunnel crown. (4) The simplified additional stress q1 is negatively related to the burial depth z of the tunnel, and q5 is negatively related to the burial depth z of the tunnel and the tunnel diameter D.

Key words: metro tunnel, aircraft sliding load, additional load, distribution pattern

CLC Number:

U 45

TONG Jianjun, GUI Dengbin, WANG Li, WANG Mingnian, WANG Zhilong. Calculation Method of Additional Load of Metro Tunnel Crossing underneath Existing Airstrip[J]. Tunnel Construction, 2020, 40(9): 1292-1299.

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Calculation Method of Additional Load of Metro Tunnel Crossing underneath Existing Airstrip

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