Deformation Control Standards of High-speed Railway Tunnel in Loess by There-bench Method Based on Monitoring Data

doi:10.3973/j.issn.2096-4498.2020.01.007

Tunnel Construction ›› 2020, Vol. 40 ›› Issue (1): 50-57.DOI: 10.3973/j.issn.2096-4498.2020.01.007

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Deformation Control Standards of High-speed Railway Tunnel in Loess by There-bench Method Based on Monitoring Data

FENG Jimeng^{1, 2}, ZENG Sicong^{1, 2}, LIU Aiwu³, ZHAHG Shufa³, ZHANG Junru^{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; 3. China Tiesiju Civil Engineering Group Co., Ltd., Hefei 230022, Anhui, China)

Received:2019-05-16 Online:2020-01-20 Published:2020-04-04

Abstract

Abstract: The monitoring data of 47 crown deformation points in 6 tunnels on Baoji-Lanzhou Passenger-dedicated Line are used as research samples; and the samples are divided into 4 types, i.e. Q2 clayey loess, Q2 sandy loess, Q3 sandy loess and Q4 sandy loess, according to the formation age and composition. The displacement regression curves are obtained. The data show that: (1) The influence of water content in a certain range on the final subsidence value is little, while those of the bearing capacity of foundation and the buried depth are great. (2) By analyzing the predicted final settlement of the 4 types of loess, the deformation control standards are 110 mm for Q2 clayey loess, 170 mm for Q2 sandy loess, and 300 mm for Q3 and Q4 sandy loess, which is modified according to buried depth and bearing capacity of foundation; and the final standards are verified in Yinchuan-Xi′an Railway tunnels.

Key words: loess tunnel, crown settlement, deformation control standards, bearing capacity of foundation, buried depth

CLC Number:

U 45

FENG Jimeng, ZENG Sicong, LIU Aiwu, ZHAHG Shufa, ZHANG Junru. Deformation Control Standards of High-speed Railway Tunnel in Loess by There-bench Method Based on Monitoring Data [J]. Tunnel Construction, 2020, 40(1): 50-57.

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Deformation Control Standards of High-speed Railway Tunnel in Loess by There-bench Method Based on Monitoring Data

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