Deformation-Based Basal Heave Reliability Analysis and Selection on Monitoring Points for General Braced Excavations

Kaiqi Meng, Guangming Yu, Liang Li (), Zhen Xu, Jun Lei, Yanxiang Fan, Hongbiao Yu and Liang Xu
Additional contact information
Kaiqi Meng: School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
Guangming Yu: School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
Liang Li: School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
Zhen Xu: Qingdao Metro Line 1 Co., Ltd., Qingdao 266045, China
Jun Lei: Engineering Bureau Co., Ltd., China State Construction, Changsha 410007, China
Yanxiang Fan: The Fifth Engineering Co., Ltd., China Railway 25th Bureau Group, Qingdao 266101, China
Hongbiao Yu: Tunnel Engineering Co., Ltd., China Communications Construction, Beijing 100024, China
Liang Xu: School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China

Sustainability, 2023, vol. 15, issue 11, 1-19

Abstract: A framework for evaluating deformation-based basal heave stability is proposed in order to distinguish between the different responses under freely developed and prohibited basal heave failures. In the case of freely developed basal heave failure, the maximum deformation values occur at the center point of pit bottom, whereas this is not the case for the prohibited basal heave failure. The critical thickness of soft soil layer between the end of supporting structures and the top of hard stratum is about 0.3 B ( B = excavation width), beyond which the freely developed basal heave failure arises. In situations otherwise, the prohibited basal heave failure occurs. The failure probability of basal heave failure at the center point increases significantly as B ranges within a limited value; then, it begins to decrease or to vary slightly at a certain value under a given thickness of soft soil layer. If the thickness of soft soil layer is so sufficiently large that freely developed basal heave failure occurs for any of B, the failure probability of basal heave failure at the center point increases as B increases. The selection of the optimum monitoring points for basal heave stability is recommended to account for the weights in the contribution to the basal heave deformations of the influencing factors such as excavation width and thickness of soft soil layer. The proposed framework is applicable to basal heave reliability analysis for braced excavations where deformation values are focused.

Keywords: basal heave stability; basal heave deformation; monitoring points design; response surface method; Monte Carlo simulation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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