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Ashtab, M and Ryoo, B Y (2022) Predicting Construction Workforce Demand Using a Combination of Feature Selection and Multivariate Deep-Learning Seq2seq Models. Journal of Construction Engineering and Management, 148(12).

Damdelen, O and Tansu, A (2022) Influence of Recycled Plastic on the Thermal Transmittance and Sustainable Assessment of Concrete Mixes. Journal of Construction Engineering and Management, 148(12).

Kazar, G, Doğan, N B, Ayhan, B U and Tokdemir, O B (2022) Quality Failures–Based Critical Cost Impact Factors: Logistic Regression Analysis. Journal of Construction Engineering and Management, 148(12).

Khurana, M, Garvin, M J and Mahalingam, A (2022) Synthesis of Relational Practices for PPP Contracts and Their Linkage with Governance Mechanisms. Journal of Construction Engineering and Management, 148(12).

Li, S and Xu, Z (2022) System Configuration Design of BIM Object-Oriented Database for Civil Engineering. Journal of Construction Engineering and Management, 148(12).

Lin, S and Cheung, S O (2022) Exploring the Concept of Psychological Distance and Its Impact on Intention to Settle in Construction Dispute Negotiation. Journal of Construction Engineering and Management, 148(12).

Naumets, S, Lu, M and Ali, M (2022) Project Schedule Development under Environment-Induced Time-Window Constraints: Case of Constructing River-Crossing Bridge in Remote Northern Region. Journal of Construction Engineering and Management, 148(12).

Pirzadeh, P, Lingard, H and Zhang, R P (2022) Job Quality and Construction Workers’ Mental Health: Life Course Perspective. Journal of Construction Engineering and Management, 148(12).

Salazar, L A, Ballard, G, Arroyo, P and Alarcón, L F (2022) Development of a Commitment Management System for Construction Projects. Journal of Construction Engineering and Management, 148(12).

Shafique, F and Mollaoglu, S (2022) Shared Transformational Leadership for Green Architecture Engineering and Construction Project Teams: A Study of LEED Projects. Journal of Construction Engineering and Management, 148(12).

Shen, Y, Lin, Z and Wang, Z (2022) Single-Side Accumulative Jacking Construction Method for Large-Span Arched Latticed Shells. Journal of Construction Engineering and Management, 148(12).

Tommelein, I D (2022) Work Density Method for Takt Planning of Construction Processes with Nonrepetitive Work. Journal of Construction Engineering and Management, 148(12).

Wang, J, Han, J, Chen, J, Ding, G, Feng, G, Liu, T and Guo, B (2022) Experimental and Numerical Study on the Dynamic Response of a Superthick Backfill Subgrade under High-Speed Railway Loading: A Case Study of Qianjiang–Zhangjiajie–Changde Railway. Journal of Construction Engineering and Management, 148(12).

• Type: Journal Article
• Keywords: Superthick backfill subgrade; Scaled model test; Numerical simulation; Vibration response;
• ISBN/ISSN: 0733-9364
• URL: https://doi.org/10.1061/(ASCE)CO.1943-7862.0002407
• Abstract:
  In this study, a mountain tunnel of the Qianjiang–Zhangjiajie–Changde Railway, which passes through a giant karst cave at a high position, was investigated as a case study. The cave cavity height below the tunnel track is approximately 30–55 m, and the collapse accumulation thickness at the cave bottom is approximately 37–66 m. After solution comparison analysis, a superthick backfill subgrade solution was selected by filling the karst cave with a cave ballast backfill + upper grouting. In connection with railway operation, large vibrations and dynamic settlements may occur under train loads, and the safety of train operations can be compromised. To investigate the vibration response of a superthick backfill subgrade in a giant karst cave, 12 dynamically scaled model tests with a scale ratio of 1∶5 were performed with a high-speed railway subgrade dynamic test platform. The subgrade slab thickness and running speed of the train were investigated as the variable parameters. The working state of each part of the subgrade was studied while the train passed, and the time-history variation and long-term development trend of the dynamic properties were analyzed. The attenuation behaviors of vibration displacement, dynamic stress, and acceleration in the superthick backfill subgrade were analyzed using the three-dimensional finite element method. The results showed that as the thickness of the subgrade slab increased, the dynamic response of the train decreased rapidly. At a running speed of 200  km/h, the average acceleration decreased by 75.2% at the bottom of the subgrade slab when the thickness of the slab decreased from 60 to 20 cm at the initial passage. Under a long-term load, acceleration at the same depth below the subgrade slab of thickness 60 cm decreased by 69.5% compared to that of thickness 20 cm. The superthick backfill subgrade with a 3-m-thick RC subgrade slab avoided evident dynamic settlement induced by the running load. When the tunnel was opened to traffic, tunnel structure settlement was monitored. Furthermore, the settlement of the tunnel invert was <1  mm within 1 year, which was consistent with the test results. The results proved that the design parameters and solution selection were reasonable and reliable and could serve as a reference for the development of similar projects and researches. The key contribution of this research is to propose an effective and low-budget treatment for the construction of railways that pass through giant caves. In addition, the findings from the study on superthick backfill subgrades provide industry practitioners with a comprehensive guide regarding the specific applications and mechanical performance of superthick backfill subgrades, which can serve as a stepping stone to facilitate the development of construction technology in the transportation industry.

Zou, Y, Wu, Y, Guo, B H W, Papadonikolaki, E, Dimyadi, J and Hung, S N (2022) Investigating the New Zealand Off-Site Manufacturing Industry’s Readiness for Automated Compliance Checking. Journal of Construction Engineering and Management, 148(12).