TY - JOUR

T1 - Risk assessment and optimization of supporting structure for a new recyclable pipe jacking shaft during excavation process

AU - Zhang, Chao

AU - Zhang, Yunhui

AU - Xia, Yangyang

AU - Fang, Hongyuan

AU - Zhao, Peng

AU - Wang, Cuixia

AU - Bin Li, Li

AU - Pan, Yanhui

AU - Zou, Zhihui

AU - Rabczuk, Timon

AU - Zhuang, Xiaoying

N1 - Funding Information: This research was supported by the National Key Research and Development Program of China (No. 2022YFC3801000 ), the National Natural Science Foundation of China (No. 52178368, 51978630, 51909242, 52009125 ), the Program for Science and Technology Innovation Talents in Universities of Henan Province (No. 23HASTIT007 ), the Science and Technology Innovation Team of Colleges and Universities in Henan Province ( 23IRTSTHN004 ), the First-class Project Special Funding of Yellow River Laboratory ( YRL22LT07 ), the China Postdoctoral Science Foundation (No. 2022TQ0305, 2020TQ0285 ), Henan Post-doctoral Foundation (No. 202001016 ), and Key Scientific Research Projects of Colleges and Universities in Henan Province (No. 21A570007 ), for which the authors are grateful acknowledged.

PY - 2023/4

Y1 - 2023/4

N2 - Pipe jacking shaft is an important part of pipe jacking construction, its support structure can support the soil around the pipe jacking shaft to prevent soil destabilization and collapse and ensure construction safety. Most of the existing support structures of pipe jacking shafts are made of cement materials, which have the advantages of high bearing capacity, good integrity and easy access to materials, but also have inherent disadvantages such as high construction cost, long construction period, difficulty in dismantling, and inability to reuse demolition waste, which are not conducive to the sustainable construction. Based on the concept of sustainable construction, this paper proposes a reusable support structure for pipe jacking shafts, which is made of H-shape steel, steel plate and water stop by welding or bolting assembly, easy to install and disassemble, and can be recycled and reused. In order to verify the bearing performance of the new support structure and evaluate the risk of destabilization during excavation, finite element numerical simulation and full-scale test were carried out, and gives the safety design parameters of new supporting structures by using orthogonal tests. The results show that the finite element numerical simulation results are basically consistent with the full-scale test results, further proving that the numerical simulation results can be used to guide the design and construction feasibility of the support structure during the excavation of the pipe jacking shaft. The construction machinery has a great effect on the safety and stability of the support structure during excavation, and the distance between the construction machinery and the pipe jacking shaft should be reasonably controlled to avoid the risk of structural instability. The results of the sensitivity analysis show that the steel type of the support structure and the spacing of the piles are the two most important factors, which play a key role in the safety and stability of the support structure and should be highly noted in the design and calculation process.

AB - Pipe jacking shaft is an important part of pipe jacking construction, its support structure can support the soil around the pipe jacking shaft to prevent soil destabilization and collapse and ensure construction safety. Most of the existing support structures of pipe jacking shafts are made of cement materials, which have the advantages of high bearing capacity, good integrity and easy access to materials, but also have inherent disadvantages such as high construction cost, long construction period, difficulty in dismantling, and inability to reuse demolition waste, which are not conducive to the sustainable construction. Based on the concept of sustainable construction, this paper proposes a reusable support structure for pipe jacking shafts, which is made of H-shape steel, steel plate and water stop by welding or bolting assembly, easy to install and disassemble, and can be recycled and reused. In order to verify the bearing performance of the new support structure and evaluate the risk of destabilization during excavation, finite element numerical simulation and full-scale test were carried out, and gives the safety design parameters of new supporting structures by using orthogonal tests. The results show that the finite element numerical simulation results are basically consistent with the full-scale test results, further proving that the numerical simulation results can be used to guide the design and construction feasibility of the support structure during the excavation of the pipe jacking shaft. The construction machinery has a great effect on the safety and stability of the support structure during excavation, and the distance between the construction machinery and the pipe jacking shaft should be reasonably controlled to avoid the risk of structural instability. The results of the sensitivity analysis show that the steel type of the support structure and the spacing of the piles are the two most important factors, which play a key role in the safety and stability of the support structure and should be highly noted in the design and calculation process.

KW - Design optimization

KW - Finite element simulation

KW - Full-scale test

KW - Recyclable supporting structure

KW - Risk assessment

UR - http://www.scopus.com/inward/record.url?scp=85148360829&partnerID=8YFLogxK

U2 - 10.1016/j.psep.2023.02.024

DO - 10.1016/j.psep.2023.02.024

M3 - Article

AN - SCOPUS:85148360829

VL - 172

SP - 211

EP - 224

JO - Process Safety and Environmental Protection

JF - Process Safety and Environmental Protection

SN - 0957-5820

ER -