Geomechanics and Engineering

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Impact of MJS treatment and artificial freezing on ground temperature variation: A case study

  • Jiling, Zhao (College of Civil Engineering, Nanjing Forestry University) ;
  • Ping, Yang (College of Civil Engineering, Nanjing Forestry University) ;
  • Lin, Li (College of Civil Engineering, Nanjing Forestry University) ;
  • Junqing, Feng (East China Construction Co., Ltd of China) ;
  • Zipeng, Zhou (Nanjing Institute of Surveying, Mapping & Geotechnical Investigation, Co., Ltd. )
  • Received : 2022.10.14
  • Accepted : 2023.01.13
  • Published : 2023.02.10
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Abstract

To ensure the safety of underground infrastructures, ground can sometimes be first treated by cement slurry and then stabilized using artificial ground freezing (AGF) technique before excavation. The hydration heat produced by cement slurry increases the soil temperature before freezing and results in an extension of the active freezing time (AFT), especially when the Metro Jet System (MJS) treatment is adopted due to a high cement-soil ratio. In this paper, by taking advantage of an on-going project, a case study was performed to evaluate the influence of MJS and AGF on the ground temperature variation through on-site measurement and numerical simulation. Both on-site measurement and simulation results reveal that MJS resulted in a significant increase in the soil temperature after treatment. The ground temperature gradually decreases and then stabilized after completion of MJS. The initiation of AGF resulted in a quick decrease in ground temperature. The ground temperature then slowly decreased and stabilized at later freezing. A slight difference in ground temperature exists between the on-site measurements and simulation results due to limitations of numerical simulation. For the AGF system, numerical simulation is still strongly recommended because it is proven to be cost-effective for predicting the ground temperature variation with reasonable accuracy.

Keywords

Acknowledgement

The research work herein was supported by the National Natural Science Foundation of China (No.52178337), the China Scholarship Council Project (Grant N0.202108320283), and the National First-class Disciplines.

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