Study on Temperature Field Variation Law of MJS Reinforcement for Underpass Section of Overlapping Station

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Study on Temperature Field Variation Law of MJS Reinforcement for Underpass Section of Overlapping Station

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[1]DAI Yifei,YANG Ping,WANG Ning,et al.Study on Temperature Field Variation Law of MJS Reinforcement for Underpass Section of Overlapping Station[J].Journal of Zhengzhou University (Engineering Science),2023,44(01):103-110.[doi:10.13705/j.issn.1671-6833.2022.04.002]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 44卷 Number of periods: 2023 01 Page number: 103-110 Column: Public date: 2022-12-06

Title:: Study on Temperature Field Variation Law of MJS Reinforcement for Underpass Section of Overlapping Station

Author(s):: DAI Yifei¹; YANG Ping¹; WANG Ning²; LOU Yin²; FENG Junqing³; 1.School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China; 2.Nanjing Metro Group Construction Company, Nanjing 210008, China; 3.East China Branch of China Railway Third Bureau, Nanjing 210008, China)

Keywords:: water-rich strata; MJS reinforcement of underpass section; heat of hydration; temperature field; numerical simulation; cement soil; freezing

CLC:: TU528. 1

DOI:: 10.13705/j.issn.1671-6833.2022.04.002

Abstract:: When a new station crosses the existing station in the water-rich strata, MJS and freezing method will be used to reinforce it. The cement soil constructed by MJS construction method will produce a lot of hydration heat, which can increase the temperature of added solids, and the horizontal freezing effect. This paper is based on the background that some single-layer sections of the platform layer of the newly-built Metro Line 7 of Nanjing Metro need to pass through the upper existing station at a short distance,the variation law of MJS reinforced soil temperature is studied by numerical simulation, and the correctness of numerical simulation is verified by actual measurement. The results show that the maximum temperature of MJS pile reaches 80.07 ℃ within 3~8 days after completion of construction, and the more intensive MJS pile layout and the larger the reinforcement area, the higher the temperature generated in the solid center of pile group, and the slower the initial cooling rate under natural cooling condition. After the hydration heat release of MJS pile reaches the maximum temperature, the temperature decreases in the form of negative exponential power function, and the cooling rate is fast first and then slow. The influence range of MJS on the temperature of surrounding soil expands gradually with time, and the larger the reinforcement range is, the larger the influence range of surrounding soil temperature is, and the influence range can be up to 4.5 m beyond the boundary of MJS reinforced soil. The closer it is to the cement-soil reinforcement area, the higher soil temperature is. Combined with the existing MJS hydration heat release law, strength research and numerical simulation results, considering the temperature field distribution and temperature value of hydration heat at different times, it is suggested that the best opening time should be the 60th day after the completion of MJS reinforcement in similar projects in the future.

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Last Update: 2022-12-07