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 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.

References:: [1] RUSSO G， CORBO A， CAVUOTO F， et al. 人工地面冻结在沙质土壤中挖掘隧道。测量和回溯分析 [ J ] .隧道掘进与地下空间技术，2015,50：226-238.
[2] 杨平,陈瑾,张尚贵,等. 软弱地层联络通道冻结法施工温度及位移场全程实测研究 [ J] .岩土工程学报, 2017,39(12) :2226-2234.杨萍，陈杰，张志强，等.AGF对软土中横通道温度和位移场的全范围监测[J] .岩土工程学报， 2017， 39（12）： 2226-2234.
[3] 朱小龙,向克勤.MJS 工法桩在虹桥地下空间联络通道建设中的应用[J].施工技术，2014,43（增刊 2）：82-83.MJS方法在虹桥地下空间连接通道建设中的应用[J ] .施工技术， 2014， 43 （ S2）： 82-83.
[4] TOUNSI H，ROUABHI A，TIJANI M，等。人工地面冻结的热流体力学建模：在采矿工程中的应用[ J] .岩石力学与岩石工程，2019,52（10）：3889-3907.
[5] LAKE C B，YOUSIF M A M，JAMSHIDI R J. 冻融对轻胶结土性能和形态的影响[ J] .寒区科技，2017,134：33-44.
[6] 孙志强，张建明，党玉玲，等.高性能水泥处理的暖富冰冻土微观结构及强度特征[J] .山地科学，2019,16（6）：1470-1482.
[7] 张雅琴,杨平,江汪洋,等. 含水率及应变速率对冻结粉质黏土强度特性影响[ J] .郑州大学学报( 工学版) , 2020,41(3) :79-84.张玉琪，杨萍，江伟勇， et al.含水率和应变速率对冻冻粉质黏土强度特性的影响[J] .郑州大学学报（工学版）， 2020， 41（3）： 79-84.
[8] 庄惠敏, 杨平, 何文龙.人工冻融软弱土融沉特性研究 [J].郑州大学学报(工学版), 2016, 37(2): 62-66.软冻土解冻沉降行为研究[J] .郑州大学学报（工学版）， 2016， 37 （ 2 ）： 62-66.
[9] 邓友生，孟丽青，蔡梦真，等. 水泥土搅拌桩加固黄土路基稳定性研究 [ J] .郑州大学学报（工学版）， 2022， 43（3）： 59-66.邓 Y S，孟 L Q，蔡明 Z，等.水泥-土壤搅拌桩加固黄土路基稳定性研究[J] .郑州大学学报（工学版）， 2022， 43（3）： 59-66.
[10] 杨平，刘欣，佘才高，等.富水地层地下隧道下穿敏感管线对接既有结构 MJS + 人工冻结联合加固方法： CN111593726A[ P] .2020-08-28.杨萍，刘旭，佘志强，等. 富水层地下隧道现有结构通过敏感管道对接接缝的MJS+人工冻结组合加固方法： CN111593726A [ P ] .2020 - 08-28.
[11] 江国龙,陈四利,王军祥,等. 循环荷载作用下水泥土力学特性试验研究[ J] .地下空间与工程学报,2017, 13(增刊 2) :524-528.江 G L，陈 SL，王建 X，等.循环荷载作用下水泥土力学性能试验研究[J] .地下空间与工程学报， 2017， 13（增刊）： 524-528.
[12] 宋新江，徐海波，周文渊，等. 水泥土应力-应变特性真三轴试验研究 [ J ] .岩土力学， 2016， 37 （ 9 ）： 2489-2495.宋 X J，徐华 B，周 W Y，等.水泥土应力-应变特性的真三轴试验[J ] .岩土力学， 2016， 37（9）： 2489-2495.
[13] 宋新江，徐海波，王永雷等. 水泥土各向异性变形特性研究[ J] .岩土力学，2012,33（6）：1619-1624,1666.SONG X J， XU H B， WANG Y L，等.水泥-土各向异性变形特征研究[J ] .岩土力学， 2012， 33 （ 6 ）： 1619 - 1624， 1666.
[14] 黄广龙,龚晓南,肖溟.土性参数的随机场模型及桩体沉降变异特性分析 [ J ] .岩土力学, 2000, 21 ( 4 ) : 311-315.黄玉玲，龚旭新，肖明.土性随机田模型及桩沉降变异性分析[J] .岩土力学， 2000， 21（4）： 311- 315.
[15] 赵建玲，杨炳，李玲.基于数值分析的地铁喷射系统水合热对人工地面冻结的影响[ J] .土木工程学报，2021,25（2）：724-734.
[16] 郝明强，张帆，李永迪，等.MJS 工法与冻结法结合加固区温度场研究[ J] .建筑科技，2018,2（6）：80-84,93.HAO M Q， ZHANG F， LI Y D，等.MJS与冷冻法在温度场改善中的交叉应用[J] .建筑技术， 2018， 2（6）： 80-84， 93.
[17] 杨平，陈驰，张存，等.MJS 加固水泥土热物理特性研究 110 郑州大学学报（工学版） 2023 年 [ J] .沈阳建筑大学学报（自然科学版），2020,36（ 4）： 661-669.杨萍，陈 C，张 C，等.MJS水泥土热物理性质研究[J ] .沈阳建竹大学学报（理学版）， 2020， 36 （4）： 661-669.

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Last Update: 2022-12-07