富水粉质黏土中地铁联络通道冻结法试验研究

doi:10.13722/j.cnki.jrme.2020.0545

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摘要基于现场试验，对富水粉质黏土地层条件中联络通道在冻结法施工中温度场变化及地表变形规律进行研究。结果表明：在冻结期间，各测温孔的温度下降趋势大致相同，但冻结壁向冻结管外侧发展的速率是向内侧发展的1.35倍；受开挖施工的影响，远离开挖边界的测温孔各测点温度比靠近开挖边界测点温度下降得快，且冻结主面土体受开挖升温的影响比冻结辅面大；冻结施工期间的地表竖向位移变化可分为小幅隆起、冻胀加快、冻融起伏、地表下沉和融沉注浆5个阶段；冻结初期，冻结管交圈后竖向位移抬升加快，联络通道开挖导致竖向位移起伏震荡，但整体呈抬升趋势，完全解冻需要3个月左右；开挖期间，最大冻胀量、最大沉降量曲线分别呈倒“V”型、“W”型，联络通道中轴线上方测点冻胀量较大，距离中轴线越远，冻胀量越小，联络通道上方沉降量较小；建议粉质黏土地层冻结施工交圈时间不少于40 d，冻结壁平均温度为－10 ℃。

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	郜新军
	李铭远
	张景伟
	宋建学

关键词 ：土力学, 联络通道, 人工冻结, 温度场, 冻胀融沉, 现场实测

Abstract：The temperature field and the surface deformation of a cross passage constructed in water rich silty clay layers using freezing method were studied based on field test. The results show that the temperature drop trend of each temperature measuring hole is approximately same，but the development rate from the freezing wall to the outside of the freezing pipe is 1.35 times larger than that to the inside during the freezing period. Due to excavation construction，the temperature of each measuring point far away from the excavation boundary decreases faster than that near the excavation boundary，and the influence of excavation on the temperature of soil mass at the freezing main surface is stronger than that at the freezing auxiliary surface. During freezing construction，the vertical displacement change of the ground surface could be divided into small uplift stage，accelerated frost heaving stage，freeze-thaw fluctuation stage，surface subsidence stage and thaw settlement grouting stage. In the early freezing stage，the vertical displacement increases quickly after the intersection of frozen pipes，the excavation of the connecting passage leads to the fluctuation of the vertical displacement which rises as a whole，and 3 months are needed for silty clay reaching the complete thaw state. During excavation，the maximum frost heaving curve and the maximum settlement curve show inverted“V”and“W”shapes respectively. The frost heaving and the settlement of the measuring points above the central axis of the connecting channel are respectively larger and smaller，and the farther away from the central axis，the smaller the frost heaving. It is proposed that the construction time of freezing construction in silty clay layer should not be less than 40 days and the average temperature of freezing wall should be －10 ℃.

Key words： soil mechanics')" href="#">

soil mechanics cross passage artificial freezing temperature field frost heave and thawing settlement ')" href="#">field measurement

引用本文:

郜新军，李铭远，张景伟，宋建学. 富水粉质黏土中地铁联络通道冻结法试验研究[J]. 岩石力学与工程学报, 2021, 40(6): 1267-1276.
GAO Xinjun，LI Mingyuan，ZHANG Jingwei，SONG Jianxue. Field research on artificial freezing of subway cross passages in water-rich silty clay layers. , 2021, 40(6): 1267-1276.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0545 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I6/1267

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