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以呼吉尔特矿区葫芦素副立井为工程实例,对国内首个基岩冻结新型单层井壁现浇混凝土温度场开展了现场实测研究,对新型单层井壁的防冻害、防裂技术进行了讨论。研究结果表明:在取消泡沫塑料保温层、现浇混凝土与冻结基岩直接接触的条件下,通过适当增加冻结管至井帮距离、提高井帮温度的方法,可保证新型单层井壁在强度增长期免受冻害,葫芦素副立井实测的全断面正温养护时间≥26.7 d。采用微膨胀混凝土技术、“竖筋预紧”等方法在现浇混凝土中施加预压应力,可部分抵消井壁因温度变形产生的拉应力,葫芦素副立井井壁防裂效果良好。
Taking the example of cucurbitacin vertical shaft in Huijuel mine as an example, field measurements were made on the temperature field of the first bedrock frozen single-wall borehole in China. The technology of antifreeze and crack-prevention of the new single-wall was carried out Discuss. The results show that the method of increasing the wellbore temperature by properly increasing the distance from the freezing pipe to the wellbore and eliminating the need for direct contact between the foam insulation and the cast-in-situ concrete and the frozen bedrock can ensure that the strength of the new single- Growth period from frost damage, cucurbitacin measured vertical shaft cross-section positive temperature curing time ≥ 26.7 d. The micro-expansive concrete technology and prestressing of vertical tendons can exert pre-stress in cast-in-place concrete, which can partially offset the tensile stress caused by temperature deformation of the borehole wall.