摘要
针对里必矿副井冻结中冻结壁无法按时交圈的问题,综合测温数据及矿区水文地质情况,判断出冻结壁在砂卵石层冻结孔处的"缺口"位置,并对砂卵石层冻结温度场的演化规律进行了数值计算。通过对比冻结壁轮廓和测温孔数据,判断出该层位地下水流速达9m/d,原方案的冻结壁交圈时间远超预计工期。基于降低地下水流速、减少冷量损失、加强局部冻结的技术原理,提出了"控""注""冻"相结合的冻结壁弥合技术;依据冻结壁发展情况,并考虑地下水流速、流向的影响,确定了注浆孔、加强冻结孔的位置和数量,通过数值计算对冻结壁缺口的弥合过程进行了预测。工程实施结果表明:里必矿副井在完成冻结壁弥合施工21d(预测17d)后,水文孔开始冒水,冻结壁温度场发育恢复正常,确保了井筒施工安全顺利完成。
The frozen wall cannot be closed on time during the auxiliary shaft construction in Libi Mine, as there was a water inrush gap in the sand and gravel layer of the frozen wall. The evolution mechanism of freezing temperature field in the sand and gravel layer was studied using numerical calculation. And by comparing the contour of the frozen wall and the temperature data of measuring holes, it was judged that the groundwater velocity of this layer was 9 m/d, and the closure time of the frozen wall would far exceed the expected construction period using the original scheme. Based on the principle of reducing groundwater flow rate and cooling loss while strengthening local freezing, a control-grout-freeze fast closing technology was proposed for the water inrush gap. According to the development of the frozen wall and the influence of groundwater velocity and flow direction, the positions and quantity of the grouting holes and the enhanced freezing holes were determined. The closing process of the water inrush gap of the frozen wall was predicted by numerical calculation. And the implementation results showed that, the hydrological hole of auxiliary shaft of Libi Mine started to gush water 21 days(17 days predicted) after the frozen wall is closed.
作者
程桦
王彬
赵久良
姚直书
荣传新
CHENG Hua;WANG Bin;ZHAO Jiu-liang;YAO Zhi-shu;RONG Chuan-xin(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China;Safety Science and Engineering Postdoctoral Research Station,Anhui University of Science and Technology,Huainan 232001,China;Postdoctoral Research Station,China Coal Mine Construction Group Co.,Ltd.,Hefei 230091,China;China Coal Huajin Group Libi Coal Mine,Jicheng 048000,China)
出处
《煤炭工程》
北大核心
2021年第10期1-8,共8页
Coal Engineering
基金
国家自然科学基金资助项目(51878005,51874005)
安徽省科技重大专项资助项目(202003c08020007)
安徽省自然科学基金资助项目(2108085QE251)。
关键词
砂卵石地层
冻结壁
地下水流速
涌水缺口
弥合技术
sand and pebble formation
frozen wall
groundwater velocity
water inrush gap
gap closing technology
