梅州抽水蓄能电站高压电缆竖井施工技术

Construction Technology of Front Well Drilling Method Under the Geological Conditions of Kaolin

梅州抽水蓄能电站高压电缆上竖井在施工过程中,原计划采用反井钻机施工导孔、分次扩挖、底部出渣的方式施工。但是受高岭土遇水易软化等物理特性影响,在施工过程中出现钻杆偏斜率过大、卡钻、掉钻等现象。方案调整为全断面正井法自上而下施工。方案调整后,解决了高岭土地质条件下,反井法施工成功率低的问题,也为高龄土地质条件下正井法施工积累了宝贵经验。

During the construction process of the high-voltage cable shaft of Meizhou Pumped Storage Power Station,due to the uncertainty of the success of the reverse drilling rig construction under the kaolin land quality conditions,the construction plan of the kaolin section was changed from the original design using reverse drilling and bottom slag discharge method Utilize the full-section vertical well method to construct from top to bottom.After the adjustment of the plan,it not only avoided the problem of low success rate of reverse well construction under Kaolin land quality conditions,but also accumulated valuable experience for the positive well construction under the condition of senior land quality.