山西龙矿主斜井黄土层施工技术的创新与实践

山西龙矿能源投资开发有限公司主斜井设计长度860m,倾角15°。井口以下有220m穿过黄土层,施工过程中遇到了两大难题:井口下90-130m段遇到含水层,黄土含水丰富,泥化严重,流动性强;井口下180-220m段,顶部黄土层厚度达到55-70m,进入深部带压区,随掘随垮塌和冒落,以致于施工现场困难重重。针对以上两种情况,分别采取不同的施工技术:对富水黄土层,采用U棚穿楔导峒的施工工艺,对深部带压黄土层,采用U棚导峒支护,最后完成永久支护。

Innovation and Practice of Loess Layer Construction Technology in Main Inclined Shaft of Shanxi Long Mine

The designed length of the main inclined shaft of Shanxi Longkuang Energy Investment and Development Co.,Ltd.is 860 meters and the inclination angle is 15°.220 meters below the wellhead pass through the loess layer,and two major problems were encountered during the construction process:the 90-130 meters section below the wellhead encounters aquifers,the loess is rich in water,serious siltification,and strong fluidity;the section 180-220 meters below the wellhead,The top loess layer has a thickness of 55-70 meters,enters the deep pressure zone,collapses and falls along with the excavation,which makes the construction site difficult.In view of the above two situations,different construction techniques were adopted:for the water-rich loess layer,the U shed was used to penetrate the wedge guide tunnel;for the deep pressure loess layer,the U shed guide tunnel was used to support,and finally the permanent support was completed.