煤矿主斜井掘进穿过流砂层施工技术研究

为了保证宁夏地区宋新庄矿主斜井井筒顺利安全穿过厚含水流砂层,对井筒穿过含水层的含水情况及地质情况进行分析,采用注浆加固和地表降水的井筒过厚含水流砂层施工方案,对开挖完成后的井筒结构进行了设计.利用ANSYS数值模拟软件对主斜井井筒的井壁结构的稳定性及安全性进行分析,并结合井壁受力实时监测,对井壁结构的稳定性进行验证,结果表明,井壁结构设计合理,可为同类工程借鉴.

四股泉矿区斜井过流砂层施工技术

四股泉矿区各矿井在斜井施工时,在地面25m以下遇到4～10m厚的流砂层,为了确保施工安全、降低成本、缩短工期,研究采用板桩法治理流砂层,并从板桩法固砂、短掘短进支护工艺和漏砂及垮空处理方法三方面对斜井过流砂层施工技术进行了论述。结果表明,采用该施工方法四股泉矿区三个矿井的斜井均顺利地通过了流砂层,使工程进度、质量都达到了较为理想的效果,可为同类斜井施工提供借鉴。

置换注浆工艺在立井表土过含水砂层中的应用

注浆工艺是传统的防治水施工工艺,在立井井筒防治水施工中占主要地位。目前,立井井筒表土段穿过流砂层时,多采用冻结法施工,但采用冻结法施工不仅造价非常高,并且施工工期较长。当井筒表土段穿过的含水砂层较少时,可采用置换注浆工艺进行治理,这样不仅可以大幅减少建井成本,还可以缩短建井工期。详细介绍了置换注浆施工工艺,通过对施工工程开挖后验证,采用该工艺注浆效果达到了设计要求。

Water shutoff model test in water-rich sandy stratum by phosphoric acid-water glass grout

The rheological behavior of phosphoric acid-water glass grout in different mixing ratios was studied. Grout made of water glass with Baume degree of 20° and 13.4% phosphoric acid by 1:1 volume ratio is found to be more effective in stopping water. Laboratory model test of water shutoff by grouting was conducted. Test results show that the diffusion length and water cutoff effect of the grout are significantly improved as the grout head is raised, due to the dilution of underground water, and it takes the grout longer than its gel time to cut off water.