深厚覆盖层振冲加固地基高效反滤层施工技术研究  

Study on Construction Technology of High-efficiency Inverted Layer for Vibroflotation Reinforcement of Deep Overburden Foundation

作　　者：周建 ZHOU Jian(Sinohydro Bureau 7 Co.,Ltd.,Chengdu Sichuan 610213)

机构地区：[1]中国水利水电第七工程局有限公司,四川成都610213

出　　处：《四川水力发电》2023年第S02期50-53,78,共5页Sichuan Hydropower

摘　　要：对于河谷复杂地基的处理通常采用振冲桩加固方法,但因地基互层渗透性差异大会导致振冲桩反滤层的实施效果存在问题。基于硬梁包水电站深厚覆盖层地基设计采用的振冲桩施工方案,针对滤材易损、成型质量难以保证等问题,提出了一种高效反滤层施工技术。其具体步骤为:编织PP土工布制成具备良好耐久性及耐腐蚀性的“香肠型”反滤管袋;采用分节“香肠型”搭链式反滤管袋填充方法,在振冲挤密过程中保持其自身延展力且仍能在振冲桩内精准布设,进而确保了反滤层的成型质量,为复杂地基处理振冲桩反滤层施工提供了一种新方法。该高效反滤层施工技术已获得发明专利授权,授权专利号:ZL 202111649012.3。The reinforcement with vibroflotation piles is often used for the treatment of complex foundations in river valleys.However,the difference in the permeability of the foundation interlayer leads to problems in the implementation of the inverted layer of the vibroflotation piles.Based on the construction scheme of vibroflotation piles adopted in the design of deep overburden foundation of Yingliangbao Hydropower Station,this paper proposes a construction technology of high-efficiency inverted layer in view of the difficulties of fragile filter materials and difficult in guaranteeing forming quality.The specific steps are:woven PP geotextile to make a"sausage-type"inverted bag with good durability and corrosion resistance;adopt a segmented"sausage-type"chain-type inverted bag filling method,which can maintain its own ductility during the vibration squeezing process and still accurately lay in the vibroflotation piles to ensure the forming quality of the inverted layer.It provides a new method for the construction of the vibroflotation piles inverted filter for complex foundation treatment.The construction technology of high-efficiency inverted layer has obtained invention patent,with the authorized patent number ZL 202111649012.3.

关 键 词：硬梁包水电站 “香肠型”反滤管袋 精准布设 振冲桩 反滤层施工技术 

分 类 号：TV7[水利工程—水利水电工程] TV52