滇池湖积相泥炭质土中三轴深搅桩加固作用探讨

Discussion on the reinforcement effect of triaxial deep mixing pile on lacustrine peat soil in Dianchi Lake

采用三轴深搅桩进行地基加固及防渗处理是常用的工程技术措施,但在有机质含量高的泥炭质土中应用效果如何,何种施工工艺能够满足工程需要,如何进行加固效果检验等问题,还需要进行研究分析。本研究经对有机质土及泥炭质土的湖相沉积软土地层进行三轴深搅止水帷幕施工后,采用多种方法进行施工效果检测,结果表明:(1)场地内原厚度达7 m的泥炭质土已基本被其下部的粉土、黏性土置换后与水泥浆均匀拌和,止水效果良好;(2)浅部的水泥搅拌桩芯土抗压强度指标比深部略低。通过对滇池湖湘沉积软土中三轴深搅桩的施工工艺及质量检测的分析,可为以后类似工程提供经验和借鉴。

The use of triaxial deep mixing pile for foundation reinforcement and anti-seepage treatment is a common engineering technical measure,but the application effect in peaty soil with high organic matter content,which construction technology can meet the engineering needs,and how to test the reinforcement effect still need to be studied and analyzed.In this study,after the construction of the lacustrine soft soil layer of organic soil and peaty soil with a three-axis deep stirring curtain,a variety of methods were used to test the construction effect.The results show that:(1)The peaty soil with a thickness of 7 m in the site has been basically replaced by the silt and clay under it,and then mixed with cement slurry evenly,and the water sealing effect is good;(2)The compressive strength index of the shallow cement mixing pile core soil is slightly lower than that of the deep soil.Through the analysis of the construction technology and quality inspection of the three-axis deep mixing pile in the soft soil deposited in Huxiang,Dianchi Lake,it can provide experience and reference for similar projects in the future.