中心排水注浆混凝土桩排水固结特性数值分析

Numerical Analysis on Drainage Consolidation Characteristics of Concrete Piles with Central Drainage

中心排水注浆混凝土桩是一种新型复合加固桩技术,立足珠海淤泥质软土,运用PLAXIS3D有限元,建立在真空负压条件下中心排水注浆混凝土桩单桩复合地基渗流固结计算模型,分析其孔隙水压力分布及消散变化性状,探讨了强度演化规律。结果表明,中心排水注浆混凝土桩具有沿整个桩分布直排式真空负压源的特点,使得中心排水注浆混凝土桩在真空负压条件下桩周软土加固效果显著和加固有效影响范围大,桩周软土随真空负压的加固从正常固结状态变化为超固结状态,强度和刚度得到提高,证实中心排水注浆混凝土桩实施真空负压是一种有效的软基加固手段。

Central drainage grouting concrete pile is a new type of composite pile reinforcement technique,based on muddy soft soil in zhuhai,using PLAXIS3 D finite element,based on the center under the condition of vacuum negative pressure drainage single pile composite foundation seepage consolidation grouting concrete pile calculation model,analysis the characters of pore water pressure distribution and lift change,intensity evolution is discussed.Results show that the central drainage grouting concrete pile has characteristics along the entire pile distribution give expulsion-typely vacuum negative pressure source,making center under the condition of vacuum negative pressure drainage grouting concrete pile pile soft soil reinforcement effect significantly effective influence scope is big,The reinforcement of soft soil with vacuum pressure from normal consolidation state to over-consolidation state.Confirmed that the vacuum drainage of grouting concrete piles in the center is an effective means of strengthening the soft foundation.