碎石桩加固松花江漫滩软土地基沉降特性分析

哈尔滨市松北区文化中心环路建设项目K1 ＋020～K1 ＋220路段地基为松花江河漫滩软土,土体含水量高、空隙比大,地基承载力低.以该路段软土地基为主要研究对象,从碎石桩加固地基的原理出发,采用地质勘察、室内试验、现场监测、理论分析的方法对碎石桩处理河漫滩软土地基效果以及河漫滩软土地基的沉降特征进行了研究.结果表明：碎石桩施工过程中,道路沉降速率较大,在9d内道路的沉降量达12 ～ 18 cm,碎石桩加速了软土地基的固结;碎石桩施工以后,道路的沉降速率明显减小,碎石桩显著地提高了软土地基的承载力.研究结果可以为河漫滩软土地基处理的设计与施工提供技术参考.

Analysis on Settlement Characteristics of Stone Pile Reinforcing Songhua River Alluvial Flat Soft Soil Foundation

The foundation of the K1 ＋ 020 -K1 ＋220 section of the circular road construction project in Cultural Centre of Song- bei District in Harbin belongs to soft soil of floodplain. The soil is characterized by high water content, big void ratio, and low bearing strength of the foundation. Taking the soft soil in the section as the research object and based on the principle of tone pile reinforcing foundation, the geological exploration, indoor test, site monitoring and theoretical analysis methods were employed to study the effect of stone pile treatment on the soft soil foundation of floodplain and the settlement characteristics. The study results showed that in the process of stone pile construction, the road settlement rate was larger and the settlement of the road can reach 12 - 18 cm in 9d and stone pile accelerated the road solidification; after stone pile construction, the road settlement rate decreased, which indicated that stone pile significantly improved the bearing strength of the foundation. The study results can provide technical reference for the design and construction of soft soil foundation of floodplain.