沿海可液化砂土地基处理方法对比试验研究  

Comparative experimental study of foundation treatment methods for coastal liquefiable sandy soil

作　　者：李春林 LI Chunlin(Fujian Quanzhou Survey and Design Institute Co.,Ltd.,Quanzhou 362012)

机构地区：[1]福建泉州勘测设计院有限公司,福建泉州362012

出　　处：《福建建筑》2024年第12期51-55,共5页Fujian Architecture & Construction

摘　　要：强夯、有/无填料振冲、振动沉管碎石桩、冲击碾压工艺,是当前常用的可液化砂土地基加固处理工艺,但当前常依靠经验选择。为此对各类工艺进行对比分析与综合评价,在某沿海砂土地基进行工程地基处理,分析得出:强夯、振动沉管、冲击碾压工艺的总成本相对较低,而振冲工艺的总成本高其3~5倍以上;强夯仅对深度3.15 m~6.15 m内的地基土标准贯入击数提升大,振冲工艺则对深度5.15 m以上的地基土标准贯入击数提升作用明显,振动沉管工艺的效果相对更加均衡,冲碾工艺效果最差;有填料振冲工艺和振动沉管工艺有更大的瞬态面波波速增量与更深的提升范围,强夯工艺的瞬态面波波速增量与提升范围相对为较小;所有工艺中,有填料振冲工艺综合表现最佳。The strong tamping,vibro-punching with/without filler,vibrating immersed tube rubble pile,and percussive crushing processes are the commonly used processes for reinforcing liquefiable sandy soil foundations at present,but the selection of the processes often relies on experience.Comparative analysis and comprehensive evaluation of the various types of technology,engineering foundation treatment in a coastal sandy soil foundation,the analysis concluded that:tamping,vibratory immersed tube,impact crushing process of the total cost is relatively low,while the vibro-punching process of the total cost of the process is higher than its 3~5 times;tamping is only the depth of 3.15 m~6.15 m within the standard penetration of the soil foundations of the number of hits to enhance the vibro-punching process for depths of 5.15m above the standard penetration of the soil foundations.The vibro-punching process can improve the standard penetration number of foundation soil significantly,the effect of vibro-sinking tube process is relatively more balanced,and the effect of ramming process is the worst;the filler vibro-punching process and the vibro-sinking tube process have larger transient surface wave speed increment and deeper lifting range,and the transient surface wave speed increment and lifting range of the ramming process are relatively small;the filler vibro-punching process has the best comprehensive performance among all the processes.

关 键 词：可液化砂土地基 地基加固处理 标准贯入试验 瞬态面波 综合评价 

分 类 号：TU4[建筑科学—土工工程]