湿陷性黄土地基强夯和冲击压实技术经济分析

0引言湿陷性是指土在自重或附加应力与自重共同作用下受水浸湿后产生急剧而大量的下沉。国标中规定:当sδ≥0.015时,为湿陷性黄土。通常湿陷性黄土地基较多采用强夯法处理,其主要特点是适应性强,经济简便;而冲击压实技术是20世纪90年代从南非蓝派公司引进,具有减少工后沉降效果

Techno-economic analysis of dynamic compaction and impact compaction for foundations of collapsible loess

In this article a discussion is held on the relationship between the modulus of soil deformation and the shear wave velocity with a study performed as well of the moduli of gravel pile deformation. From the analysis of field test data, a regression model is obtained of the moluli of the pile deformation. Based on the formula of soil stress ratio and modulus ratio of the pile, and through establishing the relation between the Raleigh wave and the compressive modulus of foundation soil, is instituted a computing model to determine the soil stress ratio of the gravel pile compound foundation by making use of the Raleigh wave, of which the influential elements are also discussed. By way of engineering instances, a comparison is conducted between the computed value and the static load test value to prove the test reliable.