土夹石换填地基静态变形模量的影响因素分析

Analysis of influencing factors of replacing foundation with soil and rock on static deformation modulus E_(v2)

为研究不同因素对土夹石换填地基静态变形模量E_(v2)的影响,利用自制的E_(v2)室内检测装置,试验分析了碎石颗粒级配、含石率、含水率、压实度、密度、干密度及孔隙比对土夹石填料E_(v2)的影响。结果表明:在单一碎石粒径条件下,当碎石粒径小于20 mm时,E_(v2)随碎石粒径的增大而增大,良好颗粒级配碎石可有效提高填料的E_(v2)值,E_(v2)随含石率的增加而增加,但增长幅度逐渐变缓;E_(v2)随含水率的增加呈现先增大后减小的变化趋势,在最优含水率16%附近出现最大值;E_(v2)随压实度、密度与干密度的增加而增大,三者对E_(v2)的影响趋势基本一致;E_(v2)随孔隙比的增大而减小,当孔隙比处于较小值范围内时,其变化对E_(v2)的影响最大。

This paper is concerned with the influence of different factors on the static deformation modulus E_(v2) for replacing foundation filled with soil and rock.The study consists of testing and analyzing the influence of the particle composition,stone content,water content,compaction degree,density,dry density and pore ratio on the soil and gravel filling E_(v2) by using the self-made indoor detection device E_(v2).The results show that when the particle size is less than 20 mm,the E_(v2) increases with the increase of the particle size of the gravel,and the good particle grading of the gravel can effectively improve the E_(v2) value of the filler.E_(v2) increases with the increase of the stone content,but the growth rate is gradually slow.With the increase of water content,E_(v2) firstly increases and then decreases,and the maximum value appearesat the optimal water content of 16% or so.E_(v2) increases with the increase of compaction degree,density and dry density,and the influence trend of the three factors on E_(v2) is basically the same.E_(v2) decreases with the increase of the pore ratio,and the change of the pore ratio has the greatest effect on E_(v2) when the pore ratio is in the small range.