真空预压联合石灰稳定法改良淤泥土试验研究

Experimental study of vacuum preloading of lime stabilized sludge

在工程用土资源越来越紧张和环境日益恶化的情况下淤泥资源化利用成为一个亟待解决的问题。通过向河底淤泥中掺入一定量的生石灰,再用真空预压结合外加剂木质素磺酸钙来改善土体的渗透、强度和变形等特性,总结并分析了掺木量对稳定排水量,稳定沉降量、强度、孔隙等的影响以及真空预压后石灰稳定土龄期下土体强度的变化规律。试验结果表明,抽真空后改良土具有较低含水率,土体强度增长较大,孔隙较小,后期沉降较小,加固土体以满足填筑用土要求,经济性分析表明该法是可以接受的。

when environment is deteriorating continuely,and the fitting soils soil for engineering are short and become more expensive.Technique for converting soft sludge to fitting engineering soil with content strength is very important and urgent.By mixing an extent lime to sludge dredged from riverway,and then,carrying on vacuum preloading added calcium lignosulfonate,serials of quality have been improved,including coefficient of permeability,unconfined compression strength and settlement deformation etc.,at one time,the relationships of dosages of calcium lignosulfonate and stable drainage-water volume and stable settlement and unconfined compression strength and void ratio would be studied and analyzed.The test results show that the strength is growing more quickly,hole volume of soil is being squeezed to a smaller,and subsequent settlement is becoming more little under lower water content situation after vacuum preloading.The soil will be consolidated to satisfy the standard qualification of fill.At last,through economical analysis,it is shown that this way could be accepted.