摘要
滨海盐渍土可使用水泥、石灰、粉煤灰和高分子材料SH固土剂单独及联合固化,以提高土的强度、抗变形能力和水稳性。为研究各种固化方法固化盐渍土的抗变形能力和偏应力-应变特征,通过三轴UU压缩试验得到盐渍土和6种固化盐渍土的偏应力-应变曲线。曲线显示:水泥+石灰类固化土呈应变软化型、石灰+粉煤灰类固化土呈应变软化型、石灰类固化土呈应变硬化型。掺入SH固土剂,提高了固化土的浸水前后的强度,同时也增强了固化土的水稳性。掺入SH固土剂使固化土达到偏应力峰值所需的应变增加,即抗变形能力增强;0.9%SH固土剂+12%石灰+36%粉煤灰固化土具有适中的强度、良好的弹性变形和水稳性的优点,作为轻质路堤填料使用,还可减少滨海地区软土路基的沉降量,这使其成为滨海盐渍土的6种固化方案中的最适宜方案。
Inshore saline soil can be solidified respectively and jointly with cement, lime, flyash and polymer SH agent for increasing the anti-deformation and the strength in air and water of the solidified soils. Triaxial compression test of six solidified soils have been carried out for studying the deviatoric stress-strain properties of the solidified soils. Generally, the deviatoric stress-strain curves of solidified soils with cement and lime and that with lime and fiyash are strain softening; that with lime are strain hardening. On the basis of the results of triaxial compression test, SH agent can increase the strength of solidified soil in air and water; furthermore, the strain can be increases at the maximum strength, i e. anti-deformation and elasticity of solidified soil is enhanced. It has been proved that the solidified soil with 0.9% SH agent and 12% lime and 36% flyash has the well properties, such as lightweight soil, higher strength, and well elasticity, in addition, it can decrease settlement of road foundation because of the lightweight soil.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第12期3939-3944,共6页
Rock and Soil Mechanics
基金
国家自然科学基金课题(No.40772166)
天津市高等学校科技发展基金课题(No.20090901)
关键词
滨海盐渍土
固化土
偏应力-应变
三轴压缩试验
固土材料
inshore saline soil
solidified soil
deviatoric stress-strain
triaxial compression test
solidified material
