滨海盐渍土的固化方法及固化土的偏应力-应变  

Solidifying methods for inshore saline soil and its deviator stress-strain

作　　者：王沛[1] 王晓燕[2] 柴寿喜[1] 

机构地区：[1]天津城市建设学院天津市软土特性与工程环境重点试验室,天津300384 [2]中水北方勘测设计研究有限责任公司勘察院,天津300222

出　　处：《岩土力学》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)

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.

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 

分 类 号：TU411[建筑科学—岩土工程]