滨海盐渍土的固化方法及固化土的偏应力-应变

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。

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

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 flyash 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.