工程地质学报2025，Vol.33Issue(6)：2108-2118,11.DOI:10.13544/j.cnki.jeg.2024-0032
改良硫酸盐渍冻土的抗剪强度变化特征
VARIATION CHARACTERISTICS OF SHEAR STRENGTH OF IMPROVED SULFATE SALINE FROZEN SOIL
摘要
Abstract
Sulfate saline frozen soils are widely distributed in western China,where engineering issues related to salt heave,frost heave,settlement,differential settlement,and foundation corrosion have become increasingly significant.This study focuses on sulfate saline frozen soils prevalent in western China and treats them with different types and dosages of soil modifiers.The variations in shear strength before and after improvement were investigated through static triaxial tests conducted at subzero temperatures under different thermal conditions.The test results show that the maximum principal stress difference of sulfate saline frozen soil decreases as temperature rises.Compared to the value at 2 ℃,the maximum principal stress difference at-5 ℃ and-9 ℃ increased by 2.91％and 10.68％,respectively.Among the modifiers tested,cement had the most pronounced effect on improving the maximum principal stress difference,followed by quicklime and fly ash.While fly ash at dosages of 4％and 8％did not significantly affect the maximum principal stress difference,using 8％cement,8％quicklime,or 12％fly ash led to a more rapid increase.Specifically,compared to untreated soil,these treatments increased the maximum principal stress difference by 43.48％,30.43％,and 39.13％,respectively.Furthermore,all modifiers improved both cohesion and internal friction angle to varying degrees.Quicklime and fly ash increased cohesion by approximately 25％,whereas cement at a 12％dosage raised cohesion by about 77.88％and increased the internal friction angle by about 11.68％.These findings provide a reference for foundation treatment in sulfate saline frozen soil regions of western China.关键词
改良硫酸盐渍冻土/抗剪强度/三轴试验/主应力差-应变曲线Key words
Modified sulfate saline frozen soil/Shear strength/Triaxial test/Principal stress difference-strain curve分类
建筑与水利引用本文复制引用
张熙胤,赖孝冬,王义,崔明钊,于生生,王万平..改良硫酸盐渍冻土的抗剪强度变化特征[J].工程地质学报,2025,33(6):2108-2118,11.基金项目
国家自然科学基金项目(资助号:U21A2012,52068045),陇原青年创新创业人才(团队).This research is supported by the National Natural Science Foundation of China(Grant Nos.U21A2012,52068045)and Longyuan Young Innovative and Entrepreneurial Talents(Team). （资助号:U21A2012,52068045）
