水泥搅拌桩处理泥炭土的固化机理及影响因素研究
Curing Mechanism and Influencing Factors of Cement Mixing Piles Reinforcing Peat Soil
冯荣先 1钟钙冰 1刘亮 1梁鉴源 1顾美湘2
作者信息
- 1. 中交四航局第一工程有限公司,广东 广州 510450
- 2. 广州大学 土木工程学院,广东 广州 510006
- 折叠
摘要
马来西亚东海岸铁路项目拟采用水泥搅拌桩加固滨海深厚泥炭土地基,该工法的关键是确定水泥配合比和添加剂.针对滨海泥炭土有机质含量高、环境酸性强等特点,开展泥炭土的物理力学试验,设计并实施多组配合比和影响因素下水泥土室内单轴压缩试验.试验结果表明:当水灰比从0.5增加到0.9,平均抗压强度减小了0.35 MPa;加入矿粉的固化效果较差,而加入粉煤灰或石膏后效果明显;加入固化剂后,7 d强度出现增长,早期强度平均增加了189.29%;与普通硅酸盐水泥相比,抗硫酸盐水泥对泥炭土的固化效果增加了9.5%;对比软可塑粉质黏土,该技术对泥炭土的固化效果更佳,平均抗压强度增加了127%.
Abstract
The cement mixing pile is used to reinforce the deep peat soil foundation in Malaysia's east coast railway construction.The key in this project is to determine the cement mix proportion and additives.Considering the high organic matter content and strong environmental acidity of coastal peat soil,physical and mechanical tests of peat soil and laboratory uniaxial compression tests of cement soil under different mix proportions and influencing factors were conducted.Test results show that the mean compressive strength decreases by 0.35 MPa with the increase in cement-water from 0.5 to 0.9.Adding mineral powder gives a relatively poor curing effect while adding fly ash or gypsum contributes an obvious improvement.The curing agent increases the early strength by about 189.29%with strength beginning to increase from 7 d.Compared with ordinary Portland cement,sulfate-resistant cement increases the curing effect on peat soil by 9.5%,and this technique shows a better curing effect on peat soil with an increase of the mean compressive strength by 127%compared with soft plastic silty clay.
关键词
泥炭土/水泥搅拌桩/固化机理/强度/影响因素Key words
peat soil/cement mixing pile/curing mechanism/strength/influencing factor引用本文复制引用
基金项目
国家自然科学基金(51908150)
广州市科技计划(SL2022A04J00985)
出版年
2024
国家科技期刊平台
NSTL
万方数据