取代真空联合堆载预压膜上砂保护垫层的流态固化土研究
Study on Replacement of Fluidized Solidified Soil with Sand Protective Cushion on Vacuum Combined Surcharge Preloading Membranes
武亚军 1张海强 1占嘉城 1骆嘉成2
作者信息
- 1. 上海大学 力学与工程科学学院,上海 200444
- 2. 浙江省第十一地质大队,浙江 温州 325006
- 折叠
摘要
真空联合堆载预压地基处理工程中需要砂保护垫层,许多地区砂源紧张,因此开展研究利用淤泥质渣土配制流态固化土用于替代预压膜上砂保护垫层.通过进行大量的无侧限抗压强度和流动度等实验,探究淤泥质渣土含水率、固化剂掺量和外加剂等因素对制配流态固化土流动度和无侧限抗压强度的影响.结果表明:提高土体含水率或添加外加剂均可有效改善流动度,其中外加剂改善效果更显著;固化剂掺量是影响无侧限抗压强度的最主要因素,添加外加剂会降低无侧限抗压强度;对于含水率120%～140%的土体,不需要外加剂,固化剂掺量为土体质量的5%～7%时配制的流态固化土可以替代砂保护垫层;对于含水率80%～100%的土体,在5%～7%固化剂掺量下需添加一定的外加剂.
Abstract
The sand protective cushion is required in vacuum combined surcharge proloading foundation treatment project and the sand source is abnormally tight in many areas.The research on using mucky fluidized solidified soil to replace protective cushion on vacuum combined surcharge preloading membranes is carried out.Numerous tests on unconfined compressive strength test and fluidity test are conducted to investigate the effects of parameters such as water content,solidifying agent dosage,and admixture dosing on the fluidity and strength of the preparation of fluidized solidified soil.The results show that increasing the water content of mucky residue or adding admixture can effectively improve the fluidity,and the admixture is more significant.The amount of solidifying agent is the most crucial factor to influence the strength,and increasing the admixture will reduce the strength.In addition,for the mucky residue with the water content of 120%～140%,there is no need for admixture.When the amount of solidifying agent is 5%～7%of the mass of the mucky residue,it can replace the sand cushion;for the mucky residue with the water content of 80%～100%,adding certain admixture based on 5%～7%solidifying agent can also meet the requirements of the protective cushion.
关键词
流态固化土/响应面法/淤泥质渣土/减水剂/流动度/砂保护垫层Key words
fluidized solidified soil/response surface methodology/mucky residue/water reducer/fluidity/sand protective cushion引用本文复制引用
出版年
2024
NETL
NSTL
万方数据