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

doi:10.12068/j.issn.1005-3026.2024.10.016

摘要/Abstract

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.

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

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.

Key words: fluidized solidified soil, response surface methodology, mucky residue, water reducer, fluidity, sand protective cushion

中图分类号:

TU 44

武亚军, 张海强, 占嘉城, 骆嘉成. 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[J]. 东北大学学报（自然科学版）, 2024, 45(10): 1494-1503.

Ya-jun WU, Hai-qiang ZHANG, Jia-cheng ZHAN, Jia-cheng LUO. Study on Replacement of Fluidized Solidified Soil with Sand Protective Cushion on Vacuum Combined Surcharge Preloading Membranes[J]. Journal of Northeastern University(Natural Science), 2024, 45(10): 1494-1503.

图/表 8

图1 实验流程图

Fig.1 Flow diagram of experiment

表1 淤泥质渣土基本物理性质

Table 1 Basic physical properties of mucky residue

含水率	液限	塑限	塑性指数	密度	有机质质量分数
%	%	%	塑性指数	g·cm^-3	%
64.3	42.5	20.9	21.6	1.62	3.2

图2 无添加淤泥质渣土流动度变化曲线（a）—固化剂掺量对流动度的影响曲线；（b）—含水率对流动度的影响曲线.

Fig.2 Variation curves of fluidity of non?admixture mucky residue

图3 外加剂调质淤泥质渣土流动度变化曲线（a）—固化剂掺量与含水率对流动度的影响曲线；（b）—含水率与外加剂掺量对流动度的影响曲线；（c）—固化剂掺量与外加剂掺量对流动度的影响曲线.

Fig.3 Fluidity variation curves of mucky residue conditioned with admixture

图4 淤泥质渣土经固化剂、外加剂处理前后的扫描电镜照片

Fig.4 Scanning electron micrographs of the mucky residue before and after treatment with solidifying agent and admixture

图5 无添加淤泥质渣土无侧限抗压强度变化曲线（a）—固化剂掺量与含水率对无侧限抗压强度的影响；（b）—含水率与养护龄期对无侧限抗压强度的影响；（c）—固化剂掺量与养护龄期对无侧限抗压强度的影响.

Fig.5 Strength variation curves of non?admixture mucky residue

图6 外加剂调质淤泥质渣土无侧限抗压强度变化曲线（a）—固化剂掺量与含水率对无侧限抗压强度的影响；（b）—含水率与外加剂掺量对无侧限抗压强度的影响；（c）—含水率与养护龄期对无侧限抗压强度的影响；（d）—固化剂掺量与外加剂掺量对无侧限抗压强度的影响；（e）—固化剂掺量与养护龄期对无侧限抗压强度的影响；（f）—外加剂掺量与养护龄期对无侧限抗压强度的影响.

Fig.6 Strength variation curves of WR-conditioned mucky residue

图7 固化剂、外加剂调质淤泥质渣土养护7 d的扫描电镜照片

Fig.7 Scanning electron micrograph of the solidifying agent and admixture conditioned mucky residue curing for 7 days

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