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A large-size model test study on the consolidation effect of construction waste slurry under self-weight and bottom vacuum preloading
Geotextiles and Geomembranes ( IF 4.7 ) Pub Date : 2024-10-18 , DOI: 10.1016/j.geotexmem.2024.10.002
Wenhao Jiang, Liangtong Zhan, Junyao Lu

Bottom vacuum preloading (BVP) is the method of applying vacuum pressure at the bottom zone of soils to generate pore-water pressure difference between the top and bottom boundaries, thereby achieving the consolidation drainage. This study conducted a large-size model test to explore the engineering feasibility of combining self-weight and BVP to treat construction waste slurry (CWS). Through the treatment of the measures of self-weight consolidation (0–26 d) and BVP with a water cover (26–78 d), the average water content of CWS declined from 255.6% to 115.9%, and the volume reduction ratio reached 0.476. However, since these two measures could properly treat only the bottom CWS, the measures of BVP with the mud cover (78–141 d) and the natural air-drying (141–434 d) were performed to further decrease the CWS water content near the upper zone. The latter two-stage measures reduced the average water content of CWS to 84.9% and increased the volume reduction ratio to 0.581. Moreover, the measurements suggested that the treated CWS largely exhibited a shear strength of 10 kPa or more. Overall, the proposed approach appeared some engineering feasibility to treat CWS, and the performed test study could act as a reference for the practical treatment of CWS.

中文翻译:


自重和底部真空预压下建筑垃圾浆液固结效应的大尺寸模型试验研究



底部真空预压 (BVP) 是在土体底部区域施加真空压力,在顶部和底部边界之间产生孔隙-水压力差,从而实现固结排水的方法。本研究进行了大尺寸模型试验,探讨了自重和 BVP 相结合处理建筑垃圾浆 (CWS) 的工程可行性。通过自重巩固 (0–26 d) 和水覆盖 BVP (26–78 d) 的处理,CWS 的平均含水量从 255.6% 下降到 115.9%,体积减少率达到 0.476。然而,由于这两种措施只能适当处理底部 CWS,因此进行了泥浆覆盖 (78–141 d) 和自然风干 (141–434 d) 的 BVP 措施,以进一步降低上部区域附近的 CWS 含水量。后两阶段措施将 CWS 的平均含水量降低到 84.9%,并将体积减少率提高到 0.581。此外,测量表明,处理后的 CWS 大部分表现出 10 kPa 或更高的剪切强度。总体而言,所提出的方法似乎具有治疗 CWS 的一些工程可行性,并且进行的测试研究可以作为 CWS 实际治疗的参考。
更新日期:2024-10-18
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