固化磷石膏-疏浚淤泥混合土的工程性质研究

发布时间：2018-02-04 15:57

本文关键词： 磷石膏疏浚淤泥固化　出处：《四川大学学报(工程科学版)》2014年03期 　论文类型：期刊论文

【摘要】：基于传统的固化技术,因地制宜地提出了将磷石膏和疏浚淤泥预先混合成基质土,再添加水泥进行固化的方法,以期达到经济有效地将废弃物转化为良质土资源的目的。在几种养护龄期下,通过对固化的不同混合比磷石膏-疏浚淤泥混合土进行无侧限抗压强度试验、直剪试验和渗透试验以明确合理的磷石膏/疏浚淤泥混合比例以及固化混合土的工程性质。根据试验结果,在综合分析了固化混合土的强度及渗透性的基础上,得出基质土中的磷石膏和疏浚淤泥最佳质量混合比约为1∶3.5~1.2∶1,此混合比例的基质土中在仅掺ac=100 kg/m3的水泥的情况下无侧限抗压强度可达450~900 kPa左右,渗透系数k在10-5~10-6cm/s数量级。
[Abstract]:Based on the traditional curing technology, the method of pre-mixing phosphogypsum and dredged silt into matrix soil and adding cement to solidify was put forward according to local conditions. In order to achieve the purpose of converting wastes into good soil resources economically and effectively, the unconfined compressive strength tests of different mixed gypsum / dredged mixed soils with different curing ratios were carried out under several curing ages. Direct shear test and permeation test were used to determine the reasonable mixture ratio of phosphogypsum / dredged silt and the engineering properties of solidified mixed soil. Based on the test results, the strength and permeability of solidified mixed soil were comprehensively analyzed. The optimum mass mixing ratio of phosphogypsum and dredged silt is about 1: 3.5 / 1.2: 1. The unconfined compressive strength of the mixed matrix soil with only ac=100 kg/m3 cement can reach 450 ~ 900 kPa. The permeability coefficient k is in the order of 10 ~ (-5) ~ 10 ~ (-6) cm / s.
【作者单位】：昆明理工大学土木工程学院;中国有色金属工业昆明勘察设计研究院;
【基金】：国家自然科学基金青年基金资助项目(51108217) 云南省科技厅应用基础研究计划资助项目(2011FZ047)
【分类号】：TU521.3
【正文快照】： 为了保持湖泊、水库的蓄水能力及改善水质,常需进行疏浚,由此产生大量的疏浚淤泥[1-2]。在云南昆明地区,有“高原明珠”之称的滇池正进行大规模疏浚工作。至今已从滇池及周边河流中疏浚出1.0×107m3的淤泥,但这仅占湖区淤泥预计总量的1∶10左右,预计还有8×107至1.2×109m3的

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