摘要
为解决滇中引水盾构始发段隧洞高含水率泡沫改良渣土外运难题,以坍落度为评价指标,基于正交试验研究水泥、生石灰、粉煤灰和氧化镁等固化材料质量配比对盾构渣土流动性的影响规律,并分析盾构泡沫改良渣土的微观固化机理以及泡沫的变化过程,提出合适的渣土外运固化技术。试验结果表明,影响渣土固化流动性的主要因素为粉煤灰与氧化镁质量之和与水泥和生石灰质量之和之比,获得固化材料最佳质量配比为氧化镁∶粉煤灰∶水泥∶生石灰=1∶19∶24∶36;固化过程会加速泡沫破灭并生成凝胶降低渣土流动性;相较于采用纯水泥和脱水系统对现场盾构渣土进行固化处理,最佳质量配比下的固化处理方案是一种更为经济有效的方式。
In order to solve the problem of high water content muck transported out of the Central Yunnan Water Diversion Project shield tunnel,in this paper,taking slump as evaluation index,the influence law of mass ratio of cement,quicklime,fly ash,and magnesium oxide on the fluidity of shield muck was discussed based on the orthogonal test,and the solidification micro-mechanism of the shield foam-conditioned muck and the change process of the foam were analyzed,and appropriate solidification technology for muck transportation was proposed.The results showed that the main factors influencing the fluidity of shield muck solidification were the ratio of the sum of fly ash and magnesium oxide mass to the sum of cement and quicklime mass.The best mass ratio of solidifying materials of shield muck in upper soil and lower rock strata was magnesium oxide∶fly ash∶cement∶quicklime=1∶19∶24∶36.The solidification process would accelerate the bursting of foam and generate gel to reduce the fluidity of muck.Compared with the use of cement or dehydration equipment to solidify the field shield muck,it was a more economical and effective way to solidify the muck with the solidifying agent at the best mass ratio.
作者
杨红霞
杜俊
龚振宇
肖钢
倪准林
王树英
YANG Hongxia;DU Jun;GONG Zhenyu;XIAO Gang;NI Zhunlin;WANG Shuying(Kunming Branch of Central Yunnan Provincial Water Diversion Project Construction Administration Branch,Kunming 650051,China;Yunnan Survey and Design Institute of Water Conservancy and Hydropower,Kunming 650021,China;The Electricity Engineering CO.,LTD under CREC NO.5 Group,Changsha 410205,China;School of Civil Engineering,Central South University,Changsha 410075,China)
出处
《森林工程》
北大核心
2023年第3期172-181,共10页
Forest Engineering
基金
国家自然科学基金项目(52022112)。
关键词
盾构隧洞
高含水率
泡沫改良
正交试验
流动性
渣土固化
Shield tunnel
high water content
foam-conditioned
orthogonal test
fluidity
muck solidification
