| 米文静,张爱军,任文渊,杨涛,黄绵松,刘宏泰.轻量土减重换填消减黄土湿陷的方法研究[J].水利学报,2021,52(1):51-61 |
| 轻量土减重换填消减黄土湿陷的方法研究 |
| Method for reducing self-weight collapsibility of loess using the replacement of lightweight soil |
| 投稿时间：2020-02-18 修订日期：2020-12-22 |
| DOI：10.13243/j.cnki.slxb.20200084 |
| 中文关键词: 自重湿陷性黄土 轻量土 离心模型试验 换填 |
| 英文关键词: self-weight collapsibility of loess lightweight soil centrifugal model test replacement |
| 基金项目:国家自然科学基金项目（51978572）；陕西省重点研发计划项目（2017ZDXM-SF-074）；固原海绵城市建设及运营关键技术研究项目（SCHM-2018） |
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| 中文摘要: |
| 湿陷性黄土地区海绵城市建设中存在路面透水要求与黄土湿陷的技术矛盾。现有的消除黄土湿陷方法不能同时满足适合线状工程、工程量小、允许雨水入渗等要求。从黄土湿陷是浸水与上覆压力共同作用、二者缺一不可的原理出发，在浸水不可避免的情况下，提出了采用轻量土换填减重、减轻上覆压力从而减小人行道与非机动车透水道路路基湿陷量的地基处理新方法，开展了室内湿陷试验及换填计算，并通过多地层离心模型试验进行了效果验证。研究表明：依据室内湿陷试验结果计算得出轻量土换填1.5 m前后，道路场地自重湿陷量减小了22.73%；依据离心模型试验得出换填前后道路场地自重湿陷量减小23.04%，两者相差0.31%。两种方法均证明轻量土减重换填可有效消减道路场地湿陷量，当场地自重湿陷等级为Ⅱ级，且自重湿陷土层分布在浅层时，该方法能够有效消除自重湿陷性，且具有操作简单、适合透水道路等线状工程和不阻断水分下渗的优势。 |
| 英文摘要: |
| There is a technical contradiction between the requirement of road surface water permeability and loess collapsibility in the construction of sponge city in collapsible loess area. The existing method for eliminating the loess collapsibility cannot meet the requirements of linear projects with small work amount and allowing rainwater infiltration. Based on the principle of the mutual effect of water immersion and over- lying pressure on loess collapsibility, in the case of inevitable water immersion, a new method of founda- tion treatment is proposed to use lightweight soil to replace the weight loss and reduce the overburden pres- sure so as to reduce the collapsibility of the pedestrian and non-motor vehicle road subgrade. The indoor collapsibility test and replacement calculation are carried out, and the treatment effect is verified by a multi-stratigraphic centrifugal model test. The research indicates that the site self-weight collapsibility was reduced by 22.73% via the replacement calculation of the indoor collapsibility test after the replacement by 1.5m, and the self-weight collapsibility obtained by the centrifugal model test was reduced by 23.04%, with the difference of 0.31%. Both methods prove that the lightweight soil weight loss replacement method can effectively reduce the site collapsibility. When the level of collapsibility is level Ⅱ,and the soil layer distribution in shallow,this method can eliminate the collapsibility effectively. In addition,this method has the advantages of simple operation,suitability for linear projects such as permeable roads and allow rainwa- ter infiltration |
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