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Mechanism of pore water seepage in soil reinforced by step vacuum preloading
Bulletin of Engineering Geology and the Environment ( IF 4.2 ) Pub Date : 2021-01-11 , DOI: 10.1007/s10064-020-02075-4
Wenchong Shan , Hui-e Chen , Xiaoqing Yuan , Wenliang Ma , Hui Li

A laboratory model experiment of step vacuum preloading (SVP) for dredger fills was performed. The soil moisture content and water discharge rate were measured. The seepage mechanism of pore water was analyzed based on the theory of drainage consolidation. The results indicated that the seepage fluid mostly consisted of free water during self-weight sedimentation and under 10 kPa vacuum pressure in the SVP test. The stage corresponding to the application of 20 kPa vacuum pressure was the transitional stage in which both the free water and the loosely bound water participated in the seepage. When higher vacuum pressure was applied, the loosely bound water mostly participated in the seepage. In the SVP test, the complete potential difference channels were established in the test bucket during self-weight sedimentation. The vacuum channels at the center began to form when 10 kPa vacuum pressure was applied, and the free water near the sidewall was discharged through the potential difference channel. With 20 kPa vacuum pressure, the vacuum channel developed continuously from the drainage board to the sidewall of the test bucket, completing the process and ultimately stabilizing as the vacuum pressure increasing. The study of the seepage mechanism of pore water during SVP test is significant for the analysis of pore water seepage under vacuum pressure during the consolidation of soft soil foundation. This study contributes to the existing theory related to vacuum preloading consolidation methods, providing theoretical guidance for the analysis of soil consolidation under drainage conditions.



中文翻译:

阶梯真空预压加固的孔隙渗水机理。

进行了疏vacuum填土的阶梯式真空预压(SVP)的实验室模型实验。测量土壤水分和排水速率。基于排水固结理论分析了孔隙水的渗流机理。结果表明,在自重沉降过程中,在SVP测试中,在10 kPa真空压力下,渗流液主要由游离水组成。对应于施加20 kPa真空压力的阶段是过渡阶段,在该阶段中,自由水和松散结合的水都参与了渗流。当施加较高的真空压力时,松散结合的水主要参与渗流。在SVP测试中,自重沉降过程中在测试桶中建立了完整的电势差通道。当施加10 kPa真空压力时,开始在中心形成真空通道,并且靠近侧壁的自由水通过电势差通道排出。真空压力为20 kPa时,真空通道从排水板一直延伸到测试桶的侧壁,从而完成了整个过程,并最终随着真空压力的增加而稳定下来。研究SVP试验中孔隙水的渗流机理,对于分析软土地基加固过程中真空压力下的孔隙水渗漏具有重要意义。这项研究为有关真空预压固结方法的现有理论做出了贡献,为排水条件下的土壤固结分析提供了理论指导。侧壁附近的自由水通过电位差通道排出。真空压力为20 kPa时,真空通道从排水板一直延伸到测试桶的侧壁,从而完成了整个过程,并最终随着真空压力的增加而稳定下来。研究SVP试验中孔隙水的渗流机理,对于分析软土地基加固过程中真空压力下的孔隙水渗漏具有重要意义。这项研究为有关真空预压固结方法的现有理论做出了贡献,为排水条件下的土壤固结分析提供了理论指导。侧壁附近的自由水通过电位差通道排出。真空压力为20 kPa时,真空通道从排水板一直延伸到测试桶的侧壁,从而完成了整个过程,并最终随着真空压力的增加而稳定下来。研究SVP试验中孔隙水的渗流机理,对于分析软土地基加固过程中真空压力下的孔隙水渗漏具有重要意义。这项研究为有关真空预压固结方法的现有理论做出了贡献,为排水条件下的土壤固结分析提供了理论指导。真空通道从排水板到测试桶的侧壁不断发展,完成了整个过程,最终随着真空压力的增加而稳定。研究SVP试验中孔隙水的渗流机理,对于分析软土地基加固过程中真空压力下的孔隙水渗漏具有重要意义。这项研究为有关真空预压固结方法的现有理论做出了贡献,为排水条件下的土壤固结分析提供了理论指导。真空通道从排水板到测试桶的侧壁不断发展,完成了整个过程,最终随着真空压力的增加而稳定。研究SVP试验中孔隙水的渗流机理,对于分析软土地基加固过程中真空压力下的孔隙水渗漏具有重要意义。这项研究为有关真空预压固结方法的现有理论做出了贡献,为排水条件下的土壤固结分析提供了理论指导。研究SVP试验中孔隙水的渗流机理,对于分析软土地基加固过程中真空压力下的孔隙水渗漏具有重要意义。这项研究为有关真空预压固结方法的现有理论做出了贡献,为排水条件下的土壤固结分析提供了理论指导。研究SVP试验中孔隙水的渗流机理,对于分析软土地基加固过程中真空压力下的孔隙水渗漏具有重要意义。这项研究为有关真空预压固结方法的现有理论做出了贡献,为排水条件下的土壤固结分析提供了理论指导。

更新日期:2021-01-11
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