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劈裂真空法加固软土固结性状研究 被引量:1

Consolidation analysis of combined method of vacuum preloading and pneumatic fracturing
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摘要 基于劈裂裂隙渗透性的分析,结合真空预压负压边界条件,建立了劈裂真空法固结性状分析模型,并利用理论模型分析裂隙位置、裂隙渗透性等因素对地基固结的影响.研究结果表明:理论固结模型计算得到的沉降值与室内模型试验结果吻合,裂隙加快了土体固结速率;当裂隙位于地基2/3深度时,裂隙提高地基固结速率最显著;随着裂隙渗透性增加,地基固结速率加快,当裂隙达到完全排水边界时,固结速率停止增长;随着土层厚度与砂井影响半径比值的增大,裂隙加快地基固结的速率明显. Combined method of vacuum preloading and pneumatic fracturing is an improved method of traditional vacuum preloading method, which belongs to the drainage consolidation method. However, the consolidation characteristics of the proposed method are never researched. Taking consideration of boundary of vacuum preloading, a consolidation model for the combined method is developed. Model test is used to verify the reliability of the consolidation model. The results indi- cate that the consolidation rate of sand-drained ground whose drainage conditions in the vertical direction are pervious top and impervious bottom is fastest when the fracture is located at the depth of 2/3 thickness of soil layer. With the increase of fracture permeability, the consolidation rate of foundation is accelerated. As the ratio of soil layer thickness and sand well radius increases, the consolidation rate of foundation is obviously exDedited.
出处 《扬州大学学报(自然科学版)》 CAS 北大核心 2016年第4期58-63,共6页 Journal of Yangzhou University:Natural Science Edition
基金 国家自然基金资助项目(51078083)
关键词 劈裂真空法 固结 模型试验 裂隙渗透性 参数分析 combined method of vacuum preloading and pneumatic fracturing consolidation modeltest fracture permeability parameter analysis
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