特定宽度下人造硬壳层软土地基附加应力的数值分析  

Numerical Analysis of Additional Stress of Artificial Hard Crust Soft Soil Foundation under Specific Width

作　　者：赵伟强 ZHAO Wei-qiang(Guangdong Chaohui Expressway Co.,Ltd.,Shanwei 516600,China)

机构地区：[1]广东潮惠高速公路有限公司,广东汕尾516600

出　　处：《工业技术创新》2020年第4期103-106,138,共5页Industrial Technology Innovation

摘　　要：采用FLAC 3D软件,通过有限元方法考察人造硬壳层在不同厚度、宽度、变形模量下受到的竖向附加应力系数的变化,探讨有限宽度下人造硬壳层的受力机理。研究发现:软土地基附加应力扩散范围随着人工硬壳层厚度、宽度、变形模量的增加而增加,但增幅较小;在人工硬壳层满足工程需求时,无法通过改变硬壳层参数进一步显著提高地基承载力;在荷载较大的情况下,路基外存在竖向附加应力为负数的土体范围,如继续增加荷载,将发生滑动破坏。Finite element method based software FLAC 3D is used to investigate the variation of vertical additional stress coefficient of artificial hard crust under different thicknesses,widths and deformation modulus,and the stress mechanism of artificial hard crust under finite widths is discussed.The study shows that:the diffusion range of additional stress of soft soil foundation increases with the increase of thickness,width and deformation modulus of artificial hard crust,but the increase is small,so when the artificial hard crust meets the engineering requirements,it cannot further significantly improve the bearing capacity of foundation by changing the parameters of hard crust;under the condition of large load,there is a range of soil with negative vertical additional stress outside the subgrade,if the load is continuously increased,the sliding failure will occur.

关 键 词：软土地基 人造硬壳层 竖向附加应力 有限元 滑动破坏 

分 类 号：TU4[建筑科学—土工工程]