纤维含量是影响加筋土的重要参数,现有研究中纤维含量的取值范围一般较小,纤维含量较高的加筋土物理力学性能尚不清楚。为了研究较高纤维含量对稻草纤维加筋土的影响,设置10个纤维质量分数,采用直剪试验进行研究,探讨不同纤维含量对加...纤维含量是影响加筋土的重要参数,现有研究中纤维含量的取值范围一般较小,纤维含量较高的加筋土物理力学性能尚不清楚。为了研究较高纤维含量对稻草纤维加筋土的影响,设置10个纤维质量分数,采用直剪试验进行研究,探讨不同纤维含量对加筋土强度特性的影响,并通过扫描电镜(scanning electron microscope,SEM)试验和核磁共振(nuclear magnetic resonance,NMR)测试对纤维加筋土的微观结构特征进行分析。结果表明,加入纤维能有效提高土体的抗剪强度。纤维加筋土的增强机理与纤维含量有关,较低的纤维含量对土体孔隙率影响不大,加筋土以土骨架为基础;当纤维含量较高时,孔隙率明显增大,加筋土的主体结构将由土骨架和纤维骨架组成。展开更多
为了探明坡顶建筑荷重下加筋土挡土墙边坡坡体、挡墙及土工格栅的位移的变化规律,采用有限差分FLAC3D软件,建立了加筋土挡土墙支护的超高填方边坡的三维弹塑性有限差分精细化模型,开展了坡顶建筑荷重下加筋土挡土墙边坡的位移特性研究...为了探明坡顶建筑荷重下加筋土挡土墙边坡坡体、挡墙及土工格栅的位移的变化规律,采用有限差分FLAC3D软件,建立了加筋土挡土墙支护的超高填方边坡的三维弹塑性有限差分精细化模型,开展了坡顶建筑荷重下加筋土挡土墙边坡的位移特性研究。结果表明:加筋土挡土墙边坡墙体和墙后坡体存在较大的不均匀沉降;坡体、挡墙与土工格栅的位移变化规律不尽相同。研究结果可为科学设计布置加筋土挡土墙超高填方边坡坡顶上的建筑物提供有益的参考。In order to investigate the displacement changes of slope, retaining wall, and geogrid of geogrid reinforced slope under the load of the top building, a three-dimensional elastoplastic finite difference refined model of the geogrid reinforced ultra-high fill slope supported was established using the finite difference FLAC3D software, and the displacement characteristics of the geogrid reinforced slope under the load of the top building were studied. The results indicate that there is significant uneven settlement between the geogrid reinforced retaining wall and the slope body behind the retaining wall. The displacement variation patterns of slopes, retaining walls, and geogrids are not the same. The results can provide useful references for the scientific design and layout of buildings on the top of ultra-high fill slopes with geogrid reinforced retaining wall.展开更多
文摘纤维含量是影响加筋土的重要参数,现有研究中纤维含量的取值范围一般较小,纤维含量较高的加筋土物理力学性能尚不清楚。为了研究较高纤维含量对稻草纤维加筋土的影响,设置10个纤维质量分数,采用直剪试验进行研究,探讨不同纤维含量对加筋土强度特性的影响,并通过扫描电镜(scanning electron microscope,SEM)试验和核磁共振(nuclear magnetic resonance,NMR)测试对纤维加筋土的微观结构特征进行分析。结果表明,加入纤维能有效提高土体的抗剪强度。纤维加筋土的增强机理与纤维含量有关,较低的纤维含量对土体孔隙率影响不大,加筋土以土骨架为基础;当纤维含量较高时,孔隙率明显增大,加筋土的主体结构将由土骨架和纤维骨架组成。
文摘为了探明坡顶建筑荷重下加筋土挡土墙边坡坡体、挡墙及土工格栅的位移的变化规律,采用有限差分FLAC3D软件,建立了加筋土挡土墙支护的超高填方边坡的三维弹塑性有限差分精细化模型,开展了坡顶建筑荷重下加筋土挡土墙边坡的位移特性研究。结果表明:加筋土挡土墙边坡墙体和墙后坡体存在较大的不均匀沉降;坡体、挡墙与土工格栅的位移变化规律不尽相同。研究结果可为科学设计布置加筋土挡土墙超高填方边坡坡顶上的建筑物提供有益的参考。In order to investigate the displacement changes of slope, retaining wall, and geogrid of geogrid reinforced slope under the load of the top building, a three-dimensional elastoplastic finite difference refined model of the geogrid reinforced ultra-high fill slope supported was established using the finite difference FLAC3D software, and the displacement characteristics of the geogrid reinforced slope under the load of the top building were studied. The results indicate that there is significant uneven settlement between the geogrid reinforced retaining wall and the slope body behind the retaining wall. The displacement variation patterns of slopes, retaining walls, and geogrids are not the same. The results can provide useful references for the scientific design and layout of buildings on the top of ultra-high fill slopes with geogrid reinforced retaining wall.
