红砂岩土在多点冲击荷载下的叠加作用效应

发布时间：2018-03-17 16:36

本文选题：强夯法　切入点：红砂岩风化土　出处：《四川建筑科学研究》2014年05期 　论文类型：期刊论文

【摘要】：采用改装的击实仪对赣南地区红砂岩土进行室内击实试验,通过预埋带有编号的钢珠测试土体的空间位移,采用自制环刀取土测试不同位置土体的密度变化。试验研究表明,在冲击荷载作用下,中心点处的竖向位移和密度叠加效果随着击数或落距的增大而增强;竖向位移和密度叠加效果随着夯点间距的增大而减弱。随着击数的增加,中心点处土体粘聚力和内摩擦角都在增大。土体抗剪强度叠加效果随着夯点间距的增大而减弱,特别是在夯点间距从3.5倍增大到4倍锤径时,减弱程度非常明显。构成红砂岩土抗剪强度的关键因素是粘聚力。本文所取得的相关结论对红砂岩填土地基强夯加固的进一步研究、设计和施工具有一定的帮助。
[Abstract]:Laboratory compaction test of red sandstone soil in south Jiangxi was carried out by using a modified compaction instrument. The spatial displacement of soil mass was measured by pre-burying steel beads with serial numbers, and the density of soil at different positions was measured by self-made ring knife. The experimental study shows that, Under the impact load, the superposition effect of vertical displacement and density at the center point increases with the increase of the number of hits or the drop distance, the effect of vertical displacement and density superposition decreases with the increase of the distance between the tamping points, and with the increase of the number of hits, the superposition effect of vertical displacement and density increases with the increase of the number of hits. Both the cohesive force and the angle of internal friction are increasing at the center point. The superposition effect of soil shear strength weakens with the increase of the distance between the tamping points, especially when the spacing of the tamping point is doubled from 3.5 to 4 times the diameter of the hammer. The cohesive force is the key factor of the shear strength of red sandstone soil. The relevant conclusions obtained in this paper are helpful to the further study, design and construction of the dynamic compaction reinforcement of the red sandstone fill soil foundation.
【作者单位】：江西理工大学建筑与测绘工程学院;
【基金】：国家自然科学基金资助项目(50869002) 江西省教育厅资助项目(GJJ08290)
【分类号】：TU411

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