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江苏省连云港赣榆港区陆域采用航道和港池的疏浚土方吹填形成作业港区,吹填工艺以绞吸式疏浚为主,疏浚涉及土层为粘土和砂土,由此形成了粘土和砂土的混合土地基。为了提高地基承载力和均匀性,采用了强夯法对地基进行加固,但是目前对夹砂粘土地基强夯加固的理论和实践较少。为此,以砂夹粘土构成的混合土地基为对象,测试了多种能量单点夯击时的地基土夯沉量、孔压和夯坑周围土体强度等参数,探讨了强夯法加固该类地基的加固深度和水平影响范围。结果表明:对于该类地基而言,有效加固深度修正系数取0.35~0.5为宜;强夯过程中,孔压与强度的增长范围不对应,即孔压影响范围远大于强度影响范围。
The land area of Ganyu Port in Lianyungang, Jiangsu Province is dredged by channeling and harbor dredging. The dredging is mainly dredging and dredging. The dredging involves the clay and sand as the soil layer, thus forming the clay And sand mixed soil foundation. In order to improve the bearing capacity and uniformity of the foundation, dynamic compaction method is used to reinforce the foundation. However, there are few theories and practices on dynamic consolidation of sand-clayey clay foundation. For this purpose, the mixed soil foundation composed of sand-clayey clay is taken as the object, and the parameters such as the settlement of foundation soil compaction, the pore pressure and the strength of soil around the crater are tested when a variety of energy is single- The depth and level of reinforcement of such foundation affect the scope. The results show that for these kinds of foundations, the effective depth correction coefficient should be 0.35 ~ 0.5. During the dynamic compaction, the pore water pressure does not correspond to the growth range of strength, that is to say, the influence range of pore pressure is much larger than the influence range of strength.