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采用软土重塑试样进行了超载卸荷后再压缩过程的一维压缩试验。试验表明:超载卸荷后软土的再压缩过程较原压缩过程的主固结时间大大缩短,次固结系数在较长的时间内和时间无关,随再加荷压力的增大而增大,随着预固结压力的增大而减小,次固结系数和超载比之间具有规则的对应关系,可以用双曲线简化模型模拟;根据次固结系数双曲线模型建立的次压缩变形计算公式,既反应了软土本身性质的影响,也反应了预固结压力和再加荷压力的影响。工程算例数据和工程实测的工后沉降数据表明,使用改进的次压缩变形计算公式得到的结果,较之采用传统次压缩变形计算方法具有更高的可靠性,采用传统的次压缩变形公式计算再压缩软土的次压缩变形会产生较大的正偏差。
One-dimensional compression tests of the compression process after overloading and unloading were carried out by using soft soil remodeling samples. The experiment shows that the consolidation time of soft soil is greatly shortened than that of the original compression process after overloading and unloading, and the secondary consolidation coefficient has no relation with time in a long time and increases with the increase of reloading pressure , Decreases with the increase of pre-consolidation pressure, and there is a regular correspondence between secondary consolidation coefficient and overload ratio, which can be simulated by hyperbola simplified model. According to the sub-compression deformation established by hyperbolic model of secondary consolidation coefficient The calculation formula not only reflects the influence of soft soil itself but also reflects the influence of pre-consolidation pressure and reloading pressure. Engineering example data and engineering post-construction settlement data show that the results obtained by using the improved sub-compression deformation formula are more reliable than the traditional sub-compression deformation calculation method, and the traditional sub-compression deformation formula is used to calculate Secondary compression of re-compressed soft soil will have a larger positive deviation.