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在考虑涂抹区土体水平渗透系数3种变化模式即水平渗透系数不变、呈线性变化和呈抛物线变化的情况下,对单面排水和双面排水条件下多层砂井地基的固结问题进行分析,推导出解析解,并对双层砂井地基的固结性状进行分析。结果表明,只有在各层土的压缩模量相同时,成层砂井地基按孔压定义的固结度才等于按变形定义的固结度,否则前者大于后者;当涂抹区水平渗透系数呈抛物线变化时地基固结最快,呈线性变化时次之,不变时最慢;施工扰动范围、程度越大,固结越慢;增大任何一层土的压缩系数,均可加快整个地基中的孔压消散。
Considering the three types of horizontal permeability coefficient of soil in the coating area, ie, the horizontal permeability coefficient is constant, linear change and parabola change, the consolidation of sandstone foundation under single-side drainage and double-side drainage is considered Analyze and deduce analytic solutions, and analyze the consolidation characters of double-layered sand well foundation. The results show that the degree of consolidation defined by pore pressure is equal to the degree of consolidation defined by deformation only if the compressive modulus of each layer of soil is the same, otherwise the former is greater than the latter. When the horizontal permeability coefficient When the parabola changes, the foundation consolidation is the fastest, the linear change is the second, and the slowest when the change is constant. The construction disturbance range, the greater the degree, the slower the consolidation; the increase of the compressibility of any soil can accelerate the whole The pore pressure in the foundation dissipated.