影响区形状对砂井地基固结性状的影响

EFFECTS OF THE SHAPE OF INFLUENCE ZONE ON THE CONSOLIDATION BEHAVIOR OF SAND-DRAINED GROUND

为研究现有砂井固结解析理论中将砂井多边形影响区简化为圆形所带来的影响,考虑了影响区为正六边形的梅花形布置砂井的两种计算模型,即将砂井及其涂抹区假定为正六边形的模式1和考虑真实砂井横截面的模式2。根据等应变假定和Carrillo定理分别得到固结基本方程,引入边界和初始条件,结合现有理论结果,给出了两种模式下平均超静孔压和地基总平均固结度的解答。分析了3个无量纲参数对固结性状的影响,结果表明,两种模式得到的固结曲线呈现的规律一致。最后与现有理论进行对比,发现相同条件下模式1计算的固结度最大,而模式2的解答与现有理论结果十分接近。

In order to study the effects of actual influence zone of a vertical drain on the consolidation behavior, two types of research models for a fully penetrating drain well with a regular hexagon boundary are considered, including pattern one in which the drain well is assumed to be hexagonal and pattern two reflecting the actual cross-section of the soil-drain system. The basic equations describing the consolidation are derived from the equal strain assumption and Carrillo theorem. Under initial and boundary conditions, the corresponding solutions for the average excess pore pressure and the total average consolidation degree of two patterns are obtained. The influences of three dimensionless parameters on the consolidation behavior are analyzed. The results show that the curves of both patterns present an identical law. Finally, the available solutions are compared with the existing analytical solutions. It can be concluded that, under the same conditions, the consolidation degree calculated by pattern one is the biggest and the solution of pattern two is very close to the existing one.