PLANE-STRAIN CONSOLIDATION ANALYSIS OF DOUBLE-LAYERED GROUND WITH STRIP-SHAPED DISTRIBUTED DRAINAGE BOUNDARY

In the process of foundation treatment using the surcharge preloading method, the full surface arrangement of horizontal drainage channels is usually used to accelerate the consolidation of foundation soil. In order to use horizontal drainage channels economically and efficiently, the form of a strip-shaped distributed drainage channel is put forward, which changed the full surface arrangement to a distributed arrangement. Based on the plane-strain assumption, a two-dimensional consolidation model of double-layered ground under a distributed drainage boundary is established, and the corresponding semi-analytical solution is also obtained. Based on this solution, the effects of geometric parameters of a drainage channel and physical parameters of foundation soil on the consolidation with a distributed drainage boundary are summarized. The results show that a reasonable selection of geometric parameters of drainage channels can effectively reduce the waste of resources caused by excessive drainage channels, and achieve almost the same consolidation efficiency as the full surface arrangement of drainage channels at the later stage of consolidation. Moreover, the physical parameters of the underlying soil of double-layered ground have less influence on the consolidation efficiency than that of the upper soil. In engineering design, the physical and mechanical properties of upper soil should be given priority to reasonably select the geometric parameters of distributed drainage channels.