复合加筋排水褥垫加固路基有限元计算

复合加筋排水褥垫是针对沿海缺砂地区开发的,具有水平排水与加筋作用的一项新型专利技术,可取代软基加固中的排水砂垫层.采用二维平面应变Biot固结有限元模型对复合加筋排水褥垫软土路堤进行了数值模拟,结果表明复合加筋排水褥垫可以满足水平排水要求,另外与传统的水平排水砂垫层相比,该技术可降低地基附加正应力和超孔隙水压力,有效抑制路基侧向变形的发展,减小路基沉降与不均匀沉降,提高路基稳定性,加筋效果显著.

2-D Biot consolidation FEM Analysis of subgrade improved by combined drainage and reinforcement cushion

The combined drainage and reinforcement cushion (CDRC) is a newly-developed proprietary technology which aims at coastal areas short of sand, is used for horizontal drainage and reinforcement in soft ground treatment and can replace horizontal dewatering sand cushion. The behavior of subgrade improved by CDRC has been analyzed by 2-D Biot consolidation plane strain finite element method. The result shows that the drainage capacity of CDRC can meet the requirement for drainage. Besides, it also shows that the technique can applied to lower foundation additional normal stress and excess pore water pressure, restrain the lateral deformation of foundation effectively, decrease vertical settlement and differential settlement of soft foundation and improve the foundation stability with remarkable effect compared with the traditional horizontal dewatering sand cushion.