土工管袋充填过程模拟与固结试验

土工管袋技术在滩涂围垦、河海岸保护及港口建设等领域应用广泛,并在模袋承载力、袋体张力、填料、渗透排水研究等方面取得丰富的成果,但其填土固结全过程分析及固结规律远未得到充分认识。为此,开展管袋模型试验,全方位监测充填过程中孔压与土压力演变规律。结果表明:1)袋内孔压、土压在充填与消散交替进行中表现为交替的变化过程。袋内水平土压力系数上部与下部不同,上部接近主动土压力系数,底部接近静止土压力系数。2)充填初期,袋底孔压最大,距离透水的土工布边界越近,其消散越快。此外,中部孔压一直最大,上部次之,底部最小。3)充填期管袋的高度与中部孔压呈紧密的正相关关系。

Simulation of filling process and consolidation test of geotextile tubes

Geotextile tubes are widely used in the fields of shore reclamation,protection of river bank and coast and port construction.Some experimental tests of geotextile tubes are conducted to investigate the bearing capacity of geotextile tubes,the tension of geotextile tubes,filing materials,as well as permeability and drainage,but the whole process analysis of filling consolidation and the consolidation laws of the geotextile tubes are not recognized.A model of geotextile tube is designed to monitor the pore pressure and soil pressure in the whole filling process. The results show that:1)the pore pressure and soil pressure alternate with the change of the filling and dissipation.The upper and lower horizontal earth pressure coefficients are different,the former is close to the active earth pressure coefficient,the latter is close to the coefficient of earth pressure at rest. 2)In the early stage of filling,the pore pressure of the bottom of geotextile tube is the largest,and the closer the boundary is,the faster it dissipates.In addition,the pore pressure of the center is always the largest,the upper is secondary,while the bottom is the smallest. 3)In the filling period the height of geotextile tubes is closely related to the central pore pressure.