土工管袋填充土体固结过程的离心模拟试验

Centrifugal Model Tests of Consolidation Process of the Filled Soil in Geotextile Tubes

摘要: 基于离心模型试验，本文模拟了土工管袋内填充土体的固结过程。通过监测管袋高度以及袋内土体中的孔隙水压力、土压力的变化过程，探究了土工管袋土体的固结特性。离心试验结果与静力(重力加速度)条件下固结试验具有一致性，且试验结果表明：管袋充填土体中部孔压的消散速度要比底部要慢，且最终消散值比底部要小；袋底处的土压力随着排水增加、管袋高度降低而逐渐减小，其垂直土压力减小值比水平土压力大。

Abstract: The consolidation process of the filled soil in geotextile tube was modeled by carrying out centrif-ugal model tests in this paper. The changing process of the geotextile tube height, the pore water pressure and soil stress within the tube was monitored during the centrifuge tests to study the soil consolidation characteristics. The results of centrifugal tests agree well with the test under statical (gravity) condition. The results show that: the pore pressure in the upper part of the soil-filled tube dissipates more slowly than the bottom part and the pressure change is much smaller; the soil stress at the bottom of the tube decreases gradually with the increase of drainage and the decrease of the tube height, and the change of vertical soil stress is larger than that of horizontal soil stress.