关键词: 加筋土挡墙, 不同面板形式, 结构特性, 地震

Abstract: Based on the reinforced retaining wall of Chengdu-Kunming railway, the field tests were carried out. The comparison of the reinforced retaining wall with full-height rigid panels, the reinforced retaining wall with modular panel embedded return package structure and the reinforced retaining wall with modular panel within 9 months after the completion of construction were analyzed to study the structural properties. During the test period, two earthquakes occurred and changes of the deformation of retaining wall and the earth pressure were monitored. The results show that the geogrid strain rate, wall compression and wall horizontal displacement can be well controlled by the reinforced retaining wall with full-height rigid panel, showing the best stability and seismic performance. The earth pressure on the back of the reinforced retaining wall with full-height rigid panel and reinforced retaining wall with modular panel are distributed following with a "M" type along the wall height. The distribution of earth pressure on the back of the reinforced retaining wall with modular panel embedded return package structure is similar to "S" along the wall height. The lateral earth pressure coefficients of the reinforced retaining wall with full-height rigid panel change little along the wall height, which are less than the FHWA calculated values. The lateral earth pressure coefficients of the reinforced retaining wall with modular panel embedded return package structure have an increased trend along the wall height. The values of the middle and lower part of the retaining wall are less than the FHWA calculated values, and the values of the upper part are close to or higher than the static earth pressure coefficients. Most of the lateral earth pressure coefficients of the reinforced retaining wall with modular panel are ranging from the FHWA calculation values to the static earth pressure coefficients. The geogrid strains of three retaining walls change nonlinearly along the wall height. The retaining wall compressions increase gradually with the increased time, especially in the first 50 days. Then the increase rates gradually decrease until the coming of the rainy season, the hydraulic effect promotes the increase rates to increase again. After the earthquakes, the earth pressure on the back decreases, the geogrid strain increases, the wall compressions increase and the wall panels have an obvious trend to move out.

Key words: reinforced retaining wall, different panels, structural property, earthquake