土工合成加筋材料与自嵌式砌块摩擦特性试验研究

Study on the friction characteristic of geosynthetic reinforcement and interlock blocks

在自嵌式砌块加筋挡土墙工程中,加筋材料与自嵌式混凝土砌块间的连接强度是决定该工程的内部稳定性的关键指标。通过室内拉拔试验,得出了当法向应力p<40kPa和p>40kPa时,摩擦阻力与拉拔位移的关系曲线;同时得出了丙纶长丝机织土工布与混凝土砌块界面间的摩擦强度及法向应力的关系曲线,这一成果对同类项目设计具有很好的参考价值。

The connection strength of reinforcement materials and interlock concrete blocks is the key index of interlock segmental reinforced retaining walls, and determines the internal stability of the engineering. It is found that the friction strength of the two-way geogrids and blocks increases with the increase of the normal stress when the normal stress is less than 40 kPa from the results of pullout test, and the two-way geogrids would be pulled out from blocks and be failure. The friction strength is invariable and the two-way geogrids would be tension fracture at the contact point of blocks trailing edge when the normal stress is over 40 kPa. The friction strength of the polypropylene filament woven geotextile and concrete blocks increases with the increase of the normal stress, and the geotextile would be pulled out and be failure. The connection strength of the polypropylene filament woven geotextile and concrete blocks is more than that of the two-way geogrids and concrete blocks.