双向土工格栅与黏土界面作用特性试验研究

Test study on interaction characteristics between two-way geogrids and clay

在加筋土工程中加筋与填土间的界面作用特性是最关键的技术指标,直接决定该工程的稳定性。室内拉拔试验结果表明,双向土工格栅与黏土界面的表观摩擦阻力随法向应力的增加而增加;在较低的法向应力作用下,双向土工格栅与黏土界面间的破坏形式为土工格栅的整体拔出破坏;当法向应力增加到一定值后,双向土工格栅与黏土界面间的破坏形式由土工格栅的整体拔出破坏转变为土工格栅的纵肋拔出破坏;双向土工格栅整体拔出破坏时,表观黏着力小于纵肋拔出破坏时的表观黏着力,而表观摩擦角则相反。

The interaction characteristics between reinforcements and soil are the key index in reinforced earth, which determines the stability of reinforced earth. Pullout test results show that the quantity of apparent frictional resistance between two-way geogrids and clay increases with the normal stress increasing. The failure format between two-way geogrids and clay is the entirety two-way geogrids pulled out when the normal stress is lower, but as long as the normal stress is higher than some certain quantity, the failure format between two-way geogrids and clay is changed from entirety pulled out to longitudinal gill pulled out. The apparent cohesion of entirety pulled out failure format is less than that of longitudinal gill pulled out failure format; and the apparent friction angle is reverse.