土工织物加固土质坝堤加高工程的离心模型试验研究  

Centrifugal model tests on geotextile-reinforced heightening projects of soil embankments

作　　者：李笑琳 张嘎[1] LI Xiaolin;ZHANG Ga(Department of Hydraulic Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《岩土工程学报》2024年第S01期112-116,共5页Chinese Journal of Geotechnical Engineering

基　　金：北京市自然科学基金项目(QY23148)。

摘　　要：土工织物是一种广泛用于边坡加固的合成材料,但土工织物在土质坝堤加高工程中尚未得到合理应用。针对水位变动条件下土工织物加固的加高土质坝堤进行了离心模型试验,观测了加高坝堤的变形破坏响应过程。试验结果表明,土工织物加固的加高土质坝堤的破坏呈现出新旧坝堤各异的特点,新旧坝堤呈现出不同的破坏特性,离土工织物较远的旧坝堤先发生破坏,土工织物加固的新坝堤的破坏发生较晚,且呈现从上到下渐进发展的特性;加高坝堤的最终破坏是由变形局部化和局部破坏相互耦合渐进发展导致的;土工织物分为加固段和约束段,在约束段坝堤给土工织物提供约束力,在加固段土工织物限制了坝堤的变形,土工织物的加固机理是将坝堤深部的约束力传递到坝堤表面,从而增强了坝堤浅层的抗滑能力;水位变动引起坝堤的变形增加,土工织物的加固作用也随之增强。Geotextiles are widely used to reinforce slopes,but they have not yet been effectively applied in heightening projects of soil embankments.The centrifugal model tests are conducted on the elevated soil embankments with geotextile reinforcement under variation of water level.The deformation and failure process of the reinforced embankment are observed and measured.The results indicate that the failure of the elevated soil embankments with geotextile reinforcement exhibits different characteristics between the new and old embankments.The ultimate failure of the elevated embankment is caused by the coupling and progressive development of deformation localization and local failure.The geotextiles are divided into reinforcement section and restraint section.In the restraint section,the embankment provides restraint for the geotextiles,while in the reinforcement section,the geotextiles limit the deformation of the embankment.The reinforcement mechanism of the geotextiles is to transfer the restraint from the deep part of the embankment to its surface,thereby to increase the sliding resistance of the shallow layer of the embankment.

关 键 词：坝堤 加高 土工织物 离心模型试验 水位变动 

分 类 号：TV22[水利工程—水工结构工程]