土工袋加固砂性土质边坡模型试验与上限解

MODEL TEST OF SANDY SOIL SLOPE REINFORCED BY SOILBAGS AND UPPER-BOUND SOLUTION

通过模型试验比较有土工袋加固和无土工袋加固时边坡的破坏形态及承载力,验证土工袋对边坡的加固效果,并基于试验结果建立边坡的许可破坏模式及其速度场,利用极限分析上限法求解了边坡的极限高度上限解,利用模型试验结果对边坡极限高度进行验证。试验及计算结果均表明:边坡越陡,有土工袋加固较无土工袋加固时边坡的极限高度和承载力提高越大,表明土工袋加固效果越好。试验结果与计算结果基本吻合,表明该计算方法的可信性,可为边坡的稳定性设计问题提供理论依据。

A series of model tests are carried out on sandy soil slopes with and without reinforcement by soilbags.The reinforcement effect of soilbag is validated by comparing the slope failure modes and ultimate bearing capacities.Based on the test results,an allowable slope failure mode and the velocity field are established.Meanwhile,the ultimate failure heights of the reinforced slopes are obtained by using the upper-bound solution theory,which agrees well with those from the model tests.Both the model tests and the upper-bound calculations show that,after reinforcement with soilbags,the steeper the soil slope is,the more the increases of the ultimate failure height and the bearing capacity of the soil slope are,indicating a better reinforcement effect of soilbags.