加筋路基处治不均匀沉降模型试验研究

通过室内小比例模型试验，模拟高速公路过渡段施工中经常采用的土工格栅加筋路基，研究土工格栅加筋结构能否有效控制高速公路过渡段的不均匀沉降。试验共设计了不铺设土工格栅、铺设1层土工格栅在路基上、中、下位置、铺设2层土工格栅在路基上中、中下、上下位置铺设，以及铺设3层土工格栅上中下位置，共8种工况，分析各种土工格栅加筋方案中路基的不均匀沉降和土工格栅的受力特性。试验结果表明，土工格栅加筋路基可明显调节过渡段的不均匀沉降，在路基的中部和上部铺设2层土工格栅的加筋效果最佳。

Effect of reinforced subgrade on differential settlement by model test research

The small scale model tests are designed to simulate the geogrid-reinforced subgrade adopted by highway construction to mitigate the differential settlements of differently treated foundations. Eight geogrid-reinforced subgrade models are studied, which include not putting geogrids, putting one layer of geogrids respectively in the bottom, the middle and the top of the subgrade, putting two layers of geogrids in the bottom and the middle, the bottom and the top, the middle and the top, and putting three layers of geogrids in the bottom, the middle and the top. The differential settlement of the model subgrade and the mechanical characteristics of geogrids are modeled to evaluate the effect of the geogrids reinforcement. The results of the tests prove that the geogrids reinforcement decreases the differential settlement of subgrade effectively; and putting two layers of geogrids in the middle and the top of the subgrade is the best reinforcement design.