土工合成材料对路基粉质粘土CBR提升效果研究

Study on CBR Enhancement Effect of Subgrade Silty Clay Reinforced with Geosynthetic Layers

通过CBR试验对土工合成材料加固路基粉质粘土的效果进行了研究,探讨了土工合成材料类型和层数对CBR的影响,获取了各种材料加固的最佳位置。结果表明,土工合成材料可以有效提高粉质粘土的CBR,当采用单层土工合成材料加固时,CBR增加5%~60%,当用双层土工合成材料加固时,CBR增加112%~325%,增加量取决于土工格栅设置的位置和类型;为获得最大的CBR提升效果,塑料土工格栅网格加固应放置在试样的0.3H^0.36H之间,而对于玻纤土工格栅和土工网,最佳加固位置位于0.41H^0.62H之间。

The effects of geosynthetic materials on subgrade silty clay reinforcement were studied by CBR tests,and the influence of the types and layers of geosynthetic materials on CBR was discussed.The optimal reinforcement positions of different geosynthetic materials were acquired.The results show that geosynthetic materials can effectively improve the CBR of silty clay.In general,CBR will increase 5%~60%under single-layer reinforcement condition,while CBR will increase 112%~325%under double-layer reinforcement condition.The increase amount depends on reinforcement position and geosynthetic material type.In order to achieve the maximum CBR improving effect,the reinforcement of the plastic geogrid should be placed between 0.3 H and 0.36 H of the specimen.For glasgrid and geonet,the optimum reinforcement position is between 0.41H^0.62H.