作　　者： ; ; (葛折圣）;

机构地区： 广州市市政园林局广东广州510001

出　　处： 《现代交通技术》 2005年第3期4-7,共4页

摘　　要： 通过土工离心模型试验,研究土工格栅加筋台背回填材料作用于台背土压力的分布状况、加筋体的沉降变形特性、筋材的应变和变形特征。经分析比较提出了加筋回填材料离心模型试验的测量方法,通过粘性土、加筋粘土、风积砂、加筋风积砂等几种材料的台背回填离心模型试验和研究,发现土工格栅的加筋作用对土压力和沉降变形的影响显著;回填体中加筋材料所在的位置越深,该层筋材的拉伸应变值越大;同一层筋材上,靠近回填体与相邻路堤接壤处发生的拉伸应变最大。结果表明:适当提高底层加筋材料的强度,增加锚固端加筋材料的长度,能明显提高回填体的整体稳定性,减少台背回填区表面的沉降变形。 By testing of centrifugal modeling, it researched distribution of soil pressure on abutment back and the settlement of backfill with geogrid reinforcement. Firstly, centrifugal modeling test measurement to highwaybridge abutment backfill with geogrid reinforcement was put forward. Then models with different backfill - material such as soil, reinforced soil, sand and reinforced sand were experimented. It is pointed that geogrid reinforcement affects distribution of soil pressure on abutment back and the settlement of backfill remarkably. In addition, the strain in the deepest geogrid is the biggest. In the same layer, the strain in the joint between backfill and roadbed is the biggest. Consequently, by strengthening the bottom layer geogrid and lengthening the anchored geogrid it evidently increased the stability of backfill soils and decrease the settlement of backfill surface.

关 键 词： 土工格栅加筋 回填材料 桥涵台背 土工离心模型试验 加筋材料 沉降变形 加筋风积砂 整体稳定性 分布状况 变形特性 变形特征 测量方法 分析比较 台背回填 加筋作用 拉伸应变 土压力 加筋体 粘性土 应变值 锚固端 回填区

领　　域： [交通运输工程] [建筑科学] [建筑科学]