低填方软土路基中土工格栅的作用特征

Reinforcement Effects and Mechanical Characteristics of Geogrid on Low-filled Soft Soil Subgrade of Pavement

为了解低填方软土路基中土工格栅对地基变形的影响,在广州市东新高速公路试验段进行了现场试验。试验路段内填方高度均在3m以下,分别进行了天然地基快速填筑试验、天然地基结合土工格栅加筋及袋装砂井处理地基结合土工格栅加筋等试验,通过对地基变形、土工格栅受力的监测,获得基础参数,进一步分析低填方条件下土工格栅在地基变形、受力特征等方面的作用特征。本文是该段试验成果的一部分,对于超软地基低路堤的设计和施工都有一定借鉴意义。

In order to investigate the influence of geogrid on the deformation of low-filled soft soil subgrade, a field test was carried out on the experimental pavement sections on Dongxin freeway which is located in Guangzhou. The heights of the embankments on the soft soil subgrades were less than 3 m. A series of short-time filling and compaction tests were conducted relatively on natural base courses, natural base courses with geogrid reinforced and packaged vertical sand drain processed base with geogrid reinforced. By means of monitoring the deformations of the subgrades induced by external loads, related fundamental parameters were obtained to further investigate the reinforcement effects and characteristics of geogrid on reducing the deformations and improving the bearing capacity of the subgrades. This study is a partial achievement of the researches on this experimental pavement sections, and it provides significant reference value and experiences for the design and construction of low-filled soft soil subgrade.