堤坝形毛竹土钉排桩基坑支护研究

提出了一种新型的软土基坑支护方法即"堤坝形毛竹土钉排桩基坑支护"。该方法主要是以节能环保型的竹材取代传统高耗能的钢质钉材,以毛竹为基坑侧壁支护排桩,以堤坝形土钉墙替代传统的各排土钉等长或上长下短布置。通过对毛竹力学性能的分析、现场抗拔试验、工程实践及数值模拟,验证该堤坝形毛竹土钉排桩基坑支护理念是正确的,表明毛竹在注浆过程中起到诱导作用可使注浆效果更好、能加深土钉在软土基坑的适用深度、可提高基坑支护的安全系数。

Dam Shaped Bamboo Soil Nails and Soldier Piles as Supports for Deep Excavations

This paper presents an innovative deep excavation support system ＂dam shaped bamboo soil nails and soldier pilesfor the excavation support＂. This method is replacing the high energy consumption steel reinforcement bars with environmentfriendly bamboo bars. The bamboo bars can also be used as soldiers in supporting the excavations. The dam shaped bamboo soiInail distribution can be used to replace the conventional soil nails with equal nail length or longer nails at top with shorter nailsat bottom. The stress-strain analysis on bamboo bars, the in-situ pull out tests and numerical analysis have been performed. Itis concluded that the application of the bamboo bars in the deep excavation support is appropriate. The bamboo bar can alsoserve as a casing to guide the grout slurries to the greater depth of the nail; therefore, safety factors of the excavation supporting system can be enhanced.