自平衡法后注浆灌注桩变形特性研究

Study on the Bearing Capacity of Bored Pile with Dry Hole of Brouting Rotary Drilling Rig Based on Self Balanced Method

以贵州喀斯特地区某高层中桩基础为工程依据,进行了2根后注浆旋挖钻钻机干法成孔灌注桩自平衡静载试验。通过对某工地6根灌注桩进行试验,并进行分析后发现,在喀斯特地区采用旋挖桩成孔工艺进行的灌柱桩,进行后注浆后其承载力有所提高,抵抗变形能力显著改善。

Based on the project of a high level middle pile foundation in Karst area of Guizhou,the self balance static load test of dry hole filling pile of post grouting rotary drilling rig is carried out. Through collecting and arranging the test data,the paper discusses the vertical load bearing characteristics of the rotary drilling drilling machine in Karst. The results show that the bearing capacity of bored pile is improved by grouting on pile side.