Abstract
Post grouting can improve the inherent defects such as the formation of the mud cake at pile side and the sediment at pile end in the process of bored pile construction. Thus post grouting has been widely used in Engineering. The purpose of this paper is to research the influences of post grouting to pile bearing capacity more systematically and intuitively. Combined with the static load test of four test piles in Weihe River Bridge test area of new airport highway in Xi’an, the bearing capacity and settlement of routine piles and post grouting piles are comparatively analyzed. The test results show that under the same geological condition, post grouting can improve the properties of pile tip and pile shaft soil of bored piles significantly, enhance the ultimate resistance, improve the ultimate bearing capacity and reduce the pile tip settlement. Then post grouting can aim to optimize pile foundation.
Highlights
2 INTRODUCTION TO THE TESTThe large bridge engineering has a high request to bridge pile foundation because the upper load is huge
This paper proves that post-grouting technology can increase ultimate bearing capacity of single pile and decrease settlement to reach a purpose of optimizing pile length, saving investment and reducing cost
Its value is adding with the increasing of depth, which shows that the difference of axial force of pile section and the pile shaft resistance are big
Summary
The large bridge engineering has a high request to bridge pile foundation because the upper load is huge. The construction technology of bored pile is mature and reliable currently It has been vastly used in large bridge engineering. It has some inherent disadvantages such as the existence of sediment at the hole bottom and pile lateral slurry cake, and they will decrease the bearing capacity of single pile through influencing pile tip resistance and pile shaft resistance in different degree. This paper proves that post-grouting technology can increase ultimate bearing capacity of single pile and decrease settlement to reach a purpose of optimizing pile length, saving investment and reducing cost. This paper analyzes the post-grouting technology’s influence to pile tip resistance, pile shaft resistance and ultimate bearing capacity by combing with four test piles’ static loading test of High-speed Weihe super large bridge of new airport highway in Xi’an
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