同一场地不同持力层桩基静载试验对比分析

The comparison analysis on pile static load test of same site different bearing layer

通过收集杭州某工程静载试验数据,分析了不同方案中试桩的极限承载力及桩顶桩端沉降,经比较,持力层为中风化基岩的试桩单桩竖向极限承载力与持力层圆砾层桩端后注浆的试桩单桩竖向极限承载力相差不大,桩顶沉降量亦相差不大,但桩长上圆砾持力层注浆试桩则要减少10 m～15 m,节省20%～30%,可优选圆砾持力层结合桩端注浆的设计方案。

Through the collection of static load test data of a project in Hangzhou,this paper analyzed the test pile ultimate bearing capacity and pile top pile end settlement of different scheme,the test pile single pile vertical ultimate bearing with mid-weathered bedrock bearing layer of difference small to test pile single pile vertical ultimate bearing with bearing layer,pile end post-grouting,the pile top settlement was also similar,but the pile length reduced 10 m～15 m of gravel layer bearing layer grouting test pile,saved 20% ～30%,preferred the design scheme combining with gravel bearing layer and pile end grouting.