毛乌素沙漠风积砂地层碎石桩载荷试验研究

STATIC LOADING TESTS ON VIBRATING GRAVEL PILE FOUNDATION IN MU US DESERT

在榆林地区典型风积砂地层中开展了碎石桩复合地基载荷试验,通过试验对碎石桩有效桩长及承载力等方面进行了探索性研究。通过试验得到天然地基临塑荷载为128kPa,极限荷载320kPa;碎石桩单桩临塑荷载为1019.2kPa,极限荷载不小于3312.4kPa;桩间土临塑荷载为318kPa,极限荷载1590kPa;复合地基临塑荷载为535kPa,极限荷载不小于2072kPa;除此之外,在本文试验条件下,碎石桩的有效桩长可达8m左右,但上部荷载则主要由4m以上桩体承担。本文的有关结论为该区振冲砂桩复合地基的设计和施工提供了十分重要的参考依据。

This paper presents the field static loading tests on Vibrating Gravel Pile Foundation in Mu Us Desert.The effective length of the gravel pile and the bearing capacity of the Vibrating Gravel Pile Foundation are studied.The test results show that the critical loads of the natural base,gravel pile,soil between piles and the compound foundation are 128 kPa,1019.2 kPa,318 kPa,and 535 kPa,and the limit loads of the natural base and the soil between piles are 320 kPa and 318 kPa respectively.The limit loads of the gravel pile and the compound foundation are more than 3312.4 kPa and 2072 kPa respectively.The results also show that although the effective length of the gravel pile reaches 8m,the loads are supported mainly by the upper 4m of the gravel pile.The work of this paper makes great significance to practice of the gravel Pile Foundation in the Mu Us Desert.