《Journal of Geotechnical and Geoenvironmental Engineering》杂志刊登“有位移量测装置的桩在无钙质胶结砂土中桩侧摩阻力”

作者：Barry M. Lehane; James A. Schneider; Jit Kheng Lim; and Giuseppe Mortara
刊物：《Journal of Geotechnical and Geoenvironmental Engineering》，2012年11月，138卷第11期，1357–1368页
关键词：钙质砂；桩；循环
摘要：本文利用安装有同时记录桩身特定位置处径向应力和剪应力的传感器的桩在无钙质胶结砂中的特性。结合相邻的自钻式旁压试验数据以及在重塑土样中进行的单剪和循环直剪接触面试验数据对试验进行了分析，证实了桩身上有非常小的径向应力的存在。虽然剪切过程中的剪胀可认为抵消了低径向应力，但短期桩身承载力仍要比硅质砂中相同桩的承载力低很多。通过对试验的进一步观察可知：粘结或焊接的桩身外壳的形式是影响破坏形式的主要因素，不同安装形式决定其破坏发生在砂-砂界面或砂-钢界面，并且在单调加载过程中可引起更大的剪胀。然而，焊接的砂外壳则不能提高长期循环承载力。

Shaft Friction from Instrumented Displacement Piles in an Uncemented Calcareous Sand

Authors: Barry M. Lehane; James A. Schneider; Jit Kheng Lim; and Giuseppe Mortara
Journal: Journal of Geotechnical and Geoenvironmental Engineering, Volume 138, Issue 11 (November 2012), 1357–1368
Key words: Calcareous sand;pile;cyclic
Abstract: The behavior of displacement piles in uncemented calcareous sand is investigated using field piles instrumented with a sensor that simultaneously records the radial stress and shear stress at specific locations on the pile shafts. These tests are interpreted with the assistance of data from adjacent self-boring pressuremeter tests and from monotonic and cyclic direct shear interface tests performed on reconstituted samples. The existence of extremely low radial stresses on the pile shafts is verified. Although dilation during shear is seen to compensate for such low radial stresses, short-term shaft capacities are much lower than capacities of equivalent piles in siliceous sands. The development of a bonded or welded crust to the pile shaft was seen to be the primary contributor to the setup observed at the test site; this crust forced failure to take place at a sand-sand rather than a sand-steel interface and also gave rise to higher levels of dilation during monotonic loading. The welded sand crust did not, however, give rise to a higher long-term cyclic capacity.

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000712
翻译：孙庆雷；审核：安鹏