碎石桩桩身鼓胀变形测试技术研究  

A New Measuring Technique for Lateral Bulging of Stone Columns

作　　者：张玲[1] 赵明华[1] 罗宏[1] 

机构地区：[1]湖南大学岩土工程研究所,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2016年第3期149-154,共6页Journal of Hunan University:Natural Sciences

基　　金：国家高技术研究发展计划(863计划)资助项目(2006AA11Z104);国家自然科学基金(青年基金)资助项目(51208191);湖南大学青年教师成长计划资助项目~~

摘　　要：针对竖向荷载作用下碎石桩等散体材料桩桩身竖向压缩同时伴有侧向鼓胀变形这一特性,自行开发研制出量测桩身鼓胀变形的测试仪器,其原理是通过量测变形后的桩身周长来确定碎石桩的鼓胀量.通过与水玻璃胶结碎石桩量测其变形后周长等方法测试结果对比分析,验证碎石桩桩身鼓胀变形测试技术的可行性和测试精度.将该技术应用于室内模型试验中碎石桩鼓胀变形量的量测,测试结果表明,碎石桩鼓胀变形量随上部竖向荷载的增加而增加,同一荷载等级下鼓胀变形先随深度的增加而增加,后又随深度的增加而减小.It is known that axial compressive deformation is usually generated in a stone column under vertical loads, and often accompanied by a radial expansion against the surrounding soil near the top portion of the column. With the consideration of this deformation characteristic of the stone column, a new technique to measure the lateral bulging of the stone column was proposed, where the lateral bulging of the column was determined by circumferential measurements. The variability and accuracy of the proposed measuring technique was fully verified by the comparison with the other measuring methods. Moreover, this measuring technique was employed to study the deformation behavior of stone columns in an indoor laboratory test. The measuring results show that the lateral bulging of the stone column increases with the increase of vertical loads. Furthermore, under a certain load, the column bulging increases along with the column length firstly, then decreases with the column length after the maximum bulging.

关 键 词：模型试验 测试技术 碎石桩 鼓胀变形 

分 类 号：U416.1[交通运输工程—道路与铁道工程]