大直径灌注桩高应变和静载试验对比分析  

Contrastive analysis between high-strain dynamic test and static load test for large-diameter cast-in-place piles

作　　者：张雄水 

机构地区：[1]福建省建筑科学研究院,福州350025 [2]福建省绿色建筑技术重点实验室,福州350025

出　　处：《工程勘察》2016年第3期75-78,共4页Geotechnical Investigation & Surveying

摘　　要：根据高应变法在大直径灌注桩上单桩承载力的检测结果,将实测曲线分为三种类别,采用静载试验分别对不同类别的桩进行承载力验证。三组对比结果表明,高应变法的检测结果中最佳波形拟合法检测精度相对高一些,对于嵌入基岩的灌注桩,高应变法可以达到甚至超过静载试验的检测效果,对于静载试验的Q-s曲线具有缓变型特征的大直径灌注桩,高应变法检测结果存在一定误差,但在有充分的动静试验对比资料的条件下,合理地调整拟合参数,可以作为大直径灌注桩承载力验收时静载试验的补充。According to the results from the high-strain dynamic test for the large-diameter cast-in-place piles,the curves measured by high-strain dynamic tests are divided to three categories. Then the static load tests are used to verify the pile bearing capacity of different categories respectively. The contrastive results of three groups show that the satisfactory curve match of high-strain method is relatively more precise. The efficacy of high-strain dynamic test can reach or even exceed that of static load test for rocksocketed cast-in-place piles. Compared with static load test,there is some error in high-strain dynamic test for large-diameter cast-in-place piles whose Q-s curves are changed slowly. When the comparison data from the dynamic and static methods are well collected,the parameters should be reasonably adjusted,and high-strain dynamic test can be used as an effective supplement of the static load test on large-diameter cast-in-place piles.

关 键 词：高应变法 波形拟合法 嵌岩灌注桩 缓变型Q-s曲线 

分 类 号：TU473.16[建筑科学—结构工程]