深层平板试验和单桩竖向抗压静载试验的对比分析  

Comparative Analysis on the Deep Plate Test and Single Pile Vertical Compressive Static Load Test

作　　者：江小兵 吴红兵 张浩博[2] 

机构地区：[1]中国有色金属工业西安勘察设计研究院,陕西西安710054 [2]西安理工大学土木建筑工程学院,陕西西安710048

出　　处：《探矿工程（岩土钻掘工程）》2018年第1期84-88,共5页Exploration Engineering:Rock & Soil Drilling and Tunneling

摘　　要：根据Mindlin理论弹性位移解,结合有限元算例,分析了在同等荷载工作条件下深层平板和单桩竖向抗压静载试验的竖向位移差异。深层平板与单桩竖向抗压静载试验产生的竖向位移的比值,随着桩径的增大而减小,在常规桩径0.8~2.0 m范围内,两者的比值为3.2~4.6倍。工程实例发现,两者的比值可达4.5~7.2倍。因此,深层平板载荷试验不能充分挖掘单桩竖向受力潜能,其试验结果不能真实反应单桩竖向受力性能,不应采用深层平板载荷试验确定桩端承载力,而应采用单桩竖向抗压静载试验确定承载力。Based on the Mindlin elastic displacement solution and combined with finite element numerical example,the analysis is made on the vertical deformation difference of deep plate test and single pile vertical compressive static load test under the same load condition.The ratio of vertical displacement resulted from these 2 tests decreases with the increase of pile diameter,and the ratio is 3.2~4.6 while the conventional pile diameters are within the range of 0.8~2.0 m.The engineering example shows that the ratio of the both can be 4.5~7.2 times.Therefore,single pile vertical load-bearing potential can not be fully exploited in the deep plate loading test and the test results can not truly reflect the single pile vertical load-bearing performance.The bearing capacity of pile tip should be determined by single pile vertical compressive static load test rather than deep plate loading test.

关 键 词：MINDLIN位移解 深层平板载荷试验 单桩竖向抗压静载试验 竖向位移 有限元计算 对比分析 

分 类 号：TU443[建筑科学—岩土工程]