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In-situ Friction Testing for Estimating the Bearing Capacity of Friction Piles

用于估算摩擦桩承载力的原位摩擦试验

基本信息

批准号：
01460192
负责人：
KISHIDA Hideaki
金额：
$ 2.69万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01460192/
关键词：
Friction Pile Bearing Capacity In-situ Test

项目摘要

Experimental tests were carried out to study the possibility of estimating the frictional factor of the bearing capacity of piles with the use of a Lateral-stress-sensing cone penetrometer.1. The characteristics of lateral stress acting of the cone penetrometer in sandy soil were examined with the results of the friction tests in pressurized artificial grounds and inーsitu tests at reclaimed grounds.The change of horizontal stress was measured during the penetration of the cone penetrometer into the pressurized artificial ground. The relative density of the sand was found to be influential to the lateral stress acting on the friction sleeve. The results of in-situ tests at reclaimed sandy grounds showed that the location of the pore water pressure transducer has an important role on the test results.In-situ friction tests were carried out at soft and stiff clayey grounds, Frictional resistance from the cone penetration tests were studied in comparison with the frictional resistance from the loading tests of piles.From the test results in the soft clayey ground, it was found that neither the location nor the roughness of friction sleeve has evident influence on the frictional resistance measured by the cone penetrometer. From the test results in the stiff clayey ground, it was found that the frictional resistance measured by friction sleeve is closer to the frictional resistance from the loading tests of piles than the value estimated from the point resistance of the cone penetrometer.3. Problems were identified on the apparatus and procedure of the in-situ tests by the lateral-stress-sensing cone penetrometer. It will become necessary to solve these problems to establish a concrete method for estimating the frictional resistance of piles from the results of cone penetration tests.

通过试验研究了利用侧向应力感应锥贯仪估算桩承载力摩擦系数的可能性。通过人工压力场地摩擦试验和填海场地现场试验，研究了锥形贯入仪在砂土中的侧向应力特性。测量了锥形贯深仪在进入加压人工地面过程中水平应力的变化。发现砂的相对密度对作用在摩擦套上的侧向应力有影响。在填土砂土地基上进行的现场试验结果表明，孔隙水压力传感器的位置对试验结果有重要影响。在软、硬粘土地基上进行了原位摩擦试验，对比研究了锥贯入试验和桩荷载试验的摩擦阻力。从软粘土地基的试验结果来看，摩擦套的位置和粗糙度对锥贯仪测得的摩擦阻力均无明显影响。2 .从刚性粘土地基的试验结果来看，摩擦套测得的摩阻力值比锥贯仪测得的点阻力值更接近桩荷载试验的摩阻力值。指出了侧向应力传感锥贯仪原位试验在设备和程序上存在的问题。为了解决这些问题，有必要建立一种由锥贯试验结果估算桩的摩阻力的具体方法。