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

实验性测试已被运送到研究是否有可能估计其承载能力的Frictional factor，其使用后压力传感圆锥形测仪。The characteristics of the cone penetrometer in sandy soil were examined with the results of the friction tests in pressurized artificial grounds and in-situ tests at reclaimed grounds。The change of horizontal stress was measured during the penetration of the cone penetrometer into the pressurized artificial ground。“沙子的相对密度已经被发现对裂缝睡眠的深层压力行为具有影响力。”在回收的沙地场进行的现场测试的结果显示，港口水压力转换器的位置在测试结果上有一个重要的作用。现场Frictional Tests在软和硬粘土场进行了测试，从圆锥渗透测试在比较中进行了比较，从加载测试的Frictional Resistance从软粘土场进行了测试，从软粘土场进行了比较，从软粘土场进行了测试的Frictional Resistance。这是发现的，因为它不是一个位置，也不是一个粗糙的Friction Sleeve对圆锥形渗透仪测量的Frictional Resistance有明显的影响。从硬克莱地面的测试结果中，通过Friction Sleeve发现了对Friction-Resistance进行测量的Friction-Resistance比从圆锥形渗透仪的负载测试的负载更接近于从该点的抵抗力的价值估计。通过lateral-stress-sensing锥体渗透仪确定的设备和现场测试的程序。It will be be necessary to solve these problems to estimating the frictional resistance of piles from the results of cone penetration tests的具体方法。

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.