粗粒料试验中界面摩阻力的试验研究

土工试验中界面摩阻力的存在对试验成果的影响不可忽视,摩阻力影响到试验成果的可靠性,摩阻力的大小和减小摩阻力的措施是普遍关心的问题。目前,还没有一种很好的试验方法直接测定土体材料与加载结构(钢结构)间的摩阻力,并研究减小摩阻力的措施。为此,专门设计了一种试验设备,并针对粗粒料进行了系统的试验,探讨了界面摩阻力的试验方法、粗粒料界面摩阻力大小和某种减小摩阻力措施的有效性。试验表明,粗粒料与加载结构间的摩阻力与正应力成正比,摩擦系数达0.45左右,经一定"减摩"措施处理后,摩擦系数可降至0.1左右,要更大程度上消除摩阻力是一件非常困难的事。因此,在土工试验设备设计及试验成果整理中有必要考虑界面摩阻力这一影响因素。

Experimental research on interface friction in granular materials

The influence of interface friction on the soil tests can’t be neglected,and its value has certain effects on the reliability of the test results,so the magnitude of its value and the measures become the universal issue.At present,there isn’t any kind of good test method to measure the friction between samples and the load structures(steel structures) and to study the measures.A kind of test equipment is developed,and designed systematic tests on granular materials are carried out.The test method of interface friction,the frictional values of granular materials,and the validity of measures are discussed.The tests indicate that there is an proportional relationship between the friction and the normal pressure.The friction coefficient reaches about 0.45.After certain measures are taken,it may fall to 0.1.It’s extremely difficult to eliminate the fiction in a greater degree.Therefore,the interface friction should be considered in the design of the soil tests and in the analysis of the test results.