饱和砂土振动液化试验研究

A STUDY OF THE LIQUEFACTION OF SATURATED SAND DURING CYCLIC LOADING

六十年代以来,国内外地震活动十分频繁,特别由地震引起土工建筑物和地基的振动液化问题,对工程建筑物的危害尤为严重。为了预报和预防地震引起的灾害,迫切需要加强对振动液化试验的研究。 目前,振动三轴仪是室内研究振动液化的主要仪器设备。按施加振动力的激振方式有惯性力式、电磁式,气动式和电液式等。由于仪器设备的不同,对同一种土的试验结果能有多大影响,各种因素的影响如何?振动液化的机理应如何理解,单向与双向试验结果差别有多大?是值得探讨的问题。这对修订统一的振动液化试验操作规程,了解试验因素的影响及探讨振动液化的机理等具有重要实际意义。

The soil liquefaction arising in earth quake has teen deserved more attention no-waclaysnUsing a dynamic triaxial apparatus.To perform the liquefying test is generally recommande.Here we used the S-l-D electro-hydraulic double dynamic triaxial test apparatus in conducting the liquefying test of standard sand. In this paper, the method of sample preparation, the criterionof the liquefaction of saturated sand, the effects of Various density and consolidation ratio, the comparison of the liquefaction between single-action and double-action cyclic triaxial test are discussed. Mean while, the mechanism of liquefaction of sand under vibrating condition is explorated. These results are very important in testifying the effect iveness of the apparatus and in studying the influences of the test conditions, the mechanism and failure criteria of saturated sand in liquefaction. The authors try to deliver their opinion on these problems in this paper, in order to facilitate further study.