作　　者： ; ;

机构地区： 长安大学公路学院

出　　处： 《西安建筑科技大学学报（自然科学版）》 2013年第1期58-65,85,共9页

摘　　要： 为了明晰在较高的离心力场中,离心加速度及模型高度的变化对饱和土体固结理论适用性影响,提高离心力场中试验结果的可靠性,依据常规固结试验仪,研制了离心力场下的固结试验装置,并以此为基础,针对饱和砂土、典型海相土及河相土进行了不同离心力场下的固结模拟试验研究,同时对其试验时间与不同理论计算时间进行对比分析.结果表明,离心机模拟土体固结沉降时,离心加速度越大对总沉降量的影响也越大;在离心力场下,Terzaghi一维固结理论的应用有一定的局限性;不均匀离心力场和较高的模型高度对饱和土固结试验结果的影响较大,土体自重应予以考虑;现有离心模型试验的时间比尺应根据试验条件进行修正. In order to research the impact of centrifugal model test results from the change of acceleration and the model height and improve the accuracy of centrifuge test results, based on conventional consolidation test instrument, The con- solidation test device in centrifugal force field was developed. Taking the consolidation simulation of saturated sand, ma- rine soil and saturated loess in different centrifugal acceleration field as subject, the comparison of test time and different theoretical computation time were analyzed. It is indicated that there are two phases in the consolidation process of satu- rated soil in centrifugal model test, namely the quick consolidation and the sequent slow consolidation. The quick consoli- dation process is mainly influenced by centrifugal acceleration. The application Terzaghi one-dimensional consolidation theory has its limitations in centrifugal force field. Uneven distribution and high of centrifugal acceleration on the model has a greater impact on the results, were the impact of soil weight must be considered. The existing time scale formula should be corrected by the test conditions.

关 键 词： 岩土工程 固结试验 固结理论 饱和土

领　　域： [建筑科学] [建筑科学] [建筑科学] [建筑科学]