CAJ | 학술논문

试样制备是土工模型实验中至关重要的技术环节，装样的质量直接影响着模型实验的成败。为获得高度可重复的指定相对密度的均匀试样，自主研制了基于伺服电机驱动系统的自动撒砂装置。采用福建标准砂进行了多组砂雨法成样的对比试验，分析了砂样落距和流速对成样相对密度的影响。同时通过相对位置测试、CPT 强度测试和桩基础承载力离心模型实验，检验了撒砂装置的有效性。试验证明相对密度随砂样落距的增大而增大，随流速增大而减小，且该装置制得的试样均匀性好，可重复度高。
시양제비시토공모형실험중지관중요적기술배절，장양적질량직접영향착모형실험적성패。위획득고도가중복적지정상대밀도적균균시양，자주연제료기우사복전궤구동계통적자동살사장치。채용복건표준사진행료다조사우법성양적대비시험，분석료사양락거화류속대성양상대밀도적영향。동시통과상대위치측시、CPT 강도측시화장기출승재력리심모형실험，검험료살사장치적유효성。시험증명상대밀도수사양락거적증대이증대，수류속증대이감소，차해장치제득적시양균균성호，가중복도고。
The sample preparation is very important as a vital technique in geotechnical model tests,the quality of which directly determines the success or failure of modelling test.A servomotor-driven automatic sand-pour device has been de-veloped to obtain the homogeneous sandy sample of the designated relative density with high repeatability.Here,several series of comparative pluvial modelling tests with Fujian standard sand are carried out to analyze the influence of drop height and flow rate on the relative density.Simultaneously,the validity of new sand-pour device is checked through rela-tive position test,CPT penetration test and centrifugal modelling test of the bearing capacity of pile foundation.The re-sults show that the relative density of the sample is increased gradually with the increasing of drop height,while decreased with the increasing of sand flow rate,and this newly-developed device is able to prepare the sand specimen with high uni-formity and high repeatability.