库布齐风积沙对各分级河砂的填充效应

Filling Effect of Kubuqi Aeolian Sand on Different Classifications of River Sand

为探究风积沙部分取代河砂带来的填充效应对细骨料空隙率的影响规律,采用库布齐沙漠边缘的风积沙,以不同取代率取代粗、中、细3级共9种细度模数的河砂,测试其对细骨料空隙率的影响;同时采用PFC3D离散元软件进行相应细骨料的堆积模拟,确定了库布其风积沙对不同分级、不同细度模数河砂的最优取代率.另外,采用与库布其风积沙级配一致的河砂进行了相似的试验与模拟探究,通过对比前期的试验结果,确定了库布齐风积沙对不同细度模数河砂、不同取代率情况下的细骨料空隙率粒形影响因子.

In order to explore the influence of replacing river sand with aeolian sand on filling effect and voidage of fine aggregate,the optimal replacement rate of aeolian sand for river sand with different fineness modulus in different grade distribution areas was determined.This work was accomplished through the following two aspects.The first was comparative analysis of the data of voidage,which was obtained by the replacement of aeolian sand to 9 groups of river sand with different grade distribution areas under different replacement rates.The second was simulation of fine aggregate which was operated by PFC3D discrete element software.In addition,the river sand with the same gradation as Kubuqi aeolian sand was used to carry out similar test and simulation exploration.By comparing the previous test results,the influence factors of the grain shape of the aeolian sand in the Kubuqi desert on the voidage of fine aggregate under different fineness modulus river sand and different replacement rates were determined.