摘要:

SUMMARYThe packing of sands was studied over a range of moisture contents using both static loads and impacts from a Bruce compactor. Particle shape and particle size distribution were found to determine the maximum and minimum void ratio to which a sand would pack. For narrowly graded sands, air‐dry and nearly saturated sands were always found to pack more closely under a given load than the same sand at any other moisture content. There was practically no variation of packing with moisture content over a wide range of intermediate moisture contents. The bulk density attained after impact loading depended on the bulk density prior to impact and increased with the logarithm of the number of impacts. An attempt is made to give a physical explanation for these results and to relate results obtained by static loading and Bruce compactio

ISSN:0022-4588    

DOI:10.1111/j.1365-2389.1985.tb00318.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

SUMMARYThe Flevopolders in the north‐west of The Netherlands are located on recently reclaimed, uniform, flat alluvial soils. Strong contrasts in soil were thought to be unlikely. Yet thermal imagery of experimental fields carried out over 4 years revealed the presence of a striped pattern with a regular wavelength of 24 m. This was remarkable considering that drainage had been carried out at a 12 m spacing. Crop yields, topographic heights, tensiometer data, penetrometer readings and soil profiles also indicated the presence of a 24m ‘wave’. Investigations into the land reclamation procedures carried out 20 years ago finally revealed the cause. The implications for management are disc

ISSN:0022-4588    

DOI:10.1111/j.1365-2389.1985.tb00319.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY