doi:10.16186/j.cnki.1673-9787.2020.6.22

Received:2020/02/11

Revised:2020/04/13

Published:2020/11/15

Shear characteristics of rockfill material under maximum dry density condition

LIANG Wei1, ZHAO Weisheng1, DENG Daiqiang1, DU Jun2, JIN Xiaochuan3

1.Institute of Mining Engineering， Guizhou Institute of Technology， Guiyang  550003 ， Guizhou， China;2.School of Urban and Rural Construction & Engineering Management， Kunming University， Kunming  650214 ， Yunnan， China;3.The Northeast Party， Jiangxi Geomineral Bureau， Shangrao  334000 ， Jiangxi， China

Abstract:In order to investigate the shear characteristics of rockfill material in waste dump of metal mine under maximum dry density condition， a set of direct tests were conducted to explore the maximum dry density and the shear characteristics of a rockfill material. The results showed that the rockfill material had coarse particle contents of 60% ~70% ， the coarse particles interacted with fine particles to form the most stable structure ，and achieved the maximum dry density， the optimum moisture content also presented the minimum ； Under maximum dry density condition ， the “ structure" and " friction“ of rockfill material were strengthened ， and its shear strength parameters had been significantly improved compared with the natural state， the c value had increased by 14% ~ 115% ， and the φ value had increased by 53% ~ 72% ； Under maximum dry density condition the shear process could be divided into three stages ： start-up， development and failure， the shear curve showed strain-hardening characteristics； The samples shrank at the initial stage of shear process， then gradually changed from shrinkage to dilatancy effect at the development stage， and the dilatancy effect was enhanced at the failure stage. The research provide a useful reference for understanding the shear characteristics of rockfill material in waste dump.

Key words:rockfill material;direct shear test;maximum dry density;shear characteristic;shear dilatancy

最大干密度条件下散体岩石物料的抗剪特性_梁维.pdf