【作者】 刘汉龙； 梁军； 高玉峰；

【Author】 Liu Han-long;Liang Jun;Gao Yu-feng 1 Institute of Geotechnical Engineering,Hehai University,Nanjing 210098 China 2 Sichuan Provincial Bureau of Water Conservancy,Chengdu 610017 China

【机构】 河海大学岩土研究所；

【摘要】 堆石料在长期荷载作用下,由于颗粒破碎滑移充填孔隙,产生流变变形,其抗剪强度将产生一定程度的变化形成长期强度。最初一段时间软弱颗粒逐步破碎细化,压碎塑性变形增加,内摩擦角φ随时间衰减;后来,堆石破损表面逐步达到力的平衡,破碎不再发生,破碎细化的堆石颗粒逐步开始向孔隙充填转移,堆石的内摩擦角φ也不再衰减,而呈缓慢增长的趋势。实际工程观测分析的结果表明,堆石强度在变形后期有所增长。根据堆石料长期强度特性并进行计算分析,堆石坝体在流变期间的强度衰减不会对坝坡稳定性形成不利影响,堆石体能够长期维持较陡的边坡。更多还原

【Abstract】 The shear strength will be changed properly to form so called long-term strength finally, because itoccurs creep strain due to pores among the rockfill filled with finely broken coarse materials. During the period ofsoft and weak coarse grains getting broken and finely-divided, the angle φ of internal friction decreases inaccordance with increase of time as well as crushed plastic deformation. The angle φ of internal friction of rockfillis not decayed but tend to be increased slowly when the surfaces among coarse grains come to static equilibriummeanwhile no happening of breakage and the pores among coarse materials filled with finely divided smallerparticles, which is the same with the results of in-situ observations that the strength will be increased after creepdeformation. Based on properties of long-term strength and calculating analysis, the strength decrement whichoccurs in the period of creep strain has little harmful influence to the stability of rockfill dam slopes and keep itstable for a long time.更多还原