【摘要】 对向家坝水电站坝基地质情况及坝基处理措施作了全面介绍,提出了向家坝坝基大型破碎带开挖、存留和处理超出已有工程经验,但现有计算分析方法仍然适用;重力坝坝基变形控制、防渗、抗滑相互关联,稳定、应力、变形、渗流分析和工程处理措施均应统筹考虑;渗透稳定的影响因素除渗透坡降外,大渗流量情况还应关注地下渗流的冲刷作用,在坝基扬压力受控的前提下,可调控出水量大的排水孔以减小、均化排水量,降低渗流流速,保证渗透稳定。更多还原

【Abstract】 The geological conditions and treatment of dam foundation in Xiangjiaba Hydropower Station are comprehensively analyzed. The conclusions show that,( a) although the excavation, retention and treatment of large-scale crushed zone in dam foundation are beyond the difficulty that could be addressed with existing engineering practices,current methods of calculation and analysis are still applicable;( b) as the deformation control, seepage proofing and sliding resistance at the foundation of gravity dam are inter-related with each other, the analyses on stability, stress,deformation and seepage as well as their engineering treatment measures shall be considered as a whole; and( c) in addition to seepage slope as one of factors affecting seepage and stability, the scouring effect of subsurface seepage flow shall also come under scrutiny in case of high seepage flow. When the uplift pressure at the foundation has been put under control, the drain holes with high flow may be adjusted to secure seepage stability by reducing and homogenizing the water discharge and lowering down seepage flow.更多还原