论文部分内容阅读
水库坝基的渗漏问题一直是影响水库大坝稳定性的主要问题之一,因此确定渗漏位置与计算渗漏量尤其重要。本文以恰让水库为例,采用数值方法计算了坝基的地下水位和渗漏量,并与实测水位和渗漏量进行拟合,反演得到坝基岩体和断层的渗透系数。基于反演的渗透系数,考虑了增加帷幕深度、部分断层灌浆以减少渗透系数的方法,对坝基渗漏量进行了预测。计算结果表明,左岸渗漏量约占总渗漏量的40%,而右岸为60%,因此大坝右岸为主要渗漏量来源,其中通过F2断层和F17断层的渗漏量约占总渗漏量的26%和11%,因此这两条断层为坝基处主要的渗流通道。水库蓄水位的大小、帷幕的渗透性以及断层的存在都对坝基的渗漏量有影响,其中顺河向断层的影响较大。
Leakage of reservoir dam foundation has always been one of the major problems affecting the stability of reservoir dams. Therefore, it is especially important to determine the leakage location and calculate the leakage. Taking Qialai Reservoir as an example, the groundwater level and leakage of the dam foundation are calculated by numerical method. The measured water level and seepage amount are fitted to obtain the permeability coefficient of dam foundation and fault. Based on the calculated permeability coefficient, the seepage quantity of the dam foundation was predicted considering the method of increasing the curtain depth and partially grouting to reduce the permeability coefficient. The calculation results show that the leakage on the left bank accounts for 40% of the total leakage and the right bank is 60%, so the right bank of the dam is the main source of leakage, of which the leakage through F2 and F17 accounts for about 26% and 11% of the leakage, so these two faults are the main seepage channels at the dam foundation. The size of the reservoir water level, the permeability of the curtain and the presence of the fault have an impact on the seepage of the dam foundation, of which the influence of the fault along the river is larger.