某坝址河段不良地质现象对枢纽设计方案选择的影响

Impact of Adverse Geological Conditions on A Dam Site on Selection of Pivot Design Scheme

马岩洞水电站采取高坝、引水式开发。规划坝址河段地处岩溶高山峡谷地区,为典型向斜走向谷,河谷自上而下从马岩向斜北西翼转折端-核部-南东翼转折端通过,两岸地形极不对称,河段内发育有巨型危岩体、高顺向坡、碎裂结构岩溶含水层、岸坡卸荷拉裂缝、河床深厚覆盖层等不良地质现象,对坝址选择、坝型选择、厂房布置、大坝防渗线路选择、引水隧洞进口段施工等起制约影响作用。故此,水电工程勘测设计选址中对大型不良地质体、已建库内淤积及工程开挖对高顺向坡稳定不利影响等应予高度重视,宜首先考虑避让或主动调整枢纽设计方案以适应地质条件。

Mayantong Hydropower Station will be exploited by taking high dam and diversion way. Tne planning dam site section has some adverse geological phenomena such as giant dangerous rocks, high consequent slopes, karst aquifers with broken structure, unloading tension cracks on the bank slopes, deep overburden on the river bed and etc. These adverse conditions contain the pivot layout and selection of dam type. These negative impacts of adverse geological conditions should be paid close attention in selection of dam site.