论文部分内容阅读
正在施工中的四川铜街子水电站,拦河坝坝基靠左岸处有一深槽,槽口宽约40米,最深达70米,主要充填砂卵石,但中部夹有20米厚的粉细沙。由于挖除困难,采用覆盖层上建堆石坝,坝基设混凝土防渗墙的方案,并布置有重力式导流明渠边墙等建筑物。根据沙层物理力学性质判断,地震时有可能出现砂基液化,且地基内压应力亦将超过沙
Sichuan Tongjiezi Hydropower Station under construction has a deep groove at the left bank of the dam dam. The slot width is about 40 meters and the deepest reach is 70 meters. The sandstone is mainly filled with sand and gravel, but the middle part is sandwiched with fine sand with a thickness of 20 meters. Due to the difficulty of excavation, the project of building concrete cutoff walls with dam foundation and dam foundation is adopted on the cover, and buildings such as gravity diversion canal ditches are arranged. Judging from the physical and mechanical properties of sand layers, sand-based liquefaction may occur during earthquakes and the compressive stress in the foundation will exceed sand