摘要
两河口水电站地处青藏高原东侧边缘地带,属川西高原气候区,多年平均气温为10.9℃,极端最高温度为35.9℃,极端最低气温为-15.9℃。按照冻土分类属于季节性、短时浅层冻土,无常年冻土。土料碾压后经冻融循环后出现明显胀裂,渗透系数发生了数量级增大,渗透指标已不满足设计要求。根据对不同料场和坝区土料不同深度土层温度与外界气温实测资料的试验分析,表明在表面加盖保温材料后,表层温度变化明显,夏季表层土温降低,冬季表层土温显著升高,保温效果良好。
Linghekou Hydropower Project is located at eastern edge of the Qinghai-Tibet plateau, where it belongs to west Sichuan plat-eau climate region. The carryover average temperature is 10. 9℃ ,the extremely maximum temperature is 35. 9℃ and the extremely min-imum temperature is -15.9℃.As per classification of frozen soil, soil here is the seasonal, short-time and shallow one. No year round frozen soil is available. The roller compacted soil after the freeze-thaw cycle obviously cracks because of swelling. The hydraulic conduc-tivity increases in quantity. The conductive index cannot satisfy design requirement. In accordance with test analysis on soil temperatures at different borrow areas and at different depths in dam area as well as outside air temperature measured, the surface temperature changes obviously after the surface is covered with heat insulating materials. The surface temperature decreases in summer and increases in winter. The heat insulating effect is excellent.
出处
《西北水电》
2017年第6期94-99,共6页
Northwest Hydropower
关键词
砾石土
堆石坝
温度控制
冬季填坝材料
两河口水电站
gravel soil
rockfill dam
temperature control
embankment materials in winter
Lianghekou Hydropower Project
