摘要
针对某水电站11坝段开挖揭露的深槽,在深槽两岸及揭露的槽壁内布置斜孔、铅直孔和水平孔,对深槽风化情况、卸荷带、岩体质量等级进行研究,为深槽处理方案设计提供基础资料。深槽开挖过程中,运用同样的方法对深槽不同高程结构面和声波孔测试结果进行统计研究,并进一步修正前期研究结果。结果表明:深槽两壁上部风化程度强于下部,底部为弱下风化岩体;深槽上部卸荷相对较深,底部卸荷较轻微,与前期卸荷带划分结果基本相同;较之深槽全面开挖前对深槽岩体质量等级的预测,受开挖影响,表部Ⅲ2级岩体有所增加,但与预计的相同,深槽以Ⅲ1级岩体和Ⅱ级岩体为主。表明前期深槽刚刚被开挖揭露时采取的一系列快速研究方法和手段是有效的。
This paper studied on weathering extent,unloading zone and quality of rock mass for a deep narrow channel uncovered during foundation excavated of the 11th dam section by means of inclined,vertical and level boreholes.Using the same methods,this paper studied on different？elevation structure surface and acoustic？hole？test results during the excavation of the deep narrow channel as well and revised the results obtained earlier.The results show that weathering extent of top parts is more intensive than middle and bottom parts in both sides of channel;the unloading zone of top part is relatively large and the bottom part is slight,which is as the same as initial partition results.Comparing with the forecast before excavation of the channel,the quality grade near surface rock mass is Ⅲ2 grade influenced by excavation.The quality of rock mass of the channel is mainly about Ⅲ1 and Ⅱ grade as prediction.It indicates that the sorts of rapid method used when the channel is just uncovered are efficacious.
出处
《人民黄河》
CAS
北大核心
2013年第7期131-133,共3页
Yellow River
关键词
地质缺陷
坝基开挖
深槽
风化程度
卸荷带
岩体质量
geological defect
excavation of dam foundation
deep narrow channel
weathering extent
unloading zone
quality of rock mass
