论文部分内容阅读
水利水电工程勘察设计中的坝址、坝型选择,枢纽布置;以及坝址选定后的基岩利用标高和相应开挖深度的确定等,都与岩体的风化、卸荷等因素有密切关系。研究风化岩体的工程特性、分带标准,对合理地利用岩体与拟定坝基开挖后的防护或改善措施;避免施工过程中的盲目被动,以加快水电建设步伐,缩短勘察设计周期等,都具有十分重要的意义。其它如边坡稳定性预测,天然建筑石料的质量与有效储量的评价等,也都与岩体的风化程度有直接关系。但十分完善而又不经改善处理的地质条件是非常罕见的,往往都要在工程地质与岩体力学研究的基础上,对一些薄弱地段予以加固改善,甚至改变上部结构藉以适应不良地基的要求。水工建筑物因地基不良而导致失事的实例,“据统计,国外重力坝失事中,有45％是
The selection of dam site, dam type and hub layout in water conservancy and hydropower engineering survey and design, as well as the determination of bedrock elevation and corresponding excavation depth after dam site selection are all closely related to the weathering and unloading of rock mass and other factors relationship. To study the engineering characteristics and zoning standards of weathered rock mass, to make rational use of the rock protection and improvement measures after the excavation of the dam foundation; to avoid the blind passive during the construction, to speed up the pace of hydropower construction and shorten the investigation and design cycle, All have very important meanings. Other such as slope stability prediction, the quality of natural building stone and the evaluation of effective reserves, are also directly related to the degree of weathering of rock mass. However, it is very rare that the geological conditions which are perfect without being improved should be reinforced and improved in some weak areas on the basis of engineering geology and mechanics of rock mass, and even the superstructure should be changed to meet the requirements of poor foundation . Hydraulic construction due to poor foundation caused the accident example, "According to statistics, foreign gravity dam failure, 45% is