摘要
建基岩体开挖松弛及其形成的松弛带是水利水电工程中一种常见的现象,对建基岩体的岩体质量有重要的影响。建基岩体在开挖后必然产生新的爆破裂隙,同时伴随开挖卸荷、应力的释放,尽管岩体并未发生进一步风化,但因岩体发生松弛、卸荷,在浅表部形成松弛带,因此,确定松弛带厚度及其分布,更有效地对松弛、卸荷岩体进行处理具有重要的工程实际意义。本文在现场地质环境条件调查、原位声波测试及室内综合分析的基础上详细地对一重力坝层状建基岩体的松弛带厚度及其特征进行了研究,并分析了建基岩体产生深部松弛的原因,在此基础上分析了对建基岩体工程特性的影响,其成果对类似工程的坝基开挖实践具有指导作用。
Relaxation and its relaxation zone of excavated foundation rock mass is a kind of common phenomenon in hydropower project. They have important influence on the foundation rock mass quality. The foundation rock mass after excavation is bound to produce new blasting cracks along with the excavation unloading and stress release. Although it has not been further weathered, rock mass can form a relaxation zone in the superficial depth, with it.s relaxation and unloading. Therefore, determination of relaxation zone thickness is of great significance in engineering. The paper is based on the field of geological environment condition survey and acoustic test and the indoor synthetic analysis. It studies a relaxation zone thickness and characteristics of layered foundation rock mass and analyze the foundation rock causes of deep relaxation. On the basis, it analyses the relaxation zone that has influence on the engineering properties of the foundation rock, which has instructive function for dam foundation excavation practice of similar projects.
出处
《工程地质学报》
CSCD
北大核心
2014年第1期124-129,共6页
Journal of Engineering Geology
基金
国家自然科学基金项目(41072229)资助
关键词
建基岩体
松弛带
钻孔声波
工程特性
Foundation rock mass, Relaxation zone, Borehole acoustic wave, Engineering chsracteristics
