摘要
分析了勘探平洞中软弱层带取样试验存在的问题 ,研究了软弱层带受开挖松弛的影响 ,并采用了一种有效控制开挖松弛的取样办法 ,使软弱层带试验成果能反映天然地应力下的工程特性。以金沙江某水电站坝址软弱夹层为例 ,研究了地应力与软弱层带物理力学参数的关系 ,揭示了地应力是控制软弱层带工程特性最活跃的因素 ,这对岩体工程的建设和稳定性分析有指导意义。
The problems existing in the present sampling method for weak layers in exploratory adits, are discussed in this paper. Because the weak layers are easily affected by the relaxation after the excavation of exploratory adits, the test results of samples taken from exploratory adits cannot reflect the engineering properties of weak layers under natural ground stress. But the stress relaxation effect on weak layers can be avoided effectively if a special sampling method in exploratory adits is adopted.Taking the intercalations of a certain dam site in Jinshajiang River as an example, the correlations between physical and mechanical indices and confining pressure indicate that ground stress is the most important environmental factor, which controls the engineering properties of weak layers. The confining pressure effect on weak layers has a realistic significance for the construction and stability assessment of rock mass projects too.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2002年第5期584-587,共4页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金资助项目 (49672 1 66
40 0 72 0 90 )
关键词
地应力
软弱层带
干密度
孔隙比
摩擦系数
weak layer
confining pressure
dry density
porosity ratio
friction coefficient
