压实度对坝体填土力学特性影响试验

Experimental Study on Influence of Compaction Degree on Mechanical Properties of Dam Fill

为分析坝体填土压实特性,分别对0.75,0.8,0.85,0.9和0.95共5种不同压实度填土进行饱和固结排水三轴压缩试验,试验围压分别为25,50,100和200 kPa。结果表明,随压实度增大,填土孔隙减小,颗粒咬合越紧密,填土抗剪强度、内摩擦角和黏聚力均逐渐增大;随围压增大,压实度对坝体填土抗剪强度影响逐渐增大。

In order to analyze the compaction characteristics of dam fills,saturated consolidation drainage triaxial compression tests were carried out on five kinds of fills with different compactness,namely,0.75,0.8,0.85,0.9 and 0.95.The confining pressures of the tests were 25 kPa,50 kPa,100 kPa and 200 kPa,respectively.The results show that with the increase of compactness,the filling pore decreases and the particles occlude tightly,the shear strength,internal friction angle and cohesion of the filling gradually increase;with the increase of confining pressure,the influence of compactness on the shear strength of dam filling gradually increases.