振动荷载对厦门地区红黏土抗剪强度影响的试验与分析

以厦门某建筑工地红黏土为试样,进行振动荷载作用前、后三轴剪切对比试验。通过对试验数据的分析,对振动荷载对试样的黏聚力、内摩擦角、抗剪强度方程、抵抗侧向变形能力等的影响特性进行研究。研究结果显示,在其他试验条件相同的情况下,经振动荷载作用后的红黏土试样黏聚力降低51.72%,内摩擦角减少50%,抗剪强度线向下显著偏移,表明振动荷载不利于红黏土的稳定和承载。研究结论对防治岩土工程和地质灾害等具有一定的理论和现实意义。

EXPERIMENTS AND ANALYSIS OF INFLUENCE ON VIBRATORY LOAD TO SHEAR STRENGTH OF RED CLAY IN XIAMEN

Triaxial shear tests are done before and after vibratory load actings,and the testing samples are the red clay in Xiamen.The effects of vibratory loading on sample's cohesive force,internal friction angle,shear strength equation and the ability to resist side distortion etc are studied by analyzing test data.After vibratory load actings, the cohesive strength index and internal friction angle of the sample are decreased by 51.72% and 50% respectively;and the shear strength curve shifts down obviously under same testing conditions.The results show that vibratory load acting is disadvantage to stabilization and bearing capacity of red clay.The research conclusions have theoretic and practical significance for us to prevent geotechnical engineering disasters and geologic disasters.