海湾相有机质浸染砂的动力特性试验研究

海南省沿海地区分布着一种特殊的海湾相有机质浸染砂,为研究其动力特性,利用动三轴仪进行了不同围压和含水率下的动力变形特性及动强度特性试验研究。分析含水率、围压对其动应力-动应变关系、动弹性模量、阻尼比的影响。试验结果表明：在动应变不变的条件下,动应力随含水率的增多而减小,随围压的增大而增大;动弹性模量在含水率变化时,变化趋势较平缓;阻尼比随着动应变的增加而增大,随含水率的增大而减小。在围压改变时,阻尼比的变化不明显。为海南省海湾相有机质浸染砂地区构筑物的动力计算参数的选取提供参考依据。

Experimental study on dynamic characteristics of bay facies organic sand

A special kind of bay facies organic sand is distributed in the coastal areas of Hainan Province. In order to study its dynamic characteristics, the tests on dynamic deformation and strength properties under different confining pressures and moisture contents are performed. The dynamic stress-dynamic strain relation, dynamic elastic modulus, damping ratio and dynamic strength of the samples under various moisture contents and confining pressures are analyzed. The tests indicate that, under the constant dynamic strain, the dynamic stress decreases with the increase of the moisture content and increases with the increase of the confining pressure. When the moisture content changes, the change trend of the dynamic elastic modulus is relatively gentle. The damping ratio increases with the dynamic strain and decreases with the moisture content. When the confining pressure changes, the damping ratio does not change obviously. It may provide a reference basis for the selection of dynamic parameters of structures in the bay facies organic sand-impregnated sand areas of Hainan Province.