摘要
以南沙群岛永暑礁的钙质砂为研究对象 ,通过拉拔试验发现 :钢 -砂接触面剪应力和相对剪应变曲线没有明显的应变软化现象 ,颗粒破碎对外摩擦角的影响不大。基于概率统计和损伤力学理论对钙质砂与结构物界面的力学特性进行了探讨 ,建立了弹性损伤统计本构模型 ,从微观机理上解释了钙质砂中桩侧阻力低的特殊性状。
Calcareous sand at Yongshu reef of Nansha islands is investigated. Through the calcareous sand-steel interface direct shear tests,it shows that the curves of shear stress vs relative shear strain have no evident strain softening, the effect of the particle breakage on outer friction anger is little. Based on the statistical and damage mechanics theory, the behaviors of calcareous sand-structure interface are studied, then its elastic statistical damage constitutive model is developed. Finally, the special low skin friction of pile in calcareous sand is explained from micro-mechanism.
出处
《勘察科学技术》
2004年第5期7-9,30,共4页
Site Investigation Science and Technology
基金
国家九.五攻关课题 ( 97-92 6-0 3 -0 2 )资助项目
