砂土中群锚锚周土体变形特性模型试验研究

群锚是常见的基础形式应用较为广泛，由于群锚之间的相互作用，群锚上拔过程中锚周土体的变形破坏机制比较复杂。采用非接触式数字图像相关方法（DIC）对群锚上拔过程开展模型试验研究，分析了群锚上拔过程中上拔力-位移关系曲线特征和锚周土体变形破坏机制。试验结果表明，密实度和埋深对群锚上拔力-位移关系曲线特征具有显著影响，在相同密实度、相同埋深率下浅埋与深埋群锚与同条件下的单锚具有相似的上拔力-位移关系曲线特征；群锚抗拔承载力具有明显的叠加效应，且砂土密实度、埋深和锚间距等参数因素对群锚效应具有显著影响。通过变形场的研究，得出了砂土密实度、埋深以及锚间距对群锚效应的影响规律。

Experimental study of soil deformation around group anchors in sand

The group anchor，as one of popular foundations, is widely used. The soil deformation mechanism around group anchors when uplifting is sophisticated due to the interaction between anchors. The non-contact digital image correlation(DIC) method is used to perform model tests to study the behavior of group anchors when uplifting. The curve characteristics of uplift force-displacement relationships and soil deformation mechanism around anchors when uplifting are analyzed. The test results show that the relative density and embedment depth have significant influence on force-displacement relationships. Shallow and deep group anchors and single anchor have the similar curve characteristics of force-displacement relationship at the same relative density and embedment depth. Superposition effect is observed for group anchors. The factors such as relative density, embedment ratio and spacing between anchors have significant influence on group efficiency. The degree of influence of relative density, embedment ratio and spacing between anchors on group efficiency are obtained by deformation fields.