上拔与水平力组合作用下加筋风积沙斜柱扩展基础试验

在土工格栅加筋风积沙、土工网垫加筋风积沙以及未加筋风积沙地基条件下，开展了3个不同尺寸斜柱扩展基础上拔水平力组合荷载作用下9个工况的现场试验。根据基础的顶部荷载与位移、基底土压力变化以及地表裂缝分布情况，分析了基础尺寸、加筋材料及其铺设方式对风积沙斜柱扩展基础承载性能的影响规律,研究了加筋风积沙地基的破坏机理。结果表明：加筋风积沙斜柱扩展基础上拔水平力组合荷载作用下①其承载机理是基础底板上方地基压缩挤密-塑性区出现并进一步发展-局部剪切破坏的渐进破坏过程，且地基破裂面具有不对称性；②土工格栅提高了风积沙地基的抗拔和抗倾覆的承载能力和抗变形能力，且铺设层间距越小，改善效果越好；土工网垫由于其易变形特点，不能提高甚至降低了风积沙地基承载能力；③降低基础露头高度、增加基础埋深、扩大基础底板尺寸均可有效提高基础上拔和水平承载力。

Experiments on pad and chimney foundation in reinforced aeolian sand under uplift combined with horizontal loads

In geogrid reinforced aeolian sand,geonet reinforced aeolian sand and aeolian sand,full-scale in-site experiments on the bearing capacity behaviors of three groups of pad and chimney foundations,which have the characteristics of different embedment depths,widths of the bottom and heights above the ground level,and are subjected to uplift combined with horizontal loads,are carried out respectively.During the process of testing,the load-displacement behaviors,the soil reaction pressure and the rupture surface...