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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。
Under the condition of geogrid-reinforced aeolian sand, geosynthetic reinforced aeolian sand and un-aerated aeolian sand foundation, 9 workers under the load-lifting combined effect of 3 different-size inclined-column extensions Situation of the field test. According to the basic top load and displacement, the change of the base soil pressure and the distribution of the surface cracks, the influence of the foundation size, reinforcement material and laying method on the basic bearing capacity of the aeolian sand slatwall was analyzed. Sand foundation damage mechanism. The results show that under the combined loading of reinforced aeolian sand inclined column, the bearing mechanism is that the compressive-plastic zone of foundation above the foundation plate appears and further develops, and the progressive failure process of local shear failure The rupture surface of the foundation has asymmetry; ② geogrids improve the bearing capacity and deformation resistance of the anti-pull and anti-overturning of the aeolian sand foundation, and the smaller the spacing of the laying layers, the better the improvement effect; geotextile mat due to its easy Deformation characteristics can not increase or even reduce the carrying capacity of aeolian sand foundation. (3) Reducing the height of foundation outcrops, increasing the depth of foundation and expanding the size of foundation floor can effectively improve the foundation pull-out and horizontal bearing capacity.