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为研究变截面单桩在横向静载荷作用下的变形及承载特性,选取4根不同变径位置的模型桩,设计了可以在同一介质中同时完成4根桩的模型箱和模型加载设备,开展了变截面单桩横向静载荷作用下变形及承载特性模型试验研究。运用EVD,DPL等方法对桩周介质材料和填筑参数进行了测试与评价,测试分析了4种不同变截面位置的阶梯型变截面桩桩身拉、压应变曲线、桩顶水平荷载位移曲线。研究结果表明:变截面桩横向受力比直桩合理;变截面桩变径段长度占整个桩长40%~50%时效率最高,变径段长度超过桩长50%时,对提高桩横向承载力作用有限;桩顶荷载-位移曲线呈现典型的非线性特征。
In order to study the deformation and bearing characteristics of single-section single-piles under lateral static load, four model piles with different diameter reduction positions were selected, and the model box and model loading equipment which could finish 4 piles simultaneously in the same medium were designed. A MODEL TESTING STUDY ON DEFORMATION AND LOAD - BEHAVIOR UNDER TRANSVERSE SQUARE STATIC LOADS. EVD and DPL were used to test and evaluate the media and filling parameters of the pile circumference. The tensile and compressive strain curves of the pile with four sections of variable cross-section were tested and analyzed. The horizontal displacement curve of pile top . The results show that the lateral stress of the variable cross-section pile is more reasonable than that of the straight pile. When the length of the variable section of the variable cross-section pile takes up 40% ~ 50% of the total length of the pile and the length of the variable diameter section exceeds 50% of the pile length, The bearing capacity has a limited role. The pile-top load-displacement curve shows typical nonlinear characteristics.