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通过中砂与结构物接触面半模直剪试验,结合数字照相变形量测DPDM(Digital Picture Deformation Measurement)技术,对各级荷载下砂土在直剪试验中的变形场进行失效分析。采用数码相机对半模试验过程中砂与剪切面运动进行全程拍摄,应用DPDM技术对拍摄结果进行处理,得出土体的位移场和应变场云图,发现砂土的位移量和剪应变量达到最大值的区域总是发生在结构物中部附近,且在到达该最大值后,其变化不再随着相对位移的增加而发生变化。说明当土与结构物相互作用过程中土体总位移分布不再发生变化时,土与结构物相互作用失效;土体最大剪应变呈明显的袋状分布,且当分布不随相对位移的增加而发生变化时,土与结构物相互作用失效。
Through the half-mold direct shear test of the contact surface between the sand and the structure, combined with the Digital Picture Deformation Measurement (DPDM) technique, the deformation field of the sand in direct shear test under various loads was analyzed. The digital camera is used to photograph the movement of sand and shearing plane in the process of half-mold test. The DPDM technique is used to process the shooting results to obtain the displacement and strain fields of the soil. The displacement and shear strain of the soil are found to reach The area of the maximum always occurs near the middle of the structure, and upon reaching this maximum, the change no longer changes with increasing relative displacement. It shows that the interaction between soil and structure fails when the total soil displacement distribution does not change during the interaction between soil and structure. The maximum shear strain of soil shows obvious bag-like distribution. When the distribution does not change with the relative displacement When changes occur, the interaction between soil and structure fails.