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基于受静载和循环荷载作用的基础下加筋挡墙模型试验,综合对比分析了基础位置、荷载大小、频率和循环次数等因素对加筋挡墙力学与变形性能的影响。试验结果表明:(1)以基础极限承载力为标准,确定基础最佳偏移距离为0.3H(墙高);(2)基础沉降和挡墙水平位移随荷载、频率和循环次数的增加而增加,当基础受静载且达到极限承载力前,沉降与墙高比均小于2%,挡墙水平位移与墙高比均小于1%;当基础受循环荷载时,增加循环荷载水平和频率使初始阶段基础沉降和挡墙水平位移增加明显,但随循环次数增加而变形收敛;(3)紧邻基础下方的筋材应变显著高于其他层,且循环荷载水平越高,循环次数增多时筋材应变增幅显著;(4)静载时挡墙破坏随基础偏移距离增加而由初始顶层面板被挤出,逐渐过渡到破坏面沿基础边缘并向挡墙深部发展的剪切破坏为主;当基础受循环荷载且频率较小时,顶层面板以挤出变形为主,增加荷载水平和频率,挡墙以中部面板挤出破坏为主。
Based on the reinforced concrete retaining wall model tests under static and cyclic loading, the influences of the foundation position, load size, frequency and cycle number on the mechanical and deformation properties of the reinforced retaining wall were comprehensively analyzed. The test results show that: (1) The basic optimal bearing distance is 0.3H (wall height) based on the ultimate ultimate bearing capacity; (2) The horizontal displacement of foundation settlement and retaining wall increases with load, frequency and cycle number When the foundation is subjected to static load and the ultimate bearing capacity is reached, the settlement-wall-height ratio is less than 2% and the horizontal displacement and wall height ratio of the retaining wall are both less than 1%. When the foundation is subjected to cyclic loading, the cyclic loading and frequency The initial settlement and the horizontal displacement of the retaining wall increase significantly, but the deformation converges with the increase of the number of cycles. (3) The strain of the material immediately below the foundation is significantly higher than that of the other layers, and the higher the cyclic loading, the more the number of cycles (4) The failure of retaining wall at static load increases with the increase of base offset, and the initial top plate is extruded and gradually transitions to the shear failure along the foundation edge and the deep development of the retaining wall. When the foundation is subjected to cyclic loading and the frequency is small, the top panel is dominated by extrusion deformation, which increases the load level and frequency. The retaining wall is dominated by the extrusion of the middle panel.