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在离心机动力荷载作用下,对两个适当比尺,不同刚度的悬臂式挡土墙模型进行试验。墙后按回填土坡度范围填以中等密实的细砂。对于离心模型,设计了一个地震激振装置,使其能产生相当于震中区地面发生接近于5.5级地震的振动。因输入动力所引起的挡土墙模型的反应,用应变计、压力传感器和加速度计来量测。根据测量值,标绘沿整个墙高,以时间为函数的弯矩、剪力、压力以及位移的曲线图。将此成果与用 Mononobe—Okabe 拟静力理论的计算值相比较。虽然,计算的合力值与试验值较一致,但弯矩相差较大。振动结束后,所有参数的残余值都比初始的静力值大得多。为此,建议在挡土墙的地震设计中考虑这些动力性态。
Under the dynamic load of centrifuge, two cantilevered retaining wall models with appropriate scale and different stiffness were tested. After the wall, fill the medium-compact fine sand with the slope of the backfill. For the centrifugal model, a seismic excitation device was designed so that it can generate vibration equivalent to an earthquake of magnitude 5.5 near the epicentral region. The response of the retaining wall model due to input power is measured by strain gages, pressure sensors, and accelerometers. Based on the measured values, plot the bending moment, shear force, pressure, and displacement along the entire wall height as a function of time. This result is compared with the calculated values using Mononobe-Okabe pseudo-static theory. Although the calculated resultant force values are more consistent with the experimental values, the bending moments differ greatly. After the vibration is over, the residual value of all parameters is much larger than the initial static value. For this reason, it is recommended that these dynamic states be considered in the seismic design of retaining walls.