【摘要】 作为一种轻型支挡结构,预应力锚索桩板墙具备安全、可靠、造价低等优势,汶川地震也证明了它具有良好的抗震性能。但由于此结构体系的受力复杂,目前一系列基础研究问题仍没有解决,理论研究远落后于工程实践,特别是在抗震设计理论研究方面。通过最直接的室内研究手段——大型振动台试验对预应力锚索桩板墙进行了地震响应研究,输入加速度时程选取卧龙台站实测水平向和竖直向地震波,并按相似比处理,测试了桩身6个高度位置的地震土压力、2个高度位置的位移、边坡中5个高度位置的加速度以及锚索预应力的时程变化。试验结果揭示了预应力桩板墙在地震作用下的土压力分布规律、桩身位移和锚索预应力的地震响应特征以及加固边坡的动力特性和加速度放大效应,为深入了解预应力锚索桩板墙的抗震表现和抗震机理提供了可靠的依据。更多还原

【Abstract】 The prestressed anchor sheet pile wall is a type of light retaining structure which has been widely used in recent twenty years.This structure has advantages of safety,reliability and low construction cost,and it has been successfully used in railways,highways and other projects.In addition,the prestressed anchor sheet pile wall has been proven to be an excellent seismic structure from investigation of damaged earth structures in Wenchuan Earthquake in China.However,due to the complex stress system,a series of fundamental and theoretical issues of construction technology are not solved completely,and its theoretical understanding lags greatly behind application,especially in the area of seismic design theory.Large shaking table tests,as the most direct laboratory test method,are performed to study seismic response.Scaled horizontal and vertical accelerations recorded at the Wolong Station in Wenchuan Earthquake are used to excite the model wall.Time histories of seismic earth pressures at 6 levels,displacements of the wall at two levels,accelerations at 5 levels in the slope and the prestress of cable are measured.The test results reveal the distribution pattern of earth pressures,seismic response of displacement and cable prestress,dynamic characteristics and amplification effect of reinforced slopes under earthquakes,and they provide a reliable basis for understanding the seismic behaviors and mechanism of the prestressed anchor sheet pile wall.更多还原