离心模型试验中边坡开挖设备的研制与应用

Development and application of a slope excavation device for centrifugal model tests

针对目前边坡开挖研究中离心场开挖模拟技术的不足,在清华大学土工离心机上开发了一种可在离心模型试验过程中模拟边坡开挖的有效设备。该设备利用两个电机和滑轨模拟边坡开挖过程中的下切和推拉两个过程,结合现有的离心场图像采集和位移测量系统即可实现离心机运行过程中的实时开挖和多次开挖,并通过试验验证了该开挖设备的有效性和可靠性。利用该设备进行了土坡开挖的离心模型试验,再现并记录了边坡开挖后的变形破坏过程。

The problems induced by slope excavation is quite common in practice.Considering the disadvantages of previous excavation simulation technology in the centrifuge,a new device is developed based on the centrifuge of Tsinghua University to conduct the excavation of a slope in flight.Two electric motors and linear guide tracks are used to simulate the two main processes： ＂cut＂ and ＂pull＂,and then live excavation and multi-excavations can be achieved with the image-capture and displacement-measurement systems.Using this device,centrifugal model tests are conducted by recording the deformation processes of the slope after excavations.