基于计算机辅助检测技术的滑坡模型试验坡面位移场测量

Surface displacement field measurement for landslide model test based on computer aided inspection

将计算机辅助检测技术(computer aided inspection,CAI)引入到滑坡物理模型试验坡面位移场测量中,采用高精度的三维激光扫描设备对滑坡物理模型试验中坡体表面的位移和变形进行全方位的监测,采用"3D比较"测量坡体表面位移场。提出采用计算机辅助检测技术测量滑坡模型试验中坡体表面位移场的技术路线,并通过抗滑桩加固滑坡模型进行了实例测试,获得满意的结果。结果表明,计算机辅助检测技术可以最大限度的采集坡体表面的三维数据,获取坡体信息丰富、全面的位移场结果,避免传统单点监测以点带面的局限性;应用计算机辅助检测技术直观展现传统监测方法难以观察到的坡体边界效应、土拱效应等试验现象;计算机辅助检测技术所测位移场规律性好,与定性及理论结果相符,与试验过程中各种现象符合很好,结果可信、可靠。

Computer aided inspection (CAI) has been successfully applied to measure the surface displacement field in landslide model test. The deformation and the surface changes during the test were tracked and monitored by 3D laser scanner with high degree of precision and resolution. The surface displacement field can be obtained by 3D measurement between the reference and tested object. The technical route for CAI in landslide model test was put forward and the practical test stabilized with piles has been carried out;and satisfactory results were achieved in the test. The results show that this method is available to provide a rapid collection of field topographical data with extremely high density and a comprehensive information for the surface displacement field that are difficult to obtain in point based measurement. The boundary effect and the soil arching effect can be represented more intuitively and vividly by CAI. The test results indicate that the surface displacement field measured by this technique is of evident regularity and its measurement results fit well with the qualitative analysis, theory analysis and phenomenon occurring in the process of the model test. And the displacement field results are creditable and reliable.