香港大学钻孔过程数字监测仪在土钉加固斜坡工程中的应用

介绍了一台新型的能够自动、客观和连续不断地记录和监测钻孔过程的钻孔过程数字监测仪(DPM)。钻孔过程可由一些随时间变化的钻孔参数来表述,这些参数包括钻杆和钻头的位置、位移和转动,以及钻机对钻头施加的各种动力载荷。此便携式监测仪可快速地安装到钻探机或钻孔机上,并且已经在香港防止山泥倾泻的斜坡加固工程中得到应用。通过实例讨论阐述了在风化岩土斜坡中安装土钉的钻孔过程实测结果。这些实测结果是从香港斜坡防护常用的土钉钻孔过程中得到的。这些实测结果表明钻孔过程参数随时间的动态监测可为工程质量管理和控制以及岩土工程设计和检验提供丰富、有利的真实数据和资料。

USE OF HKU DRILLING PROCESS MONITOR IN SLOPE STABILIZATION

The research and development of an innovative prototype digital drilling process monitor (DPM) are presented. DPM can automatically objectively and continuously measure and record the drilling process while a hole is being drilled in the ground. The drilling process is defined by the parameters including the drilling chunk positions,head positions,deformation and rotation,and the dynamic pressures. The prototype DPM is portable and can be easily mounted to a drilling machine. The prototype DPM is applied to slope upgrading works in Hong Kong. The factual data and results are presented from the monitoring of drilling holes for the installation of soil nails in weathered soil and rock slopes. The results show that the variations of the drilling parameters with time can provide rich and useful factual data and information for geotechnical design and verification,construction management and quality control.