Investigation of pilot tube micro-tunneling (PTMT) and pipe bursting construction risks

微隧道导坑法和爆管法是一种有效的非开挖地下管线安装和修复技术。这些非开挖技术非常适用于环境敏感地区、忙碌的城市核心区和成熟的社区，在这些地区，小的施工占地面积和高效的项目交付对于最大限度地减少对周围企业和居民的干扰至关重要。埃德蒙顿市排水服务部门在全市的管道安装和修复项目中采用了PTMT和管道爆破;然而，由于对相当年轻的非开挖技术的科学知识有限，因此将其应用与许多挑战和未解决的问题联系起来。此外，阿尔伯塔独特的寒冷气候要求地下基础设施的覆盖深度很高，这反过来又带来了额外的挑战。阿尔伯塔大学与该市合作，打算调查和确定这些挑战，并制定有效的战略，以减轻其频率和/或影响。研究人员将使用过去和当前城市PTMT和管道爆破项目的数据来识别和分类风险事件，并使用这些信息来制定规避风险的策略。基于初步的研究和理解，有一个验证的模型和程序，以准确预测顶推力的PTMT项目和拉力和地表移动的爆管项目的不足。这些缺陷通常导致设备故障、项目延误和成本超支。这项研究将提高工业生产力，提供急需的科学支持的知识和程序方面的PTMT和管道爆破技术在寒冷地区。

Pilot Tube Microtunneling (PTMT) and Pipe Bursting are effective trenchless technologies for underground pipeline installation and rehabilitation. These trenchless techniques are ideal for environmentally sensitive locations, busy urban cores and mature neighbourhoods, where small construction footprints and efficient project delivery are essential for minimizing disruption to surrounding businesses and residents. The City of Edmonton-Drainage services has employed both PTMT and Pipe Bursting for pipeline installation and rehabilitation projects throughout the city; however, limited scientific knowledge on rather young trenchless techniques has associated their application with lots of challenges and unanswered questions. In addition, Alberta's unique cold climate imposes high depths of cover for underground infrastructure, which in turn has presented extra challenges. The University of Alberta, in collaboration with the City, intends to investigate and identify these challenges and develop effective strategies to mitigate their frequency and/or impact. Researchers will use data from past and current City PTMT and Pipe Bursting projects to identify and categorize risk events, and use this information to develop strategies to circumvent risks. Based on preliminary research and understanding, there is a deficiency of verified models and procedures to accurately predict jacking forces for PTMT projects and pull forces and surface ground movement for Pipe Bursting projects. These deficiencies commonly lead to equipment failure, project delays and cost overruns. This study will enhance the productivity of industry by providing much needed scientifically backed knowledge and procedures with respect to PTMT and Pipe Bursting techniques in cold regions.