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

导管式微隧道技术和爆管技术是地下管线安装和修复的有效非开挖技术。这些非开挖技术非常适合于环境敏感的地点、繁忙的城市核心和成熟的居民区，在这些地方，施工占地面积小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使用了PTMT和管道爆裂；然而，对相当年轻的非开挖技术的科学知识有限，使其应用面临许多挑战和悬而未决的问题。此外，艾伯塔省独特的寒冷气候使地下基础设施覆盖深度很高，这反过来又带来了额外的挑战。艾伯塔大学打算与该市合作，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和管道爆裂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。在前期研究和了解的基础上，缺乏能够准确预测PTMT工程顶力和爆管工程拉力和地表移动的验证模型和方法。这些缺陷通常会导致设备故障、项目延误和成本超支。这项研究将通过提供寒冷地区PTMT和爆管技术方面亟需的科学支持的知识和程序来提高工业生产率。

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.