Risk assessment and mitigation development for HDD construction

水平定向钻（HDD）是建设输电基础设施的一种有效方法，可最大限度地减少对环境、地表和地下基础设施、野生动物和社区的影响。此外，HDD经常减少施工时间，并允许在任何季节施工。然而，与地下条件下施工相关的常规挑战和未知因素使HDD项目面临众多施工风险和计划外事件，导致重大进度延迟和成本超支。 该大学和The Crossing Company建立了合作研究伙伴关系，进行全面的风险研究，使用已完成的HDD项目的物理数据，以确定尽可能多的与HDD建设相关的风险类别。拟议的研究计划将建立在2011年进行的初步研究中获得的知识基础上，并将通过进行定量风险分析和制定HDD项目的风险缓解策略来提供更多的见解。监测和控制高环空压力的缓解策略和模型，以及在不同地面条件下准确预测回拉力的方法，将有助于HDD的规划和施工阶段，从而在建议的预算和进度下成功安装生产线。两名博士和两名硕士生和两名博士后研究员将作为拟议的研究计划的结果进行培训。拟议研究的成果将包括HDD指南和安装模型。拟议的研究将提高加拿大和国际HDD行业的成功和生产力，促进加拿大成为该领域的领导者。

Horizontal Directional Drilling (HDD) is an effective means of constructing transmission infrastructure that minimizes the impact on the environment, surface and subsurface infrastructure, wildlife and communities. In addition, HDD often reduces construction time and allows for construction in any season. However, the routine challenges and unknowns associated with construction in underground conditions have tied HDD projects with numerous construction risks and unplanned events resulting in significant schedule delays and cost over-runs. The University and The Crossing Company have established a collaborative research partnership to conduct a comprehensive risk study that uses the physical data from completed HDD projects to identify as many risk categories associated with HDD construction as possible. The proposed research program will build upon the knowledge gained from a preliminary study conducted in 2011 and will provide more insight by conducting quantitative risk analysis and developing risk mitigation strategies for HDD projects. Mitigation strategies and models to monitor and control high annular pressures and accurately predicting pull-back forces in varying ground conditions will aid in the planning and construction stages of HDD allowing for successful installations of product line under proposed budgets and schedules. Two PhD and two MSc students and two postdoctoral fellows will be trained as a result of the proposed research program. Deliverables from the proposed study will include HDD guidelines and installation models. The proposed research will enhance the success and productivity of the HDD industry in Canada and internationally, promoting Canada as a leader in this field.