Issue link: http://uwashington.uberflip.com/i/742071
18 Pacific Northwest Transportation Consortium • Project: Development of a Laboratory Procedure for Measuring the Effectiveness of Dust Control Palliatives • PI: David Barnes (UAF), dlbarnes@alaska.edu Dust control in many rural communities is becoming a priority. Since commencement of research on controlling dust in rural regions, rural residents have begun to understand how controlling dust can reduce the negative environmental impact and improve their and their community's quality of life. The loss of the fine soil fraction has created a public health and safety issue nationwide, and as the unending supply of dust clouds are being generated from untreated gravel roads or runways, the problem from the loss of the surface fines is at work too, by accelerating the deterioration until the road is rendered unusable. Maintaining these surfaces to operable condition has its own budgetary and financial challenges as the need for additional resources are required to combat the soil erosion of the gravel surfaces to pay for imported materials such as crushed aggregates, which needs to be mined, processed, transported, and placed into service. The overall objective of this research is to finalize the development of a laboratory test procedure for evaluating different dust control formulations and concentration levels needed to effectively control the airborne suspension of fine particles of a soilÐaggregate sample in the size range of 10 µm or less (i.e. dust, or fines). We will work with the AKDOT&PF to take the results from this research (by developing and validated a formal testing protocol) for adoption by AASHTO Subcommittee on Materials (SOM) to be initially published as a AASHTO Provisional Test Method (for a minimum 2Ðyear period) before it can be balloted for conversion to a Full Standard Test Method. Project: Benchmarking and Safety Assessment for Modified Lateral Spreading Design Procedure Using Three-Dimensional Nonlinear Finite PI: Christopher McGann (WSU), muhuntha@wsu.edu Liquefaction-induced lateral spreading is a critical design consideration for many bridges in high- seismicity regions of the Pacific Northwest with broad impacts on safety for the general public. The bridge design procedures currently used in the region tend to account for the effects of lateral spreading on the bridge and foundations with a simplified analytical approach based on a two- dimensional (2D) description of the site geometry. This type of approach captures the general impact of the lateral spreading event on the bridge components in a conservative manner, but due to the omission of many key details (e.g., three-dimensional soil deformation, foundation pinning effects), the use of such an approach may result in overly conservative and expensive design solutions. The purpose of this proposed project is to verify the safety of bridge foundations designed with an improved/modified lateral spreading design procedure using nonlinear 3D finite element models. A modified design procedure that is part of the focus of this proposed work has been developed as a means to more appropriately consider the relevant aspects of the laterally-spreading bridge- foundation-soil system. This procedure has been shown to be effective in its intended purpose of reducing some of the excessive conservatism associated with more simplified design approaches, however, there has only been limited testing and analysis to verify and benchmark the relative safety of the resulting design solutions for a wide range of bridges, foundations, and soil conditions.