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Title: Low-ground-pressure construction equipment for use in dredged material containment area operation and maintenance-equipment inventory
Authors: Green, Charles E.
Rula, Adam A.
Keywords: Construction equipment
Dredged material disposal
Soft soils
Soil strength
Publisher: U.S. Army Engineer Waterways Experiment Station
Series/Report no.: Technical Report (Dredged Material Research Program (U.S.)) ; no. D-77-1
Abstract: Sixty vehicles were evaluated to determine their capabilities for operating in and around confined dredged material disposal areas. The results represent the state of the art of vehicles that are commercially available or have undergone recent military testing and that can operate in soft soils. The vehicles were divided into six payload classes that indirectly reflect the size of the job that the vehicle or equipment may be expected to perform. Vehicle performance was expressed in terms of go-no go and traction capability on five selected soil strengths that cover the range of soil strengths measured in several dredged material disposal containment areas that are believed representative of many operational environments. The soils data revealed that the operational environment of confined dredged material disposal areas can be highly variable within a given site in terms of type of material, profile strength, presence of surface and subsurface water, and vegetal cover. These factors combine to present a very harsh operational environment for vehicles or equipment. A comparison of the computed soil strength requirements for the vehicles operating in fine-grained soils with measured soil strength data indicated that commercially available vehicles in the six categories considered can operate in all except the lowest soil strength units established. It is suggested that before the concept of using low- ground-pressure construction equipment for dredged material containment area operations can be applied with a higher level of confidence, other studies should be conducted to identify specific missions or jobs to be performed . These should identify measures of performance, evaluate current automotive and mobility technology and focus on subject problems by modification and refinement as required, describe the operational environment in engineering terms, validate performance predictions, and develop an analytical framework to account for the pertinent construction equipment-operational environment interactions. This technological base can then be used to prepare sound equipment performance criteria and/or specifications, evaluate testable specifications in quantitative terms, and design new equipment with confidence. Appendix A presents the methods used for computing soft-soil vehicle performance in some detail, with appropriate examples. Appendix B presents the effects of vehicle buoyancy in soft soil on the determination of the minimum soil strength required for travel. These appendixes were reproduced in microfiche and are enclosed in an envelope in the back cover of this report. Appendix C presents pertinent vehicle data in catalog form: several photographs or drawings , manufacturer, general vehicle data under which performance data can be found, mechanical data that include dimensions or description of major components of the vehicle, and miscellaneous data under which such information as cost (1974) and primary use is found. The limitations of the methods used to compute vehicle performance are discussed.
Description: Technical Report
Gov't Doc #: Technical Report D-77-1
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Technical Report

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