Keywords: Fondation ; Mur de soutenement ; Pieux ; Capacite portante ; Ancrage ; Dimensionnement Reference Record created on 2004-09-07, modified on 2016-08-08

The structural calculation methods of the conduits that cross the embankment dams can be divided into two approaches. On the one hand, the estimation of the earth’s characteristics is done by the multiparameter subgrade model, and on the other hand, the usual finite element software describes the parameters of the earth based on the modulus of elasticity. The conduits have a moment of inertia value for the cross section that is combined with the modulus of elasticity of the material (concrete, steel) resulting in a great rigidity to the assembly. This stiffness, quantified in the stiffness matrix, is much higher than the rigidity of the soil. This work goes in two directions: on the one hand, it argues that the complex methods of calculating the soil characteristics are not relevant for conduits that cross the embankment dams. Second in the longitudinal direction, the conduit has joints that diminish the rigidity of the assembly and whose effect cannot be included in the FEM calculation, as it is usually done in a plane strain model. A calculation method is proposed that contains an inertial moment adjustment that takes into account joints. Finally, a computational method is used in which FEM is used with the empirically estimated momentum variation.

/pdf/bottom-discharge-conduit-for-embankment-dams-4j8cup1k83.pdf

Foundation analysis and design

Bottom Discharge Conduit for Embankment Dams

Influence of flocculant on flow behavior and undrained shear strength of fine coal refuse

Draglines are presented in this paper as an alternative for mine reclamation in steep sloping areas. Some abandoned mines in steep sloping areas of Kentucky have unreclaimed slopes which pose safety problems, as well as environmental and aesthetic problems. In add it ion, many active mines in steep sloping areas of Kentucky have slopes which must be reclaimed in the near future. Current methods of slope reclamation in Kentucky typically involve traditional heavy equipment. The current methods are not cost efficient in some cases. and are not safe in some applications. The paper includes a history of draglines. Early development is summarized, and major improvements are discussed. Unreclaimed acreage in Kentucky and the mining and reclamation methods traditionally used for strip mines in Kentucky are discussed. The engineering feasibility of draglines is discussed. Bearing capacity and slope stability are presented as factors which influence the engineering feasibility of draglines in steep sloping areas. A presumptive value of hearing capacity for a typical spoil bank is calculated. The factor of safety against slope stability failure is dis cussed. A reclamation method which minimizes the risk of bearing or slope stability failures is presented. The economic feasibility of dragline reclamation is also presented. The initial cost and production costs of dragline equipment is compared to the initial cost and production costs of other reclamation equipment. In addition, the ncrescent" scraper system is introduced as an alternative to conventional dragline bucket and line Systems. A drag line equipped with a "Crescent11 scraper system can reclaim very long slopes in steep areas which were previously considered unfeasible for

/pdf/the-feasibility-of-draglines-for-mine-reclamation-4gmqx6n6pk.pdf

The Feasibility of Draglines for Mine Reclamation

XIII CHAPTER 1: INTRODUCTION 1,1 Background of the Study L2 Objectives of the Study 1,3 The Research Scheme 1.4 The Thesis Laoout CHAPTER 2: LITERATURE REVIEW 2,1 Bearing Capacity of Foundations 2,2 Bearing Capacity of an Individual Pile 2,2, I End Bearing of Piles in Cohesive Soils 2,2, 1,1 Meyerhof's Deep Foundation Solution 2.2, I ,2 Skempton's Bearing Capacity Factors for Piles

Axial load capacity of cast-in-situ bored piles in stiff Dhaka clay

Stormwater quantity control is an important issue that needs to be addressed in roadway and ancillary transportation facility design. Pervious concrete has provided an effective solution for storm runoff for parking lots, sidewalks, bike trails, and other applications. It should be readily adaptable for use on roadway shoulders. Being a relatively new material for use in pavement for roadways, there is a lack of knowledge of the strength and behavior of pervious concrete slabs. While standard procedures for rigid pavement design with Portland cement concrete have been recommended, there are fundamental differences with pervious concrete pavement. These include a variation in concrete strength and stiffness through the depth of a slab and differences in the subgrade. Also, the main concern for a shoulder is the need to withstand wheel loadings from encroaching truck traffic. Both the strength of the pervious concrete pavement and the interface with the mainline pavement must be evaluated. Typically, tiebars are used at the interface to connect the shoulder and mainline slabs. The capacity and durability of pervious concrete at the tiebars is unknown, and steel reinforcing may not be an option with pervious systems. While full-scale testing of pervious concrete pavement is desirable, a preliminary evaluation can be performed quickly and economically through computer simulation. The Finite Element Method is a proven technique for the evaluation of solids and structures. With this approach, a number of loading scenarios can be applied to various pavement configurations to determine pavement capacity and evaluate the importance of connections with tiebars. The results of these analyses can be used to guide a full-scale testing program and help develop design procedures.

Foundation analysis and design

Citations

Bottom Discharge Conduit for Embankment Dams

Influence of flocculant on flow behavior and undrained shear strength of fine coal refuse

The Feasibility of Draglines for Mine Reclamation

Axial load capacity of cast-in-situ bored piles in stiff Dhaka clay

Finite Element Evaluation of Pervious Concrete Pavement for Roadway Shoulders

Related Papers (5)

Soil mechanics in engineering practice

Theoretical Soil Mechanics

Pile Foundation Analysis and Design

Principles of Foundation Engineering

Analysis of Ultimate Loads of Shallow Foundations