Читать реферат по геологии: "Stabilyty of Erth dam" Страница 1


назад (Назад)скачать (Cкачать работу)

Функция "чтения" служит для ознакомления с работой. Разметка, таблицы и картинки документа могут отображаться неверно или не в полном объёме!

Ministers of education and since- Farabi Kazakh National Universityof Mechanics and Mathematicsof Mechanics

Specialty: 5B060300 Mechanics REPORTMANUFACTURING PRACTICE ON THE TOPIC OF THE THESIS THEME: stability of an earth dam Student: Ospanov N. Msupervisor : Alibayeva. K. A Алматы 2015

COTENTS INTRODUCTION

. STABILTY OF AN EARTH DAM

.1 Equipment Diagrams

.2 Equipmen setup

.3 Experiment results INTRODUCTION

class of problems involving flow of water through permeable media has a wide range and is of considerable importance to engineers and scientists. The Armfield Drainage and Seepage Tank, Model S1, facilitates a detailed study of the movement of water through permeable media.engineer is probably the one who faces such problems most frequently and whose success or failure will often depend on his knowledge and understanding of phenomena related to the movement of the water in soils. This is one of the most important aspects in the design of almost all hydraulic structures. Consider an earth or rock fill dam, for instance. Water flows directly through the engineering structure itself. Obviously, it is important to know how much water we can expect to lose from the reservoir by seepage through the dam. We also need to know whether a certainkind of soil can be used to construct the dam without running the risk that the reservoir will run dry after filling. The safety and the very existence of the dam edepends on the flow pattern of the penetrating water and on the balance of the hydraulic and static forces. Many earth dams have collapsed because of improper design with respect to the movement of water through their bodies. In fact, the conditions of seepage are vital, not only for earth dams, but for any dams having permeable materials in the foundations. A dam can collapse or be badly damaged as a result of seepage underneath its bottom, or because of hydrostatic forces exerted by the penetrating waters. These forces cannot be determined without prior determination of the flow pattern underneath the structure. Once known, they can be altered using drains, cut-offs, sheet pile walls and other means to change the flow pattern.problems arise in other engineering structures built from, or on, soil. As examples, we can mention levees, road and railway embankments, canals, navigation locks, foundations of buildings, bridges, harbour walls and similar structures [1]engineering field where good understanding of water movement in soil is essential is water supply and drainage. In both we are concerned with extracting water from saturated strata by using wells, horizontal galleries, tile lines, or trenches.this type of problem, we usually deal only with the flow pattern and quantity of the water traversing the strata. The forces exerted by seepage remain of secondary importance.[2]is an area where both seepage and ground water flow is fundamentally important. The design of an effective drainage system for a mine must be based on profound knowledge of permeability, of the degree of water saturation of the various geological layers, of seepage rates and of the effect of pumping or draining the water on the balance of forces.water hydrology and hydrogeology are the main non-engineering fields dealing with flow of water through permeable media and require the study of problems such as salt water intrusion into fresh water basins, underground movement of water towards inner channels, discharge of ground water into surface run-offs, recharge of water from rivers to underground storage, artificial recharge off all practical work areas and laboratories should be covered by local safety. regulations which must be followed at all times. If required Armfield can supply a typical set of standard laboratory safety rules.Drainage and Seepage Tank has been designed to be safe in use, when installed, operated and maintained in accordance with the instructions in this manual.with any piece of sophisticated equipment, dangers may exist if the equipment is misused, mishandled or badly maintained. If the equipment is used in a manner not specified by Armfield then the protection provided by the equipment may be impaired [3].S1 is a heavy piece of equipment, and should be lifted fork lift if possible. Ensure that the arms of the fork lift do not foul the sump moulding in the base of the unit. Do not attempt to lift the unit when it is full of sand or water.

OBJECTIVE

continuing safety of an earth dam structure depends on the stability of its slopes. The stability of the slope is in turn dependent on:

. the properties of the material of which the dam is constructed;

. whether it is 'exposed' to water or air; and

. on conditions of seepage through the dam.experiment is to demonstrate the process of collapse of an improperly designed earth dam with slopes too steep for the material used. At the same time it may be noticed how the water itself adjusts a dam's surface to the steepest slope allowable for given conditions. This slope is called the critical slope.the laboratory, we have the advantage of being able to use homogeneous materials of known properties. This simplifies the problem and makes it possible to reduce the number of components involved. By this means significant relationships between the physical properties of the medium and characteristics of flow are found. To further simplify the problem, we usually restrict ourselves to a two-dimensional flow, investigating conditions in a vertical cross section* along the horizontal direction of the moving water mass. The Armfield Drainage and Seepage Tank, Model S1, is specifically designed to permit the simulation in the laboratory of such vertical cross sections [4].

1. STABILTY OF AN EARTH DAM .1 Equipment Diagrams

can see front view of our experimental equipment on the figure 1.1. 1.1: Front View of S1 Drainage and Seepage Tank (Shown with