Papers by Keyword: Piles

Abstract: Modern geotechnical construction has a wide range of technologies in its toolkit. Use of the Piles, manufactured with the help of different available technologies, represents one of the ways of the underground structures utilization at the objects zero level construction. The following basics shall be observed during zero cycle design and construction: 1) interactivity; 2) engineering viability; and cost efficiency. First principle suppose that interactivity utilization at the design is compulsory. This means: “initial design – test area – revised design”. It is necessary to adhere to the second principle for each of the elements of the formula given above. To ensure this, there are considered three and more Piles types (Bored Piles and Inclined Piles) in the initial design. It was determined that use of the Inclined Piles with multi point widening manufactured according to the Electric-Discharge Technology (EDT) is more preferable in comparison with the other Piles types. In effect, being Inclined Piles with the adjustable Holding Power, they have competitive advantages versus any other Pile. Therefore, use of the EDT Inclined Piles in the geotechnical construction after the interactive design has engineering viability and is a cost efficient way of underground structures construction.

Abstract: The foundation of the reinforced concrete arch bridge beams of Tukad Pekerisan and Tukad Penet (Pekerisan River and Penet River) Bali, were first designed to use well foundation on a rock soil adapted to the boring results. However, at the time of excavation, the base soil was founded to have textures that contain of both longitudinal and transverse cracks. The fractures were found to form a rectangular pattern and continued down to the layer of soil. It was feared that the slope will not be strong enough and could collapse. The purpose of this study is to determine the strength and stability of the bore piles foundations of reinforced concrete arch bridge, in order to avoid the possible collapse of the banks on the bridge foundation. The alternative of bore piles as underpinning were selected by considering the field problems, such as the elongated soil crack sand a very steep slope of soil near the construction.

Abstract: Temperature effect has a great effect on the force and deformation of bridge abutments, piles and filling at back abutment of jointless bridges. It’s necessary to definitude calculation model when using the finite element method to analyze these matter, but there is still no scientific approach to design jointless bridges. A method that solving internal forces of piles of jointless bridges under the action of temperature using ordinary differential equations is advanced in this paper. Differential equation of each rod of jointless bridges is established based on material mechanic, and then all differential equations form a differential systems. The internal force and deformation of the bridge are getted by solving differential equations based on boundary conditions, deformation coordination of rod coupling points and internal force equilibrium conditions, which is clear and definite.

Abstract: According to the engineering characteristics,the project was divided into four typical operating conditions,the deformation rules of deep foundation pit at subway station in tunneling are studied with the method of FLAC3D numerical simulation,the supporting structures choose by the bored piles and interior support. The analysis of the horizontal deformation of the retaining structures,the axial force changes of steel support,the settlement law and the influence sphere of surrounding soil. For installation of prop structures on the performance of deep excavations is investigated through numerical analysis with site specific subsurface conditions,The conclusion in this paper can provides reference for the reasonable design and safety construction of deep foundation pit.

Abstract: Taking the limestone and siliceous rocks as coarse aggregates to mix concrete,through normal pressure steam curing and autoclave curing,the concrete compressive strength after demould and compressive strength after autoclave curing are tested.The results indicate that the concrete compressive strength increases obviously after normal pressure steam curing when taking the limestone and granite as coarse aggregates,and the strength increasing laws are basically in accordance.However,the concrete compressive strength is great different after autoclave curing when taking the limestone and granite as coarse aggregates,the concrete strength increases lower with limestone as coarse aggregate,but the concrete strength increases higher with siliceous rocks as coarse aggregate.