Banca de DEFESA: WILSON RAMOS ARAGÃO JÚNIOR

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : WILSON RAMOS ARAGÃO JÚNIOR
DATE: 21/02/2022
TIME: 14:00
LOCAL: Auditório Pós-Graduação em Engenharia Civil on line
TITLE:

Analysis of the behavior of embankment slopes stabilized with retaining structure in cable- stayed beams and deep sub-horizontal drainage – Pernambuco, Brazil

KEY WORDS:

Embankment, Stabilization, Instrumentation, Monitoring

PAGES: 120
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

The general objective of this paper was to study the behavior of an embankment slope stabilization with a retaining structure in cable-stayed beams and deep sub-horizontal drainage. The slopes were built with sedimentary soils from the Barreiras formation with a maximum height of 27.50 m and an inclination of 1V:1.5H, located in the Metropolitan Region of Recife, Pernambuco-Brazil. The geotechnical properties of the embankment materials were determined from extensive field and laboratory investigations. The stability analysis of the embankment with the parameters obtained from the experimental campaign showed a Safety Factor close to 1. Besides, the instrumentation of the Embankments, using inclinometers, pointed to a constant movement over time. Therefore, the need for structural stabilization of the Embankments was verified. The solution adopted was through a retaining structure in cable-stayed beams and deep sub-horizontal drains. The number of rows of tie rods per slope varied between two and four, with a horizontal spacing of 2.40 m between tie rods and executed with an inclination of 45o tothe face of the slope. The load of the tie was transmitted to the massif through reinforced concrete beams (1.70 x 0.40 x 14.40 m). The sub-horizontal drainage (DHP) was excepted in two lines with a horizontal spacing of 4.80 meters and an inclination of 5o or 3o. In total, 451 tie rods were executed. It is noteworthy that during the building, modifications were made to the project, with some lines of tie rods being removed and a sheet pile solution being carried out in the stretch of one of the embankments. The monitoring program implemented during the execution of the building had instruments for monitoring the vertical displacements on the surface (27 superficial landmarks), horizontal displacements in depth (15 inclinometers), water level of the massif (6 water level meters), pore pressure at the installed point (5 piezometers) and load on the tie rods (7 load cells). In general, it was found that, after the implementation of the containment structure, there was a tendency to stabilize the movement, noted by the reduction in the speed of displacements.

BANKING MEMBERS:
Externo à Instituição - MAURICIO EHRLICH - UFRJ
Externo à Instituição - RICARDO NASCIMENTO FLORES SEVERO - IFRN
Presidente - 1130440 - ROBERTO QUENTAL COUTINHO