scholarly journals Experimental Study of the Behavior of Rectangular Excavations Supported by a Pipe Roof

2019 ◽  
Vol 9 (10) ◽  
pp. 2082 ◽  
Author(s):  
Xiongyao Xie ◽  
Mingrui Zhao ◽  
Isam Shahrour
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Experimental Tests ◽  
Soil Pressure ◽  
Sand Soil ◽  
Soil Settlement ◽  
Effective Role ◽  
The Stability ◽  
Pressure Analysis

This paper presents an experimental investigation of the role of pipe-roofs in the improvement of the stability of rectangular excavations constructed using pipe-roof technology. This technology is suitable for the construction of underground passages in crowded areas subjected to high requirements concerning soil settlement and stability during excavation construction. The design of a rectangular pipe-roof excavation required an understanding of the interaction between the soil, the pipe-roof and the excavation. This interaction is complex and plays an important role in the features of the pipe roof excavation. This paper presents a series of 1g physical experimental tests conducted in dry sand soil with an advanced monitoring system, which allows tracking of the soil settlement, the pipe deformation and the soil pressure. Analysis of these tests shows the effective role of the pipe-roof in reducing both the soil settlement and the soil pressure on the excavation. It also shows the influence of pipes on the deformation mechanism of the soil and its evolution from low deformation to the instability phase.

Experimental investigation of the stability of clinopyroxene in mid-ocean ridge basalts: The role of Cr and Ca/Al

Lithos ◽  
2017 ◽  
Vol 274-275 ◽  
pp. 240-253 ◽  
Author(s):  
Martin Voigt ◽  
Laurence A. Coogan ◽  
Anette von der Handt
Keyword(s):  
Experimental Investigation ◽  
Mid Ocean Ridge ◽  
The Stability ◽  
Ocean Ridge

An Experimental Study of the Stability of an Externally Pressurized, Gas-Lubricated Thrust Bearing

1966 ◽  
Vol 33 (1) ◽  
pp. 25-30 ◽  
Author(s):  
L. Licht ◽  
H. G. Elrod
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Thrust Bearing ◽  
Accurate Determination ◽  
Experimental Program ◽  
The Subject ◽  
The Stability ◽  
Stability Limits ◽  
Prior Analysis

The subject of this experimental investigation is the phenomenon of self-excited vibrations occurring in externally pressurized, gas-lubricated bearings. The experimental program pursued here is guided by predictions based on prior analysis. An apparatus is designed and instrumented to provide for the variation of governing parameters and for the accurate determination of their critical values. Stability bounds are obtained for a circular thrust bearing and the experimental results are compared and contrasted with previously reported, theoretical stability limits.

Drying of Industrial Ceramic Bricks: An Experimental Investigation in Oven

2014 ◽  
Vol 353 ◽  
pp. 116-120 ◽  
Author(s):  
G. Silva Almeida ◽  
M.A.F. Barbosa Fernandes ◽  
J.N. Ferreira Fernandes ◽  
Gelmires Araújo Neves ◽  
W.M.P. Barbosa de Lima ◽  
...  
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Atmospheric Pressure ◽  
Experimental Tests ◽  
Drying Rate ◽  
Drying Process ◽  
Clay Brick ◽  
Constant Weight ◽  
Rate Period ◽  
Temperature Constant

The purpose of this paper is to present an experimental study of clay brick drying. For the drying experiments, industrial holed bricks were dried in an oven under controlled conditions of velocity, temperature (constant and variable) and relative humidity of air. The continuous drying experiments ended when the mass reached constant weight. Experimental tests were performed under atmospheric pressure. Results of the drying and heating kinetics and volume variations during the process are shown and analyzed. It was verified that the drying process happens in the falling drying rate period, and air temperature has large influence in the drying rate during process. It was verified that the largest temperature, moisture content and stress gradients are located in the vertexes of the brick.

scholarly journals THE ROLE OF REVIEWING BUILDING STRUCTURES TO FULFILL REQUIREMENTS FOR STIFFNESS, STABILITY AND STRENGTH OF BUILDING STRUCTURES

2020 ◽  
Vol 2 (01) ◽  
pp. 1-16
Author(s):  
Nusa Setiani Triastuti ◽  
Indriasari Indriasari
Keyword(s):  
Retaining Wall ◽  
Secondary Data ◽  
Shear Walls ◽  
Building Structures ◽  
Building Structure ◽  
Soil Pressure ◽  
Structural Requirements ◽  
Design Structure ◽  
The Stability

Indonesia at the location of the earthquake All building structures must meet the structural requirements, namely stiffness, stability, strength. Review structures before building are built determine whether they meet the requirements Methodology Case studies based on secondary data. from the design consultant  The author analyzes with the help of structure software. The purpose of this research is to make sure the building structure meets the structural requirements before it is built. The author conducted a design review based on the Indonesian Code (SNI) Desain consultant data  , building structure is still twist in shape mode 1 and 2 after checking in software. Then the authors review and improve mainly dimensions, reinforcement columns and add shear walls. As a result of the addition of shear walls and column changes, the structure meets the requirements of strength, stiffness and stability. Building structure does not occur twist in shape modes 1 and 2. That is the role of design structure review before it is built. To increase the stability of the structure at the bottom of the stairs out towards the back is given a retaining wall, overcoming the horizontal direction of active soil pressure, ground water and surface water from the direction of the hill.

scholarly journals The Role of Porosity on the Mechanical Resistance of the Rock of a Monument: The Case of the Punic Caves in El Haouaria

2019 ◽  
Vol 9 (2) ◽  
pp. 4150-4156
Keyword(s):  
Experimental Tests ◽  
Water Retention Curve ◽  
Mechanical Resistance ◽  
Technical Solution ◽  
Compression Tests ◽  
North East ◽  
The North ◽  
Water Property ◽  
The Stability

This paper aims to investigate experimentally the role of the variable internal porosity on mechanical resistance and water retention curve as a main hydraulic property. The rock, object of our study, belongs to the caves of El Haouaria are located on the seacoast of the North East of Tunisia. Actually, the caves contain series of cracks with different types, which need a technical solution to improve the caves and avoid the collapse risk. This research might have the base issue of a technical solution So, experimental study include triaxial shear experiences and unconfined compression tests. These experimental tests were carried out in the laboratory by using several samples of rock. These samples are characterized by various types of porosity ranging nearly from 30% to 50% . Completely dried and different moisture water contents were first imposed on the rock samples, and then, separately, a series of tests were performed. The test results showed a significant effect of porosity on both retention water property and mechanical properties such as stiffness, compression and shear resistance. Moisture water content in the rock has an influence on its resistance and the successively imposed drying-wetting cycles was at the origin of porosity increase and consequently the environmental hydraulic were the main origin of the reduction of rock resistance. From this experimental investigation, the stability of the caves can only be studied through experiments. As shown above our work relied mainly on lab experiments. The stady of the cave stability passes necessarily by the study of the rock and the convenient improvement technique might be a solution to limit the disorders

A Statistical Study of Process Variables to Optimize a High Speed Curtain Coater: Part I

TAPPI Journal ◽  
2009 ◽  
Vol 8 (1) ◽  
pp. 20-26 ◽  
Author(s):  
PEEYUSH TRIPATHI ◽  
MARGARET JOYCE ◽  
PAUL D. FLEMING ◽  
MASAHIRO SUGIHARA
Keyword(s):  
Boundary Layer ◽  
Experimental Design ◽  
High Speed ◽  
Statistical Study ◽  
Process Variables ◽  
High Speeds ◽  
The Stability ◽  
Air Removal ◽  
Removal System

Using an experimental design approach, researchers altered process parameters and material prop-erties to stabilize the curtain of a pilot curtain coater at high speeds. Part I of this paper identifies the four significant variables that influence curtain stability. The boundary layer air removal system was critical to the stability of the curtain and base sheet roughness was found to be very important. A shear thinning coating rheology and higher curtain heights improved the curtain stability at high speeds. The sizing of the base sheet affected coverage and cur-tain stability because of its effect on base sheet wettability. The role of surfactant was inconclusive. Part II of this paper will report on further optimization of curtain stability with these four variables using a D-optimal partial-facto-rial design.

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