The Experts below are selected from a list of 5436 Experts worldwide ranked by ideXlab platform
Gregory P. Tsinker - One of the best experts on this subject based on the ideXlab platform.
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Soil Pressure on Retaining Walls
Monitoring of Soil-Structure Interaction, 1998Co-Authors: George E. Lazebnik, Gregory P. TsinkerAbstract:It is well known that the magnitude of Soil Pressure on a retaining structure depends on the physical properties of the Soil, the geometry of the contact surface, the character of displacement (deformation) of the retaining structure under Soil Pressure, and other effects, e.g., friction between the Soil and the structure. Wall movement is a major contributor to the magnitude and distribution of Soil Pressure along the height of a wall.
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Contact Soil Pressure Measurement Techniques
Monitoring of Soil-Structure Interaction, 1998Co-Authors: George E. Lazebnik, Gregory P. TsinkerAbstract:Two basic techniques are normally used for the direct measurement of contact Soil Pressures at the interfaces between the structure and founding Soil. In one of these techniques, the contact Soil Pressures are measured by means of Soil Pressure cells installed at the interface between the Soil and the underside of the structure; in this case the Soil Pressure-bearing membrane (contact surface) of the instrument is placed flush with the exposed-to-Soil Pressure face of the structure, e.g., underside of the footing, backside of the retaining wall, tip or sides of piles, etc. In the second technique, the Soil Pressure cells are placed in the mass of Soil at some distance (usually approximately 30 to 100 mm) from the underside of the footing. Some advocates of this technique (Eidelman 1960a, b; Murzenko 1965; and others) believe that this eliminates the effects of potential Soil unevenness at the interface with a structure on readouts by Soil Pressure measurement instruments.
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Soil Pressure Measurement Methods: Measurement Specifics and Instruments
Monitoring of Soil-Structure Interaction, 1998Co-Authors: George E. Lazebnik, Gregory P. TsinkerAbstract:Normally, stresses in Soils can be measured by means of indirect or direct methods. Typically, the indirect methods involve recalculation or conversion from some other measured “indirect” parameter, for example, structure deflection, to the Soil Pressure against structure, i.e., strain into stress. One example is indirect determination of the lateral Soil Pressure exerted upon a sheetpile wall. In this case the flexural strains are carefully measured through the whole height of the wall at as many points as possible. Then the distribution of the Soil Pressure acting upon the wall is found by the numerical differentiation of the deflection or bending moment diagrams by taking, respectively, derivatives of the fourth or second order. Practical examples of this method are given in Tschebotarioff, (1948, 1973) and Lazebnik (1961c).
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Calibration Apparatuses and Calibration Methods of Soil Pressure Cells
Monitoring of Soil-Structure Interaction, 1998Co-Authors: George E. Lazebnik, Gregory P. TsinkerAbstract:An instrument reading is useful only if its correct response to the effects of the Pressure it is exposed to is known. This is why prior to installation any Soil Pressure cell must be properly calibrated; i.e., the relationship between the instrument’s output signal and the known applied load must be properly established.
Sun Jian-ping - One of the best experts on this subject based on the ideXlab platform.
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Calculation model of Soil Pressure displacement based on Mindlin solution
Rock and Soil Mechanics, 2020Co-Authors: Sun Jian-pingAbstract:The calculation model of Soil Pressure displacement is established based on Mindlin strain solution,that the difference of Soil Pressure between the calculated state and the static state is considered as the calculated distributed stress.The limited displacement of Soil under active state of plastic equilibrium and that of Soil under passive state of plastic equilibrium are both obtained with th model.The calculation program is programmed according to the calculation model to analyze the regulation of both the limited displacement of Soil under active state and that of Soil under passive state from some key parameters,including inner friction,cohesive force,calculated depth and calculated width.The measured data from a mdel test is used to illustrate the validity and rationality of the proposed model.The model can be used for calculating of Soil Pressure with different limited values of Soil displacements,so as to provide a theorical basis.
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CALCULATION MODEL OF Soil Pressure DISPLACEMENT BASED ON MINDLIN SOLUTION
Engineering mechanics, 2020Co-Authors: Sun Jian-pingAbstract:The lateral displacement of composite Soil nailing is a key parameter for design,but the calculation method is not specified in the code.This paper adopts the assumption that the final lateral displacement of the composite Soil nailing wall is the sum of the micro-pile deformation under partial Soil Pressure and the pull-out deformation of Soil nail in its effective range,and the former is equivalent to that of a multi-span beam under partial Soil Pressure.Then the calculation model of the lateral Soil Pressure applied to the micro-pile is proposed by the magnitudes of the horizontal stiffness of the Soil nail and the micro-pile.The formula of horizontal stiffness coefficient of Soil nailing is derived,which is mainly affected by the shear deformation coefficient among the nailing Soil at the corresponding position and the Soil nail length(L1) outside the potential sliding surface.The horizontal stiffness coefficient of the micro-pile is calculated as per the cantilever beam or lateral load bearing pile.Some parameters presented in practical calculation method of Soil nailing displacement are discussed including Soil Pressure style,shear displacement coefficient and calculation method of overall stability.One engineering example is used to demonstrate the validity of the proposed method.With the result derived from pullout tests,the practical calculation method can serve as a theoretical basis in the predictive control of Soil nailing displacement.
George E. Lazebnik - One of the best experts on this subject based on the ideXlab platform.
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Soil Pressure on Retaining Walls
Monitoring of Soil-Structure Interaction, 1998Co-Authors: George E. Lazebnik, Gregory P. TsinkerAbstract:It is well known that the magnitude of Soil Pressure on a retaining structure depends on the physical properties of the Soil, the geometry of the contact surface, the character of displacement (deformation) of the retaining structure under Soil Pressure, and other effects, e.g., friction between the Soil and the structure. Wall movement is a major contributor to the magnitude and distribution of Soil Pressure along the height of a wall.
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Contact Soil Pressure Measurement Techniques
Monitoring of Soil-Structure Interaction, 1998Co-Authors: George E. Lazebnik, Gregory P. TsinkerAbstract:Two basic techniques are normally used for the direct measurement of contact Soil Pressures at the interfaces between the structure and founding Soil. In one of these techniques, the contact Soil Pressures are measured by means of Soil Pressure cells installed at the interface between the Soil and the underside of the structure; in this case the Soil Pressure-bearing membrane (contact surface) of the instrument is placed flush with the exposed-to-Soil Pressure face of the structure, e.g., underside of the footing, backside of the retaining wall, tip or sides of piles, etc. In the second technique, the Soil Pressure cells are placed in the mass of Soil at some distance (usually approximately 30 to 100 mm) from the underside of the footing. Some advocates of this technique (Eidelman 1960a, b; Murzenko 1965; and others) believe that this eliminates the effects of potential Soil unevenness at the interface with a structure on readouts by Soil Pressure measurement instruments.
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Soil Pressure Measurement Methods: Measurement Specifics and Instruments
Monitoring of Soil-Structure Interaction, 1998Co-Authors: George E. Lazebnik, Gregory P. TsinkerAbstract:Normally, stresses in Soils can be measured by means of indirect or direct methods. Typically, the indirect methods involve recalculation or conversion from some other measured “indirect” parameter, for example, structure deflection, to the Soil Pressure against structure, i.e., strain into stress. One example is indirect determination of the lateral Soil Pressure exerted upon a sheetpile wall. In this case the flexural strains are carefully measured through the whole height of the wall at as many points as possible. Then the distribution of the Soil Pressure acting upon the wall is found by the numerical differentiation of the deflection or bending moment diagrams by taking, respectively, derivatives of the fourth or second order. Practical examples of this method are given in Tschebotarioff, (1948, 1973) and Lazebnik (1961c).
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Calibration Apparatuses and Calibration Methods of Soil Pressure Cells
Monitoring of Soil-Structure Interaction, 1998Co-Authors: George E. Lazebnik, Gregory P. TsinkerAbstract:An instrument reading is useful only if its correct response to the effects of the Pressure it is exposed to is known. This is why prior to installation any Soil Pressure cell must be properly calibrated; i.e., the relationship between the instrument’s output signal and the known applied load must be properly established.
Gao Deng - One of the best experts on this subject based on the ideXlab platform.
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Transfer Mechanism and Calculation of Vertical Soil Pressure Acted on Shield Tunnel in Sandy Soil Layer
2020Co-Authors: Gao DengAbstract:A trapdoor test is developed to simulate the excavation of the shield tunnel in the sandy Soil layer.The transfer mechanism of vertical Soil Pressure acted on the shield tunnel is studied.The existing lateral Pressure coefficient K in the Soil arching is summarized,compared and recommended.The test results show that the vertical Soil Pressure acted on the shield tunnel is tranfered to the adjoining stationary Soil by arching effect,and it is reduced significantly with the increasing of horizontal Soil Pressure.When the Soil arching is fully formed,the calculated vertical Soil Pressure using K=1 is close to the tested value.
Li Fang - One of the best experts on this subject based on the ideXlab platform.
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fiber bragg grating Soil Pressure sensor based on two l shaped beams
2013Co-Authors: Zhang Wentao, Du Yanliang, Li Feng, Li FangAbstract:The utility model discloses a fiber bragg grating Soil Pressure sensor based on two L-shaped beams. The fiber bragg grating Soil Pressure sensor based on the two L-shaped beams comprises a box body which is in a cake-shaped tubular structure, wherein the inner surface of the top is provided with a Pressure-bearing diaphragm which directly feels an outside Soil Pressure signal; two supporting shafts which are arranged in the box body; the two L-shaped beams which are arranged on the supporting shafts, wherein each L-shaped beam is provided with a vertical direction part and a horizontal direction part; a center dowel bar which is arranged between the Pressure-bearing diaphragm and the end parts of two horizontal direction parts; a fiber bragg grating which is arranged on the end parts of the vertical direction parts of the two L-shaped beams and detect Soil Pressure signals, wherein the longitudinal displacement of the Pressure-bearing diaphragm is transferred to the fiber bragg grating through the center dowel bar and the two L-shaped beams to enable the fiber bragg grating to produce axial strain; two extraction holes which are arranged on the side walls of two end parts of the box body; and a bottom plate which is arranged at the bottom of the box body for sealing and protecting the internal structure of the box body. According to the utility model, the fiber bragg grating Soil Pressure sensor based on double L-shaped beams solves the problems of volume, sensitivity, packaging technology and the like of the Soil Pressure sensor.
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fiber bragg grating Soil Pressure sensor based on two l type beams
2013Co-Authors: Zhang Wentao, Du Yanliang, Li Feng, Li FangAbstract:The invention discloses a fiber Bragg grating Soil Pressure sensor based on two L-type beams. The fiber Bragg grating Soil Pressure sensor comprises a box body, two supporting shafts, the two L-type beams, a central dowel bar, a fiber Bragg grating, two leading-out holes and a bottom plate, wherein the box body has a caky cylindrical structure; the inner surface of the top of the box body is provided with a Pressure-bearing diaphragm for sensing an external Soil Pressure signal directly; the two supporting shafts are arranged in the box body; the two L-type beams are arranged on the two supporting shafts; each L-type beam is provided with a vertical part and a horizontal part; the central dowel bar is arranged between the Pressure-bearing diaphragm and ends of the two horizontal parts of the two L-type beams; the fiber Bragg grating is arranged at ends of the vertical parts of the two L-type beams and is used for detecting a Soil Pressure signal; longitudinal displacement of the Pressure-bearing diaphragm is transmitted to the fiber Bragg grating through the central dowel bar and the two L-type beams to make the fiber Bragg grating generate axial strain; the two leading-out holes are formed in side walls at two ends of the box body; and the bottom plate is arranged at the bottom of the box body and is used for sealing and protecting the interior structure of the box body. The fiber Bragg grating Soil Pressure sensor based on the two L-type beams solves the problems of size, sensitivity, packaging process and the like of the conventional Soil Pressure sensor.
