Settlement Calculation and Analysis of the Southwest Airport High Fills Settlement

2013 ◽  
Vol 838-841 ◽  
pp. 786-790
Author(s):  
Hua Yang ◽  
Bin Xu
Keyword(s):  
Sedimentation Coefficient ◽  
Summation Method ◽  
Measured Data ◽  
One Dimensional ◽  
Settlement Area ◽  
Filling Height ◽  
Settlement Calculation ◽  
Curve Method ◽  
Final Settlement ◽  
Hyperbolic Method

This paper,according to the airport high fill measured data of Settlement, the filling height of not more than filling half the width of the settlement,is divided into central uniform settlement area and boundary affected zone; Central uniform settlement area can be regarded as one-dimensional compression state, layered summation method to calculate the theoretical final settlement value; then, according to the settlement data, using the hyperbolic method, exponential curve method to predict the final settlement, compared with the theoretical sedimentation value, thrust reversers experience in the specification formula coefficient, the ratio is the sedimentation coefficient of experience. The empirical coeffcient is 0.49~0.92.

Application of Three-Parameter Model in Settlement Calculation of Immersed Tube Tunnel

2013 ◽  
Vol 470 ◽  
pp. 298-303 ◽  
Author(s):  
Gang Wei ◽  
Qin Wei Su
Keyword(s):  
Analytical Solution ◽  
Elastic Foundation ◽  
Laplace Transformation ◽  
Correspondence Principle ◽  
Basal Layer ◽  
Measured Data ◽  
Composite Foundation ◽  
Settlement Calculation ◽  
Relationship Of ◽  
Final Settlement

The settlement of immersed tube tunnel is mainly caused by the compression of basal layer and recompression of the ground foundation layer. Defining the composite foundation as a combination of basal layer ofimmerse tube tunnel and ground foundation layer, a three-parameter model is proposed in this study to simulate the composite foundation in which the basal layer was represented using springs and the ground foundation layer by Kelvin’s model. Based on the solution of beam on elastic foundation, analytical solution for settlement of immersed tube tunnel using the proposed three-parameter model was derived by means of Laplace transformation according to the correspondence principle and the constitutional relationship of the three-parameter model. Initial and final settlement as well as variation of settlement in terms of time were calculated and compared with the actual measured data in combination with actual data measured during tunnelling of Shenjiamen immersed tube tunnel in Zhoushan City. Results showed that the proposed three-parameter model is capable of replacing the basal and ground foundation layers. The calculated value matched favourably with the actual measured value and the variation of settlement in terms of time for immerse tube tunnel can be represented.

Research of Calculation Method for Final Soft Clay Ground Settlement by Preloading Method

2014 ◽  
Vol 1065-1069 ◽  
pp. 164-167
Author(s):  
Da Gang Wang ◽  
Zhong Qiu Xie ◽  
Xi Liu ◽  
Jun Cao
Keyword(s):  
Large Scale ◽  
Soft Soil ◽  
Measured Data ◽  
Exponential Curve ◽  
Curve Method ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Preloading Method ◽  
Ultimate Settlement ◽  
Hyperbolic Method

Preloading method is a common way to dispose large-scale soft soil foundation, and its methods of calculating the settlement amount mainly include exponential curve method, hyperbolic method, and Asaoka method. This paper chose exponential curve method and hyperbolic method to conduct ultimate settlement calculation on some reclamation project of Yingkou Port against measured data of settlement in the project, and compared the result to that calculated by splitting summation method. The accuracy was also verified by measured data of settlement amount in later phase to reach the conclusion that hyperbolic method is more suitable for calculating the ultimate settlement amount considering the soft soil foundation of marine facies in Liaoning.

scholarly journals Optimization Analysis of Settlement Parameters for Postgrouting Piles in Loess Area of Shaanxi, China

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Zhijun Zhou ◽  
Shanshan Zhu ◽  
Xiang Kong ◽  
Jiangtao Lei ◽  
Tong Liu
Keyword(s):  
Compression Modulus ◽  
Summation Method ◽  
Cone Penetration ◽  
Optimization Analysis ◽  
Loess Area ◽  
Elastic Compression ◽  
Settlement Calculation ◽  
Side Resistance ◽  
Load Tests ◽  
The Relationship

The settlement calculation of postgrouting piles is complex and depends on the calculation method and parameters. Static load tests were conducted to compare the settlement characteristics of nongrouting and postgrouting piles, and three vital parameters in the layer-wise summation method were revised to predict the settlement of postgrouting piles. The elastic compression coefficient was deduced based on the Mindlin–Geddes method by considering the influence of the change in the pile side resistance distribution and end resistance ratio on the elastic compression after grouting. The relationship between the compression modulus and soil gravity stress and cone penetration resistance were established, respectively, using experimental data. The optimum value of the settlement empirical coefficient was determined using regional data. Finally, we used the postgrouting pile of the Wuqi–Dingbian expressway as a practical example. The results obtained from the layer-wise summation method after parametric optimization were close to the measured values. The results of this study provide reference data and guidance for the settlement calculation of postgrouting piles in this area.

scholarly journals Small-Scale Spectrum of a Scalar Field in Water: The Batchelor and Kraichnan Models

2011 ◽  
Vol 41 (11) ◽  
pp. 2155-2167 ◽  
Author(s):  
Xavier Sanchez ◽  
Elena Roget ◽  
Jesus Planella ◽  
Francesc Forcat
Keyword(s):  
Scalar Field ◽  
Thermal Gradient ◽  
Theoretical Models ◽  
Measured Data ◽  
Small Scale ◽  
Temperature Profiles ◽  
One Dimensional ◽  
Kraichnan Model ◽  
The One ◽  
Rate Of Dissipation

Abstract The theoretical models of Batchelor and Kraichnan, which account for the smallest scales of a scalar field passively advected by a turbulent fluid (Prandtl > 1), have been validated using shear and temperature profiles measured with a microstructure profiler in a lake. The value of the rate of dissipation of turbulent kinetic energy ɛ has been computed by fitting the shear spectra to the Panchev and Kesich theoretical model and the one-dimensional spectra of the temperature gradient, once ɛ is known, to the Batchelor and Kraichnan models and from it determining the value of the turbulent parameter q. The goodness of the fit between the spectra corresponding to these models and the measured data shows a very clear dependence on the degree of isotropy, which is estimated by the Cox number. The Kraichnan model adjusts better to the measured data than the Batchelor model, and the values of the turbulent parameter that better fit the experimental data are qB = 4.4 ± 0.8 and qK = 7.9 ± 2.5 for Batchelor and Kraichnan, respectively, when Cox ≥ 50. Once the turbulent parameter is fixed, a comparison of the value of ɛ determined from fitting the thermal gradient spectra to the value obtained after fitting the shear spectra shows that the Kraichnan model gives a very good estimate of the dissipation, which the Batchelor model underestimates.

The Settlement Analysis of the Cement Fly-Ash Gravel Pile Composite Foundation of Baotou

2014 ◽  
Vol 580-583 ◽  
pp. 518-523
Author(s):  
Juan Li ◽  
Yao Xu ◽  
Jun Yin
Keyword(s):  
Fly Ash ◽  
Composite Foundation ◽  
Settlement Calculation ◽  
Practical Engineering ◽  
Cfg Pile Composite Foundation ◽  
Modified Formula ◽  
Gravel Pile ◽  
Final Settlement ◽  
Settlement Analysis ◽  
Cfg Pile

This paper analyzes the causes of larger differences of final settlement calculated value of cement fly-ash gravel pile (CFG pile) composite foundation of Baotou with actual observed result of it. On the basis of analysis on a number of practical engineering data of Baotou, we modify the settlement formula of the CFG pile composite foundation and gain the modified coefficient applied to the settlement calculation of the CFG pile composite foundation of Baotou. The modified formula and coefficient proposed in this paper have a positive effect on the accurate settlement calculation of puting forward a more accurate correction formula and coefficient of the calculation of the CFG pile composite foundation of Baotou.

The Research on Unloading Time of Stack Preloading Based on the Measured Data

2013 ◽  
Vol 361-363 ◽  
pp. 1659-1663
Author(s):  
Ji Xin Yang ◽  
Qian Rui Liu ◽  
Zhao Da Zeng
Keyword(s):  
Measured Data ◽  
Class Level ◽  
Practical Engineering ◽  
Unloading Time ◽  
Hyperbolic Method ◽  
Subsidence Curve

Combined with practical engineering, the second-class level measured data is got via stack preloading experiment on the soft and weak railway subgrade. By using the hyperbolic method and three points method to fit subsidence curve, the post-construction settlement S (t =∞) and the settlement at any time S(t) is evaluated, then a reasonable unloading time is inferred by the comparison between S (t =∞) and S(t=180). Studies have shown that hyperbolic method and three points method can predict the post-construction settlement accurately, the time unloading six months after the stack is completed is quite reasonable.

scholarly journals A Three-Section-Settlement Calculation Method for Composite Foundation Reinforced by Geogrid-Encased Stone Columns

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Binhui Ma ◽  
Zhiyong Hu ◽  
Zhuo Li ◽  
Kai Cai ◽  
Minghua Zhao ◽  
...  
Keyword(s):  
Calculation Method ◽  
Element Model ◽  
Summation Method ◽  
Composite Foundation ◽  
Stone Columns ◽  
Engineering Practice ◽  
Space Problem ◽  
Relative Slip ◽  
Settlement Calculation ◽  
Slip Displacement

The analysis of the bearing characteristics and deformation mechanism of composite foundation reinforced with geogrid-encased stone columns is presented in order to obtain its settlement calculation method. The settlement of composite foundation is divided into three sections which are the reinforced section, unreinforced section, and underlying stratum. Based on Hooke’s law of space problem and the thoughts of the layer-wise summation method, the relative slip displacement between pile and soil of reinforced section without plastic zone is analyzed. The settlement of reinforced section is calculated by the layered iteration method based on the pile element model. The compatibility of vertical and radial deformations of unreinforced section is analyzed based on the pile-soil element model. The settlement of underlying stratum is still calculated by the layer-wise summation method. Finally, two engineering examples are analyzed and the results show that the settlement calculated by the presented method is close to the measured one. The method overcomes the defect that the calculated results by the other existing methods are more dangerous and it is more feasible and can be applied in engineering practice.

Application of Terzaghi's consolidation theory to nearly saturated soils

1994 ◽  
Vol 31 (2) ◽  
pp. 311-317 ◽  
Author(s):  
Hans H. Vaziri ◽  
Harold A. Christian
Keyword(s):  
Unsaturated Soils ◽  
Measured Data ◽  
One Dimensional ◽  
Deformation Response ◽  
Consolidation Theory ◽  
Modified Equations ◽  
Consolidation Coefficient ◽  
Soil Skeleton ◽  
Oedometer Tests ◽  
Compressibility Characteristics

Terzaghi's one-dimensional consolidation theory is modified to account for the compressibility of fluid and solid phases. The proposed modified equations can be used to analyze the consolidation response of unsaturated soils over the saturation range where the gases remain in an occluded form (generally within a range between 80 and 100aturation); however, such applications are subject to the same limitations and idealizations implicit in Terzaghi's classical consolidation theory. The purpose of this note, therefore, is to offer a simple solution and not to unravel the complexities involved in general analysis of flow and deformation response of unsaturated soils. The proposed approach involves defining the consolidation coefficient, and hence the time factor, in terms of an equivalent fluid compressibility. This equivalent fluid is assumed to represent the compressibility characteristics of all the compressible phases that constitute the soil skeleton. The proposed generalized form of Terzaghi's consolidation equations is shown to qualitatively capture the consolidation behaviour of unsaturated soils. To test the validity of the formulations presented, one-dimensional oedometer tests were performed on specimens of Lantz clay that had been prepared at different saturation levels; satisfactory agreement was achieved between the theoretical and measured data at two states of saturation. Key words : consolidation, theoretical solutions, oedometer test, compressible fluid, occluded gas.

Practical Calculation of Highway Foundation Settlement of the Yellow River Alluvial Plain

2011 ◽  
Vol 90-93 ◽  
pp. 260-263
Author(s):  
Hong Xia Yang ◽  
Zheng Rong Zhao
Keyword(s):  
Yellow River ◽  
Summation Method ◽  
Alluvial Plain ◽  
The Yellow River ◽  
Practical Calculation ◽  
Foundation Settlement ◽  
Theory Method ◽  
Actual Observation ◽  
Final Settlement ◽  
Formula Method

In order to solve the problem of great error in calculating the Yellow River alluvial plain highway’s foundation settlement with delamination summation-method and regulate formula method,we put forward the reason of calculating the final settlement by drilling standard penetration number.It is according to the principles of delamination summation-method and elastic theory method and it is combined with engineering prospecting tests results.Finally,we inference the empirical formula in calculating the final settlement by standard penetration number.The comparison of the calculation of the final settlement by drilling standard penetration number and the statistics by actual observation of jinan-heze expressway has proved the correctness of calculation formula.

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