Earth Pressure Distribution and Sand Deformation Around Modified Suction Caissons (MSCs) Under Monotonic Lateral Loading

An induced trench installation was instrumented to monitor earth pressures and settlements during construction. Some of the unique features of this case study are as follows: (a) both contact and earth pressure cells were used; (b) part of the culvert is under a new embankment and part was installed in a wide trench within an existing embankment; (c) a large stockpile was temporarily placed over the induced trench; and (d) the compressible material was placed in two stages. The maximum vertical pressure measured in the field at the crown of the culvert was 0.24 times the overburden pressure. The maximum horizontal pressure measured on the side of the culvert at the springline was 0.45 times the overburden pressure. The column of soil directly above the compressible zone settled approximately 40% more than did the adjacent fill. The field results at the crown and springline compared reasonably with those observed with numerical modeling. However, the overall pressure distribution on the pipe was expected to be nonuniform, the average vertical pressure calculated by using numerical analysis on top of the culvert over its full width was 0.61 times the overburden pressure, and the average horizontal pressure calculated on the side of the culvert over its full height was 0.44 times the overburden pressure. When the full pressure distribution on the pipe is considered, the recommended design loads from the Marston–Spangler theory slightly underpredict the maximum loads, and the vertical loads control the design.

Download Full-text

Study on the earth pressure distribution of excavation chamber in EPB tunneling

Geotechnical Aspects of Underground Construction in Soft Ground ◽

10.1201/9780203879986.ch43 ◽

2008 ◽

Author(s):

T Song ◽

S Zhou

Keyword(s):

Pressure Distribution ◽

Earth Pressure ◽

The Earth

Download Full-text

Investigating the Effects of Local Contact Loss on the Earth Pressure Distribution on Rigid Pipes

Geotechnical and Geological Engineering ◽

10.1007/s10706-012-9580-8 ◽

2012 ◽

Vol 31 (1) ◽

pp. 199-212 ◽

Cited By ~ 5

Author(s):

Sherif Kamel ◽

Mohamed A. Meguid

Keyword(s):

Pressure Distribution ◽

Earth Pressure ◽

The Earth ◽

Local Contact

Download Full-text

The equivalence of a jointed shield-driven tunnel lining to a continuous ring structure

Canadian Geotechnical Journal ◽

10.1139/t00-107 ◽

2001 ◽

Vol 38 (3) ◽

pp. 461-483 ◽

Cited By ~ 81

Author(s):

K M Lee ◽

X W Ge

Keyword(s):

Pressure Distribution ◽

Joint Stiffness ◽

Earth Pressure ◽

Horizontal Displacement ◽

Internal Force ◽

Ring Structure ◽

Tunnel Lining ◽

Bending Rigidity ◽

Continuous Ring ◽

Soft Clays

This paper presents a new method of determining the correction factor to approximate a jointed, shield-driven tunnel lining as a continuous ring structure under plane strain conditions. An earth pressure distribution pattern is proposed which is developed based on the long-term behavior of shallow tunnels constructed in soft clays as observed in the field. The "force method" was used to determine the internal forces and displacements of jointed, shield-driven tunnels. Either the vertical or the horizontal displacement of the tunnel lining can be used as a common matching parameter. Factors such as joint stiffness, soil resistance, joint distribution, number of joints, and tunnel geometry can be considered by the proposed method. Simplified design equations for the estimation of equivalence factors are also proposed for the typical tunnel lining geometry of urban subway tunnels. The proposed equivalence method was evaluated by comparing it with the results of laboratory tests.Key words: shield-driven tunnel, jointed segmental lining, effective bending rigidity ratio, equivalence factor, lining internal force, earth pressure distribution.

Download Full-text

Field performance, centrifuge testing, and numerical modelling of an induced trench installation

Canadian Geotechnical Journal ◽

10.1139/t07-086 ◽

2008 ◽

Vol 45 (1) ◽

pp. 85-101 ◽

Cited By ~ 38

Author(s):

Rodney P. McAffee ◽

Arun J. Valsangkar

Keyword(s):

Numerical Modelling ◽

Pressure Distribution ◽

Earth Pressure ◽

Field Performance ◽

Overburden Pressure ◽

Centrifuge Testing ◽

Geotechnical Centrifuge ◽

Earth Pressures ◽

Prototype Structure ◽

Box Culvert

The field performance of an induced trench installation is compared to the results of centrifuge testing and numerical modelling. The measured vertical pressure at the crown of the pipe in the field ranged from 0.24 to 0.36 times the overburden pressure. The horizontal earth pressures measured in the field at the springline level determined a coefficient of lateral earth pressure between 0.39 and 0.49. The culvert was monitored over a period of 2 years following completion of embankment construction indicating no measurable changes in earth pressures and deformations. A model box culvert simulating the prototype height of soil cover, the pipe width, and the thickness of the compressible layer was tested using a geotechnical centrifuge. The prototype structure was also evaluated using numerical modelling to predict full earth pressure distribution and deformations. A comparison of field data, centrifuge testing, and numerical modelling shows that the Marston–Spangler theory used in designing induced trench culverts is conservative. The theory however, does not address or predict the nonuniform pressures on the top, sides, or bottom of the pipe, and therefore numerical analysis should be used to estimate the complete pressure distribution.

Download Full-text

Parametric Study of Sheet Pile Wall using ABAQUS

Civil Engineering Journal ◽

10.28991/cej-2021-03091638 ◽

2021 ◽

Vol 7 (1) ◽

pp. 71-82

Author(s):

Taku Muni ◽

Dipika Devi ◽

Sukumar Baishya

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Pressure Distribution ◽

Earth Pressure ◽

Sheet Pile ◽

Passive Earth Pressure ◽

Element Analysis ◽

The Earth ◽

Wall Deformation ◽

Sheet Pile Wall

In the present study two-dimensional finite element analysis has been carried out on cantilever sheet pile wall using ABAQUS/Standard software to study the effect of different friction angles and its related parameters such as dilation angle, the interfacial friction coefficient between soil-wall on earth pressure distribution, and wall deformation. From the results obtained, it is found that there is a significant decrease in wall deformation with an increase in the angle of internal friction and its related parameters. The earth pressure results obtained from the finite element analysis shared a unique relationship with that of a conventional method. Both the results showed similar linear behavior up to a certain percentage of wall height and then changed drastically in lower portions of the wall. This trend of behavior is seen in both active as well as in passive earth pressure distribution for all the frictional angle. Hence, after comparing the differences that exist in the results for both methods, from the analysis a new relationship between the earth pressure coefficients from a conventional method and the finite element method has been developed for both active and passive earth pressure on either side of the sheet pile wall. This relationship so derived can be used to compute more reasonable earth pressure distributions for a sheet pile wall without carrying out a numerical analysis with a minimal time of computation. And also the earth pressure coefficient calculated from this governing equation can serve as a quick reference for any decision regarding the design of the sheet pile wall. Doi: 10.28991/cej-2021-03091638 Full Text: PDF

Download Full-text