مجموعه ای از تزهای دوره دکترا شاخه مهندسی خاک و پی به زبان انگلیسی

مجموعه ای از تزهای دوره دکترا شاخه مهندسی خاک و پی به زبان انگلیسی
این تزها مربوط به امپریال کالج لندن میباشند
Imperial College London
An investigation of the stress-strain-strength characteristics of an Eocence clay
یک تز دکترا به زبان انگلیسی به حجم 32 مگابایت
لینک دانلود: http://www3.imperial.ac.uk/portal/pls/portallive/docs/1/7941696.PDF
لینک دانلود چکیده پایان نامه: http://www3.imperial.ac.uk/portal/pls/portallive/docs/1/7943696.PDF

The Influence of Duration and the Selection and Scaling of Accelerograms in Engineering Design and Assessment
یک تز دکترا به حجم 27 مگابایت
لینک دانلود: http://www3.imperial.ac.uk/portal/pls/portallive/docs/1/7293267.PDF
چکیده: http://www3.imperial.ac.uk/portal/page?_pageid=268,14201921&_dad=portallive&_schema=PORTALLIVE

The influence of load and suction changes on the volumetric behaviour of compacted London Clay
لینک دانلود: http://www3.imperial.ac.uk/portal/pls/portallive/docs/1/7293263.PDF
چکیده: http://www3.imperial.ac.uk/portal/page?_pageid=268,14201874&_dad=portallive&_schema=PORTALLIVE

Laboratory study on anisotropy of natural London Clay
لینک دانلود به حجم 20 مگابایت: http://www3.imperial.ac.uk/portal/pls/portallive/docs/1/7293260.PDF
چکیده: http://www3.imperial.ac.uk/portal/page?_pageid=268,14201840&_dad=portallive&_schema=PORTALLIVE

Engineering Behaviour of Thanet Sand
لینک دانلود به حجم 27 مگابایت:
http://www3.imperial.ac.uk/portal/pls/portallive/docs/1/7293257.PDF
چکیده:
http://www3.imperial.ac.uk/portal/page?_pageid=268,14201808&_dad=portallive&_schema=PORTALLIVE

Advanced Laboratory Characterisation of London Clay
لینک دانلود:
http://www3.imperial.ac.uk/portal/pls/portallive/docs/1/7293252.PDF
چکیده:
http://www3.imperial.ac.uk/portal/page?_pageid=268,14201798&_dad=portallive&_schema=PORTALLIVE

Collapse behaviour of a compacted silty clay
لینک دانلود به حجم 14مگابایت:
http://www3.imperial.ac.uk/portal/pls/portallive/docs/1/7292708.PDF
چکیده:
http://www3.imperial.ac.uk/portal/page?_pageid=268,14198136&_dad=portallive&_schema=PORTALLIVE

Development, implementation and application of kinematic hardening models for overconsolidated clays
لینک پایان نامه:
http://www3.imperial.ac.uk/geotechnics/publications/phdtheses/agrammatikopoulou
چکیده:
http://www3.imperial.ac.uk/geotechnics/publications/phdtheses/agrammatikopoulou/overview

K. Georgiadis (2003) - "Development, implementation and application of partially saturated soil models in finite element analysis". PhD Thesis. University of London.

Download this thesis : http://www3.imperial.ac.uk/portal/pls/portallive/docs/1/1087909.PDF

The mechanical behaviour of partially saturated soils can be very different to that of fully saturated soils. It has long been established that for such soils, changes in suction do not have the same effect as changes in the applied stresses, and consequently the effective stress principle is not applicable. Conventional constitutive models, which are based on this principle, are therefore of limited use when analysing geotechnical problems that involve the presence of partially saturated soil zones. Although the existing constitutive models for partially saturated soils can reproduce important features of the behaviour of such soils, such as collapse upon wetting, they are less advanced than the conventional fully saturated soil models, and therefore there is much room for improvement. In addition, only a limited number of applications of such models to boundary value problems has been performed in the past. The performance of partially saturated soil models and more importantly the influence of partial soil saturation on the behaviour of geotechnical structures has therefore not been well established.

This thesis presents two new generalised constitutive models for partially and fully saturated soils and their implementation into the Imperial College Finite Element Program (ICFEP). The implementation and performance of the models is validated through a series of single element analyses and the results are compared to analytical solutions and experimental data. Also presented in this thesis is a series of finite element analyses of shallow and deep foundations. These analyses highlight facets of partially saturated behaviour important for engineering problems and more specifically show the effect of partial soil saturation and of fluctuations of the ground water table on the behaviour of footings and piles.

The influence of bored piles on existing tunnels
Schroeder (2002) phd thesis overview
F. Schroeder (2002) - "The influence of bored piles on existing tunnels". PhD Thesis. University of London.

Download this thesis: http://www3.imperial.ac.uk/portal/pls/portallive/docs/1/7292728.PDF

In the urban environment, deep foundations are often constructed in locations very close to existing tunnels. Many tunnels can often only tolerate minimal movements. Tunnel owners are concerned that the process of bored pile construction and/or the subsequent loading of the piles may cause intolerable movements or stress levels that might cause cracking of the tunnel linings. Over the last thirty years tunnel owners have developed restrictive guidelines based on their experience of the problem. This thesis investigates the influence of bored piles on existing tunnels using the finite element method and field measurements.

In this thesis the finite element method was used to analyse the effects of bored pile construction and pile loading on existing tunnels in two separate analyses. The numerical results were supplemented with field measurement of the pile-tunnel interaction problem at a site in central London. It is shown that in order to adequately model the influence of bored pile construction on a nearby tunnel three dimensional analyses are required. Based on three dimensional analyses of the loading of rows of piles a plane strain approach is developed for the analyses of the influence of pile loading on existing tunnels.

A general shell element for use in three dimensional finite element analyses has been developed from basic principals. The development, implementation and testing of this new element type in the Imperial College Finite Element Program (ICFEP) element library is presented and the element is then used to analyse the effects of a dry excavation of a pile bore in the close vicinity of an existing tunnel.

The research presented in this thesis has led to a significantly improved understanding of the pile-tunnel interaction problem. It has been shown that there are many influential factors in the assessment of the influence of pile loading on nearby tunnels and that due to the number of influential factors it is not possible to produce simple design charts that are universally applicable. Therefore, it is concluded that universal guidelines based on just a single parameter, such as the specification of the minimum pile offset developed by the tunnel owners, are necessarily conservative with regards to pile loading and that job specific assessments of the influence of pile loading on adjacent tunnels may lead to economies in the design of building foundations.