Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 24 for “"Ground Response"”.
-
Long-term ground response For borehole heat exchangers in clay
The use of ground source heat pumps to transfer heat to and from the ground via borehole heat exchangers is among the most energy efficient techniques for space heating and cooling. Designs for seasonal heat exchange systems are becoming increasingly popular in urban environments to reduce energy …
-
Numerical Modeling of Room-and-Pillar Coal Mine Ground Response
Underground coal mine ground control persists as a unique challenge in rock mass engineering. Fall of roof and rib continue to present a hazard to underground personnel. Stability of underground openings is a prerequisite for successful underground coal mine workings. An adaptation of a civil …
-
Earth pressure balance (EPB) shield tunneling in Bangkok : ground response and prediction of surface settlements using artificial neural networks
… exists about the actual mechanisms of shield-ground interaction. The ground response mechanism induced by EPB tunneling is difficult to understand, because this requires not only reliable ground deformation measurements in the field but also operational records of the shield. Numerous …
-
Contributions to the analysis and mitigation of liquefaction in loose sand slopes
… Manzari (2004; DM2004) for simulating the cyclic response of sand. The model formulation is based on theories of bounding surface plasticity and critical state soil mechanics. The thesis presents a series of algorithms needed to achieve robust integration of the DM2004 model in OpenSees, documents …
-
Stochastic and seismic design response of linear and nonlinear structures
… calculating the stochastic and seismic design response of linear and nonlinear structures are presented. For linear structures, two approaches are developed: (1) the modified mode displacement approach for classically as well as non-classically damped structures, and (2) the generalized force …
-
The Impact of Rolling Dynamic Compaction
… as it is towed, causing it to fall to the ground and compact it dynamically. There is currently little guidance available for geotechnical practitioners regarding the depths of improvement that are possible in varying soil conditions. Current practice dictates that practitioners rely on …
-
Prediction and interpretation of ground movements due to tunneling in stiff clay and impacts on adjacent structures
… around the precast lining in order to limit ground movements and potential damage to overlying structures. This thesis analyzes monitoring data from the Crossrail project involving twin tunnels construction using Earth Pressure Balance (EPB) machines in London Clay. The research focuses on …
-
Seismic Behavior of Pile -Supported Bridges
… is performed using input motions obtained from ground response analysis of bedrock motions artificially generated for the Cairo area. Comparison studies of dynamic characteristics and seismic response of the bridge obtained from the integrated model and those obtained from other foundation …
-
Seismic site response analysis and extraction of dynamic soil behavior and pore pressure response from downhole array measurements
Seismic site response analysis is commonly used to predict ground response due to local soil effects. Advancements in the knowledge of shear-induced excess pore pressure generation has led to the development and implementation of pore pressure response models for site response analysis with …
-
Exact modal synthesis methods for seismic analysis of primary and multiply supported secondary systems
… approach for the calculation of the system response for any forcing function . For seismic analysis of combined primary and secondary structures, such as a main structure supporting piping or other auxiliary system, the combined structure is divided into two substructures. The …
-
Ground source heat storage and thermo-physical response of soft clay
Ground source heat storage can condition buildings with reduced consumption of fossil fuels, an important issue in modem building design. However, seasonal heat storage can cause soil temperature fluctuations and possibly deformation of soft clays. This thesis evaluates the thermo-mechanical …
-
Applications of Surface and Subsurface Subsidence Theories to Solve Ground Control Problems
The stability of the underground mine openings largely depends on the surrounding ground conditions, such as stress concentrations, geological conditions and support intensities etc. In particular, the ground control stability associated with large movements and deformations of the strata is much …
-
Investigating the Dynamic Soil Behaviour of Cape Flat Sands Under Earthquake Cyclic Loading
… limited assumptions about soil type, earthquake response, relative density, plasticity, confining pressure, and saturation level. The cyclic properties of the Cape Flat Sands were evaluated at ten different cyclic axial strains (0.005%, 0.01%, 0.02%, 0.05%, 0.1%, 0.2%, 0.4%, 0.6%, 0.8% and 1.0%), …
-
Numerical simulation of ground movements and structural forces in lining for Earth Pressure Balance (EPB) tunneling in clay
… a prescribed trajectory. The model simulates ground conditions associated with on-going EPB tunnel construction for the Crossrail project in central London. The analyses use a linearly-elastic perfectly plastic (MC) soil model based on design profiles of undrained shear strength and stiffness …
-
Seismic response analysis of multiply connected secondary systems
… to correlated inputs at several points. The response of the secondary systems is expressed as a combination of the dynamic, pseudo-static and cross response components. The dynamic part is associated with the inertial effect induced by the support accelerations. The pseudo-static part is due …
-
Shear Modulus Degradation of Liquefying Sand: Quantification and Modeling
… to predict how a soil will react to large ground motions produced by earthquakes. Of all the different types of soil, liquefiable soils present some of the greatest challenges. The ability to quantify the degradation of a soil's shear modulus as it undergoes liquefaction would help …
-
Enhanced Anisotropic Bounding Surface Model: Implementation and Simulation of Excavation in Soft Cohesive Soils
… analysis for simulating deep excavation induced ground deformations. The first phase of this research illustrates efforts in integrating the enhanced anisotropic bounding surface model into finite element analysis (FEA) software. The implementations are validated against undrained isotropic and …
-
Analysis of NATM and shield tunneling in soft ground
Demand for new underground transportation systems and utility networks has increased the use of tunneling in soft ground. Many of these tunnels have to be constructed in difficult soil conditions, with strict constraints on ground movement control. Technological advances, such as the pressurized …
-
Supervised learning for back analysis of excavations in the observational method
… few decades, demand for construction in underground spaces has increased dramatically in urban areas with high population densities. However, the impact of the construction of underground structures on surrounding infrastructure raises concerns since movements caused by deep excavations might …
-
Uncertainty-Based Design Optimization and Decision Options for Responsive Maneuvering of Reconfigurable Satellite Constellations
… information to co-ordinate the ground response. Reconfigurable satellite constellations can provide on-demand regional coverage by maneuvering orbits to focus passes over the area of interest. In contrast, traditional satellite constellations cannot maneuver to pass over specific …
Page 1 of 2