Practical Aspects of The Design Of Diaphragm Walls

The design of diaphragm walls has always been treated as something of a mystery. Although this is not exactly a happy situation, the misconception is justified to some extent. The design of diaphragm walls does have some aspects, theoretical as well as practical, which must be well appreciated before a designer who is new to the subject can delve into it. The attempt here will be to demystify the subject while indicating the problems as well as the practical solutions that a designer comes across in the noble practice of the diaphragm wall design.

The Deflection of Earth Retaining Diaphragm wall during Deep Excavation

The technique of constructing reinforced concrete diaphragm wall together with internal bracing or tie back system in deep excavation has been practiced for many years. It has become on of the most popular earth retaining schemes for deep excavation nowadays, yet the analytical methods on the lateral displacement and deflection of the diaphragm wall are still in vague and a sort of art.

This report describes a simple spring model method to predict the lateral displacement and deflection of the diaphragm wall in according to sequence of excavation. A scheme of selecting proper soil strength parameters and earth pressure diagram as well as determination on the soil spring constants is introduced.

Direct measurements on the lateral movement of the diaphragm wall has been carried out in site during deep excavation. The results demonstrated that the prediction for lateral movement of the diaphragm wall by the spring model method has a reasonably fail accuracy.

Design of Diaphragm walls for the TRTS Deep Excavations

The diaphragm wall designed of more than 100 sections of the Taipei Rapid Transit Systems are reviewed and analyzed collectively with emphasis on wall depth, strut reaction, wall bending moment and wall deflection. The subsoil conditions, methods of analysis, methods of construction, ground improvement and groundwater pressure assumptions used in the design are discussed.

A COMPREHENSIVE METHOD FOR DESIGN OF ANCHORED WALL FOR DEEP EXCAVATION

A major problem engineers face in the analysis of excavation by the classical methods is the difficulty of predicting displacements around the support structure. To solve this problem, finite element method (FEM) is increasingly employed. However, so many engineers in the field have little knowledge of FEM that hampered the method to spread in practice.

In this paper authors attempt to provide a useful tool for field engineer, who know little of FEM, to design the structure by both classical pressure diagram and FEM methods at same time. At first, calculate depth of pile and anchor force by each of classical methods, including free earth support, fixed earth support, a modified and an improved fixed earth support, and then compute the displacements by FEM method for each situation respectively. For FEM method, an elasto-plastic theory and a Mohr-Coulomb constitutive law are adopted for soils and the mesh is automatically formed. After comparison, a safer and more economical design can be selected. To support this method, a computer package on Windows 95 base has been developed by the authors. Results of a practical example show that the improvement of fixed earth support method is better for the design.

Brazil world cup 2014 and AutoCAD 2013

Journal of Water Resources Development - Requested papers

MATLAB: A Fundamental Tool for Scientific Computing and Engineering Applications Vol 1

Good Practices in Urban Water Management: Decoding Good Practices for a Successful Future

This report presents case studies on successful Asian water utilities. The case studies provide objective, accurate, and critical analyses of urban water management practices in eight Asian cities over a 10-year period.

Other local leaders throughout the developing world can use these cases to help craft their own solutions, taking into account specific local circumstances. What is most important for cities is to find some common base elements for success and then replicate these, albeit with appropriate modifications, to suit their own special conditions.

A mechanistic study explaining the synergistic viscosity increase obtained from polyethylene oxide (PEO) and β-naphthalene sulfonate (BNS) in shotcrete