Herbert Klapperich

Analytical Prediction of Ground Movements due to a Nonuniform Deforming Tunnel

AbstractAn analytical solution is presented to predict ground movement induced by a nonuniformly deforming circular tunnel in a heavy elastic half-plane. Simple expression is proposed to describe the nonuniform soil deformation around the tunnel. The tunnel-deforming components (i.e., ground loss, ovalization, vertical translation) can be determined by the solution-inherent mechanism and by fitting from measured field data. The effects of tunnel-deforming components on the resulting displacement field are discussed. Case studies from various ground conditions were used to check the capacity and applicability of the proposed solution. Although elasticity is a rough representation of the soil behavior, the proposed analytical solution can serve as a simple tool for predicting a reasonable ground settlement profile in the preliminary design of tunnels.

Monitoring and Early Warning System in Earth Management - Based on Self-organized Fusion Sensor Networks

In this paper, an advanced self-organized monitoring sensor network in earth management is presented and an appropriate evaluation concept for the safety state of slopes based on data fusion and data mining methods to minimize false alarms and improve the criteria under which an early warning can be issued.

The influence of trenching diaphragm wall panels on deflection and bending moment of existing piles within piled foundation

Conducting deep excavations for underground construction inside the cities requires diaphragm wall due to space limitation. The ground surface is affected by the trenching process. The construction of the diaphragm walls near deep foundations may not be avoided specially in the crowded cities. This research focuses on the deflection and bending moment of piled foundations near slurry trench. Since the trench is considered as a three-dimensional problem, a three-dimensional numerical analysis was used in this research. It was conducted using a commercial analysis software known as FLAC 3D. The numerical analysis method was verified using two case histories, one in Hong Kong and another one in Giza, Egypt. The results from the numerical analysis were in quite a good contrast with the field data results. This indicates that the trenching process could be numerically modeled with the proposed method and provides good results. The verified numerical analysis method was used to conduct a numerical parametric sric study that discusses the effect of multiple panels on adjacent connected pile groups or piled raft foundation. The parametric study showed that the pile deflection and bending moment are affected by the panel construction stages, pile location within the foundation. The pile deflection and bending moment are affected by the stages of construction. The piles near the trench are affected by the trenching process, while the piles far from the trench are affected by the dragging force of the pile near the trench.

The Deflection and Bending Moment of Existing Piles Influenced by Trenching Diaphragm Wall Panel(s)

Diaphragm walls are normally used for the deep excavations and underground construction inside the cities. The trenching process of diaphragm walls causes deformation in the ground surface. The construction of the diaphragm walls near deep foundations may not be avoided specially in the crowded cities. This research focuses on the deflection and bending moment of piled foundations near slurry trench. Since the trench is considered as a three dimensional problem, a three-dimensional numerical analysis was used in this research. It was conducted using a commercial analysis software known as FLAC 3D which is based on the finite different analysis method. Verification was made for the numerical analysis method using two case histories, one in Hong-Kong and another one in Giza, Egypt. The results from the numerical analysis were in quite a good contrast with the field data results. This means the trenching process could be numerically modeled with the proposed method and provides good results. The verified numerical analysis method was used to conduct a numerical parametric study that discusses the effect of a single or double panel(s) on the nearby piled foundation. The parametric study showed that the pile deflection and bending moment are affected by the panel length, pile diameter, pile location from the trench, groundwater level and the existence of a weak soil layer that could cause reduction in slurry pressure. The panel thickness did not show any influence on the pile bending moment or deflection. The decrease of the panel length and controlling the slurry level will reduce the influence of trenching on nearby piles. Lowering the groundwater level before trenching could probably reduce the influence on the pile as well.

Nachnutzung und Flächenvermarktung

Im Ergebnis der in den vorherigen Kapiteln beschriebenen Sanierung und Wiedernutzbarmachung ehemaliger Tagebaugebiete entstehen neue Landschaften mit veranderter Nutzungsstruktur und vielfaltigen Potenzialen fur eine Folgenutzung . Nach grundsatzlichen Uberlegungen zur Wiedereingliederung der Bergbauflachen in den Nutzungskreislauf werden diese Potenziale am Beispiel der Liegenschaften des stillgelegten Braunkohlenbergbaus naher untersucht und mogliche Strategien zur Identifikation und Umsetzung dieser Potenziale dargestellt. Im Mittelpunkt stehen dabei die Erarbeitung integrierter Nutzungskonzepte, eine darauf aufbauende nachnutzungsorientierte Sanierung und die zugige Vermarktung der sanierten Flachen. Einen besonderen Schwerpunkt bildet die Revitalisierung von Industriealtstandorten.

Interdisziplinäres Flächenrecycling - Brachennutzung contra Grünland-Verbrauch -

Die Diskussion um die Wiedernutzung von „Brachen“ wird meist von einem Schlagwort gepragt: Flachenrecycling. Hierunter versteht man die Neugestaltung von Flachen, die ihren bisherigen Nutzungszweck aus wirtschaftlichen, okonomischen oder sozialen Grunden verloren haben. Konkret werden hierunter vor allem Masnahmen versanden, die planerisch, umwelttechnisch und wirtschaftspolitisch einer sinnvollen Wiedereingliederung einer Flache in den Nutzungskreislauf dienen.