Deep excavations and deep foundation systems combined with energy piles

Baltic Piling ◽  
2013 ◽  
pp. 13-26 ◽  
Author(s):  
R Katzenbach ◽  
S Leppla ◽  
T Waberseck
Keyword(s):  
Deep Foundation ◽  
Deep Excavations ◽  
Energy Piles

Risk Assessment in Deep Excavations and their Effect on Surrounding Structures : A review

2021 ◽  
Author(s):  
Syed Uzairuddin
Keyword(s):  
Risk Assessment ◽  
Large Scale ◽  
Prediction Models ◽  
Three Dimensional ◽  
Ground Movement ◽  
Deep Foundation ◽  
Deep Excavations ◽  
Ground Deformations ◽  
Theoretical Approaches ◽  
Deep Foundation Excavation

—Construction is crucial to a country's overall economic growth, particularly in developing countries, in the current era of globalization. If construction operations are not carried out strictly according to a local or national building code, they might result in large-scale failures endangering human lives, personnel property, and the economic balance. It is vital to handle the construction process's risk elements. The self weight of soil behind the retaining line is the driving force and shear strength of soil is the resisting force as a result, deep excavations invariably cause lateral and vertical ground deformations. As a result of the produced ground deformations, nearby buildings and utilities become kinetically loaded. Risks associated with ground movement cannot be calculated solely using mathematical predicting models and engineering simulations as it needs to address the uncertainty of soil properties, Geo-materials, ground constitutive nature, building stage modelling, three-dimensional impacts of deep excavations, time-dependent natures of ground deformations, and the critical necessity to include human variables such as craftsmanship into prediction models are all important considerations.This article provides an overview of risk assessment and management technologies and approaches that have been adapted for use in deep excavations. This article presents a review of the most effective methods for evaluating hazards related with deep excavation and current mitigating techniques. Theoretical approaches to enhancing the safety of deep foundation excavation are examined in the context of a hospital building in Khartoum state and a residential district project in southern Jianxi province.

scholarly journals Optimization of parameters of the bearing structures of deep excavations with minimization of environmental impacts

2019 ◽  
Vol 110 ◽  
pp. 01002
Author(s):  
Pavel Morozovskiy ◽  
Anna Babanina ◽  
Kristina Ziiaeva ◽  
Sergey Shulzhenko
Keyword(s):  
Environmental Impacts ◽  
Technical Efficiency ◽  
Optimization Algorithm ◽  
Small Strain ◽  
Economic Feasibility ◽  
Deep Foundation ◽  
Program Complex ◽  
Deep Excavations ◽  
Optimization Of Parameters ◽  
Coulomb Model

The aim of the project is optimizing the parameters of deep foundation pits in order to improve their technical efficiency and economic feasibility, and development of an optimization algorithm. The analysis is carried out using the program complex PLAXIS 2D 2011. The article considers a model of the foundation pits to a depth of 5-20 m with various settings of attachment. To study the work of the soil body, the Mohr- Coulomb model is used as the simplest and strengthening soil with a small strain as the most reliable.

scholarly journals Strength Tests of Hardened Cement Slurries for Energy Piles, with the Addition of Graphite and Graphene, in Terms of Increasing the Heat Transfer Efficiency

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1190
Author(s):  
Tomasz Sliwa ◽  
Aneta Sapińska-Śliwa ◽  
Tomasz Wysogląd ◽  
Tomasz Kowalski ◽  
Izabela Konopka
Keyword(s):  
Hardened Cement ◽  
Environmental Aspects ◽  
Cement Slurry ◽  
Subsequent Increase ◽  
Load Bearing ◽  
Heat Transfer Efficiency ◽  
Strength Tests ◽  
Energy Piles ◽  
New Buildings ◽  
New Facility

The development of civilization, and subsequent increase in the number of new buildings, poses engineering problems which are progressively more difficult to solve, especially in the field of geotechnics and geoengineering. When designing new facilities, particular attention should be paid to environmental aspects, and thus any new facility should be a passive building, fully self-sufficient in energy. The use of load-bearing energy piles could be a solution. This article presents research on the cement slurry formulas with the addition of graphite and graphene, that can be used as a material for load-bearing piles. The proposed solution is to introduce U-tubes into the pile to exchange heat with the rock mass (the so-called energy piles). A comparison of four slurry formulas is presented: the first one consisting mainly of cement (CEM I), graphite, and water, and the remaining three with different percentages of graphene relative to the weight of dry cement. The results could contribute to the industrial application of those formulas in the future.

scholarly journals A Review on Energy Piles Design, Evaluation, and Optimization

2021 ◽  
pp. 125802
Author(s):  
Zahraa Mohamad ◽  
Farouk Fardoun ◽  
Fekri Meftah
Keyword(s):  
Design Evaluation ◽  
Energy Piles

scholarly journals Comparative Study of the Field Performances of Pressure-Grouted Micropiles Using Gravity and Packers

2021 ◽  
Vol 11 (15) ◽  
pp. 6736
Author(s):  
Ong Heo ◽  
Yeowon Yoon ◽  
Jinung Do
Keyword(s):  
Urban Areas ◽  
High Performance ◽  
Driving Forces ◽  
Field Performance ◽  
Underground Space ◽  
Creep Tests ◽  
Deep Foundation ◽  
Installation Depth ◽  
Pressure Grouting ◽  
The One

When underground space requires excavation in areas below the water table, the foundation system suffers from buoyancy, which leads to the uplifting of the superstructure. A deep foundation system can be used; however, in cases where a hard layer is encountered, high driving forces and corresponding noises cause civil complaints in urban areas. Micropiles can be an effective alternative option, due to their high performance despite a short installation depth. Pressurized grouting is used with a packer to induce higher interfacial properties between micropile and soil. In this study, the field performance of micropiles installed using gravitational grouting or pressure-grouted using either a geotextile packer or rubber packer was comparatively evaluated by tension and creep tests. Micropiles were installed using pressure grouting in weak and fractured zones. As results, the pressure-grouted micropiles showed more stable and stronger behaviors than ones installed using the gravitational grouting. Moreover, the pressure-grouted micropile installed using the rubber packer showed better performance than the one using the geotextile packer.

scholarly journals Analysis of Seepage Characteristics of a Foundation Pit with Horizontal Waterproof Curtain in Highly Permeable Strata

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1303
Author(s):  
Chenghua Shi ◽  
Xiaohe Sun ◽  
Shengli Liu ◽  
Chengyong Cao ◽  
Linghui Liu ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Theoretical Calculation ◽  
Calculation Method ◽  
Design Method ◽  
Water Pressure ◽  
Water Inflow ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Seepage Characteristics

At present, jet-grouted horizontal waterproof curtain reinforcement has become an essential method for deep foundation pit groundwater control. However, there is still a lack of an effective theoretical calculation method for horizontal waterproof curtain reinforcement, and there is little research on the seepage laws of foundation pits under different horizontal waterproof curtain conditions. Based on Darcy’s seepage theory, theoretical analysis models of deep foundation pit seepage were established considering the effect of a horizontal curtain in a highly permeable formation. Through the established models, the calculation method of the water inflow and the water pressure under the condition of a horizontal curtain was derived. Then through indoor tests, the reliability of the theoretical calculation method was verified. Furthermore, the established theoretical calculation method is used to analyze the influence of various factors on the water inflow and the water pressure, such as the ratio of hydraulic conductivity of the horizontal curtain to surrounding soil, thickness, and reinforcement position of the horizontal curtain. It is found that the hydraulic conductivity ratio has the most significant influence on the seepage characteristics of the foundation pit. Finally, the design method was applied to an example of the horizontal waterproof curtain of the foundation pit, which is located at Juyuanzhou Station in Fuzhou (China). The water inflow per unit area is 0.36 m3/d in the foundation pit, and this implies that the design method of the horizontal waterproof curtain applied for the excavation case is good and meets the requirements of design and safety.

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