Increases in stresses and settlement to an existing building due to a new one

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SUMMARY

The discussion focuses on the geotechnical engineering challenge of assessing the impact of a new office building on an existing high-rise complex in a densely populated area. Key parameters include the soil properties, with a modulus of elasticity (E) of 45 MPa and a Poisson's ratio (ν) of 0.3, and the load-bearing capacities of both buildings, 2400 MN for the existing complex and 1000 MN for the new office. The primary concern is the potential settlement and stress increase on the existing building due to the new construction, necessitating calculations of settlement influence factors and vertical elastic settlement. The pressure bulb graph is mentioned as a potential tool for analysis, though its application remains unclear to the participants.

PREREQUISITES
  • Understanding of geotechnical engineering principles
  • Familiarity with soil mechanics, specifically settlement calculations
  • Knowledge of stress distribution theories in soil
  • Ability to interpret pressure bulb diagrams
NEXT STEPS
  • Research methods for calculating settlement influence factors in adjacent structures
  • Study vertical elastic settlement calculations for different soil types
  • Learn how to interpret and apply pressure bulb graphs in geotechnical analysis
  • Explore case studies on the effects of new constructions on existing buildings
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Geotechnical engineers, civil engineers, and students in engineering disciplines focused on soil mechanics and structural integrity, particularly those involved in urban construction projects.

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1. I have been given a homework problem for my geotechnical engineering course and to be honest I don't even know where to start, I was hoping someone could give me a few hints as to where I should start.

The question is:

You are the geotechnical engineer for a proposed office building in a densely clustered city. The office building will be constructed adjacent to the existing office complex. The soil of the site is a deposit of very dense sand with E=E′=45 MPa and ν=ν′=0.3. The sand rests on a deep deposit of dense gravel. The existing high rise complex is founded on a concrete slab 100m x 120m located 2m below the ground surface, and transmits a load of 2400 MN to the soil. Your office foundation is 50m x 80m and transmits a load of 1000 MN. You also intended to locate your foundation at 2m below ground level. The front of your building is aligned with the existing office complex, and the side distance is 0.5m. The lesser dimension of each building is the frontal dimension. The owners of the existing building are concerned about the possible settlement of their building due to your building. You are invited to a meeting with your client, the owners of the exiting building and their technical staff. You are expected to determine what effects your office building would have on the exiting building. You only have one hour to make the preliminary calculations. You are expected to present the estimated increase in stresses and settlement of the exiting complex will due to construction of your office building. Prepare your analysis and presentation.
 
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I have been working on the question and found that I can find the settlement influence factor for each building and the vertical elastic settlement for each building as well as the increase in stresses for each building, however, I need to find how one building influences the other. I have found a pressure bulb graph in my textbook, however, I don't know how to correctly read it or if it is even relevant to the question. Please help me :)
 
Hi,
I have a similar question i have been posed with. Did you work out how to do it? Would love to hear if you have.

Regards
 

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