underground houses

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WELCOME

Underground houses on sliding lopes

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UNDERGROUND HOUSES ON SLIDING

SLOPES

GUIDED BY : PRESENTED BY: Mr. NAVEEN . A . P ALFI .C .ALI ASST . PROFESSER S7 CE CIVIL DEPT ROLL NO: 07

Underground houses on sliding slopes

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INTRODUCTION Low rise residential building adapt on any type of terrain

Generally building houses on flat terrains

Not applicable to areas with different topography

Hilly areas often face slope stability problems

Problems of hilly areas are Present surface with displacement

Movement or collapse risk displacement

Land slide


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The construction on slopes raises problems

regarding structural and architectural approach

Mainly slope constructions are by securing a

backfill or excavation with retaining walls

The cost of this extra work increases the total

construction cost


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LAND SLIDES

Part of natural disasters, often they are produced involuntary by men The reason for landslide

Lose of stability due to increases load Decrement of resistance of earth to shear action Rise in underground water level Water pressure in pores Excavation Artificial vibration Earthquakes Sudden melting of snow Freeze and thaw phenomenon


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Criteria used for the classification of landslides

Nature of the rock

Depth of sliding surface

Type of movement

Position of the sliding surface to the earths stratification

By the sliding speed


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ARCHITECURAL

APPROACHES

REGARDING BUILDING

ON SLOPES


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Factors in the design process in underground or semi buried houses

1. morphology of terrain

2. orientation towards the cardinal points

3.prevailing winds

4. wonderful views

5. existence of vegetation

6. size of the plot

7.urban or rural location

8.stratification the terrain

9.level of ground water

Main factors consider is topography, the soil, level of groundwater and neighbourhoods


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Denying the slopes Solving the elevation by the construction on silts ,together

with cantilever

Minimal impact on natural terrain

Also applied to terrain with very steep slopes

Higher cost

Require complex foundation system


Fig :Architectural approach on slopes-denying the slopes

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Earthwork Creating embankments and cutting

Increasing the horizontal terrain

Dealing with different denial of slopes

Houses are closer to ground

By levelling the terrain

Excavation rises the cost and affect stability of slopes


Fig : Architectural approach on slopes - earthworks

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Cascade houses and Embedded houses

1. Depending on the slopes of terrain and shape of slope

2. Levels are interlinked

3. Setting at different height

4.Excavation ,embankment and cutting volume are quite small

5. But required numerous stairs

6. More attention must be paid to the foundation system


Fig : Architectural approach on slope –cascade house [L] , embedded house[R]

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Half -buried and Underground houses

Reduce the energy consumption that balance the interior

temperature

In recessed, encapsulated houses the glazing is reduced to only

one elevation or even less

Since the volume of house is deeper into ground, the stability of

sliding slope increases.

It provide natural lighting and ventilation and create a

comfortable living space


Fig : Architectural approach on slope-half-buried and underground

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Different approaches for the plan of half buried and underground houses on slopes


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Sliding house

Under ground house on slopes

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SLOPE STABILITY CASE STUDY To perform stability analysis

Slope having 50m length 22 degree inclination Succession of soil layer

The ground water table is found in the layer of sand on the inferior part, at -2.95m deep from ground level


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Most probably sliding surface occurs in the sandy layer

of soil

Method

Sarma method –slopes with polygonal sliding

surface

Fellenius petterson method- slopes with circular

sliding surface

Factor of safety for stability, Fs = 1.50

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UNDERGROUND CONSTRUCTION

Homes that built underground, either partially or completely

Europe , America, and Russia thousands of people live in

underground houses

Misinformed belief that underground houses are dirty, damp,

dark, claustrophobic and unstable

Due to lack of guidance and information about the building

regulation ,specification, lack of knowledge about their

potential as sustainable building


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Under ground house

Underground hill house

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UNDERGROUND DWELLING DESIGN

Design mainly consider the condition of soil

soil type, topography, groundwater level, load bearing

property and slope stability –also considered

construction material – water proof ,durable, strong to

withstand underground pressure

Underground water is mainly considered , special drainage

techniques is need in sites and in roof areas


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METHOD OF BUILDING Constructed cave

Cut and cover or culvert homes

Earth berm

Elevational houses

Atrium

PSP –post –shoring - polyethylene

Shaft


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EARTH BERM HOME

CAVE HOME

CULVERT HOME

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ADVANTAGES Energy efficiency Less building material and labour Less property tax Warm in winter and cool in summer Cut down on atmospheric radiation Sound and more fire proof Less maintenances Better shelter from storms


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DISADVANTAGES

Houses are unconventional and require

careful planning

Cannot built in a flood prone area

Significant care to keep out moisture

Require complex ventilation procedures


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CASE STUDYEARTH SHELTERED HOUSE--COSTWALD ENGLAND ROTHELL HOMES

http://theundergroundhomedirectory.com/files/2014/08/rothell-terradome-home.jpg

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HOUSE GAZEBO

MARSHALL HOUSE

http://theundergroundhomedirectory.com/files/2014/04/ecuador-underground_house-house_gazebo.jpg

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CONCLUSION Underground houses on sliding slopes are always

challenging

Slope stability analysis should done and the slope

should be stable enough

Cost is roughly 15% -25% more than regular homes

Energy saving may be upward of 85% -90%

Thus all other extra expenses overcomes in short period

To an extend underground homes are comfortable for

good living



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REFERENCE The Underground Space Centre, University of

Minnesota. Earth Sheltered Housing Design

Wells.M the Underground design, brick houses

Wells .M the Earth sheltered house

Molnar I ,Ilies NM Popa A consolidation of an

active surface landslide

Popa A Ilies N Chiorean.C.Utilization of analytical

methods in slope stability and consolidation



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THANK YOU

underground houses

Engineering