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The object of the project is designing a retaining wall propping
for a foundation excavation with simple wood elements. The water level is
located at ~1.5m below the surface so in order to execute a dry excavation a
proper drainage will need to be designed and executed.
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Input data
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SI(EU)
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Description
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Lexcavation=
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7
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m
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-length of the excavation
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lexcavation=
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4
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m
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-width of the excavation
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Hexcavation=
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4.5
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m
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-height of the excavation
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yearth=
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18
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kN/m3
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-unit weight of the soil
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Ø=
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20
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deg
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-internal angle of
friction of soil
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c=
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0
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kPa
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-cohesion of the soil
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qs=
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26
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kN/m2
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-overcharge
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Geotechnical calculation
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Ka=tg2(45-Ø/2)=
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0.49
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-active earth pressure
coeficient
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soil case type
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a
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a-soil with no
cohesion;b-soil with low cohesion;c-soil with high cohesion
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p'a=f(a,b,c)
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83
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kN/m
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-simplified calculation
of total earth pressure
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Dimensioning and verification of the vertical shores(bvsxdvsxHexcavation)
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bvs=
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20
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cm
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-width of a vertical
shore
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dvs=
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15
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cm
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-thicknes of a vertical
shore
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q=p'bvs=
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16.64
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kN/m
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-uniform loading on a
vertical shore
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hy=
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1.5
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m
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-the distance between 2
horizontal shores
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Mmax= ql2/8=
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5
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kNm
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-the maximum moment
loading the vertical shores
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W=bvsdvs2/6=
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750
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cm3
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-the inertia moment
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σadm=Mmax/W=
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62
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daN/cm2
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OK <120 =max allowable structural strength for pine wood
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Dimensioning and verification of the packing laths(bhsxdhsxHexcavation)
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bpl=
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20
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cm
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-width of a packing lath
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dpl=
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15
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cm
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-thicknes of a packing
lath
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q=p'bpl=
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12.48
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kN/m
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-uniform loading on a
packing lath
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ly=
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2
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m
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-the distance between 2
packing lath
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Mmax= ql2/8=
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6
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kNm
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-the maximum moment
loading the packing lath
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W=bpldpl2/6=
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750
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cm3
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-the inertia moment
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σadm=Mmax/W=
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83
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daN/cm2
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OK <120 =max allowable structural strength for pine wood
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Dimensioning and verification of the horizontal shore(bhsxdhsxHexcavation)
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dhs=
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30
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cm
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-diameter of a horizontal
shore
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A=πd2/4=
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706.86
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cm2
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-area of a horizontal
shore
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N=p'hyly=
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249.53
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kN/m
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-uniform loading on a
vertical shore
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lf=Lexc-dvs-dpl=
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6.7
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m
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-length of the horizontal
shore
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i=0.25dhs=
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0.08
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m
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λ=lf/i=
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89.33
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Φ=3100/λ2=
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0.39
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σ'=N/(A1Φ1)=
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90.88
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daN/cm2
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OK <120 =max allowable structural strength for pine wood
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