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{
"metadata": {
"name": "",
"signature": "sha256:b2df79b1bfe1bd5bb53b7bb0f72d193619dc333d1434a7c1a2462664a1d1323a"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter9-In situ stresses"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex1-pg230"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"#calculate total pressure and pore water pressure and effective stress at point\n",
"##initialisation of variables\n",
"Ds= 16.5 ##kN/m**3\n",
"S= 19.25 ##kN/m**3\n",
"g= 9.8 ##kN/m**3\n",
"h1= 6. ##m\n",
"h2= 13. ##m\n",
"##at point A\n",
"Sa= 0.\n",
"Ua= 0.\n",
"Sa1= 0.\n",
"##at point B\n",
"Sb= h1*Ds\n",
"Ub= 0.\n",
"Sb1= Sb-Ub\n",
"##at point C\n",
"Sc= h1*Ds+h2*S\n",
"Uc= h2*g\n",
"Sc1= Sc-Uc\n",
"##results\n",
"print'%s %.2f %s'% ('total pressure at C= ',Sc,' kN/m**3 ')\n",
"print'%s %.2f %s'% ('pore water pressure at C = ',Uc,' kN/m**3 ')\n",
"print'%s %.2f %s'% ('effective stress at point C=',Sc1,' kN/m**3 ')\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"total pressure at C= 349.25 kN/m**3 \n",
"pore water pressure at C = 127.40 kN/m**3 \n",
"effective stress at point C= 221.85 kN/m**3 \n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex2-pg233"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate maximu depth that can be made in clay\n",
"##initialisation of variables\n",
"h= 20. ##ft\n",
"g= 120. ##kg/ft**3\n",
"h1= 12. ##ft\n",
"w= 62.4 ##kg/ft**3\n",
"##calculations\n",
"H= h-(h1*w/g)\n",
"##results\n",
"print'%s %.2f %s'% ('maximu depth that can be made in clay = ',H,' ft ')\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"maximu depth that can be made in clay = 13.76 ft \n"
]
}
],
"prompt_number": 8
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex3-pg236"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate effective stress at point a and b and see page force per unit voume\n",
"##initialisation of variables\n",
"G= 2.68\n",
"e= 0.52\n",
"g= 9.81 ##kN/m^3\n",
"h1= 0.7 ##m\n",
"h2= 1 ##m\n",
"h3= 1.5 ##m\n",
"h4= 2 ##m\n",
"##calculations\n",
"##for soil A\n",
"sa= (G+e)*g/(1.+e)\n",
"##point a\n",
"Sa= h1*g+h2*sa\n",
"u= (h2+h1+h3/2.)*g\n",
"Es= Sa-u\n",
"##point b\n",
"sb= h1*g+h4*sa\n",
"ub= (h4+h1+h3)*g\n",
"Eb= sb-ub\n",
"i= h3/2.\n",
"s= i*g\n",
"##results\n",
"print'%s %.2f %s'% ('effective stress at point a=',Es,' kN/m^2 ')\n",
"print'%s %.2f %s'% ('effective stress at point b= ',Eb,'kN/m^2 ')\n",
"print'%s %.2f %s'% ('seepage force per unit voume = ',s,' kN/m^3 ')\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"effective stress at point a= 3.49 kN/m^2 \n",
"effective stress at point b= 6.97 kN/m^2 \n",
"seepage force per unit voume = 7.36 kN/m^3 \n"
]
}
],
"prompt_number": 9
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex4-pg239"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate safety factor\n",
"##initialisation of variables\n",
"C0= 0.357\n",
"H1= 30.5 ##ft\n",
"H2= 5. ##ft\n",
"w= 62.4 ## lb/ft^3\n",
"D= 20.\n",
"g= 112. ## lb/ft^3\n",
"##calculations\n",
"G= g-w\n",
"FS= D*G/(C0*w*(H1-H2))\n",
"##results\n",
"print'%s %.1f %s'% ('safety factor =',FS,' ')\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"safety factor = 1.7 \n"
]
}
],
"prompt_number": 5
}
],
"metadata": {}
}
]
}
|
