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diff --git a/Principles_Of_Geotechnical_Engineering_by_B_M_Das/18-Subsoil_Exploration.ipynb b/Principles_Of_Geotechnical_Engineering_by_B_M_Das/18-Subsoil_Exploration.ipynb
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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 18: Subsoil Exploration"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 18.1: solved.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc\n",
+"//solving for z=5 only\n",
+"To=0.275\n",
+"Cn=To^(-0.5)\n",
+"N60=8\n",
+"N160=Cn*N60\n",
+"printf('(N1)60 = %f',N160)"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 18.2: solved.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc\n",
+"z=5\n",
+"To=0.275\n",
+"Cn=2/(1+To)\n",
+"N60=8\n",
+"N160=Cn*N60\n",
+"printf('(N1)60 = %f',N160)"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 18.3: solved.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc\n",
+"pa=1 // 14.7 lb/in^2 = 1ton/ft^2\n",
+"To=0.275 // ton/ ft^2\n",
+"N60=8\n",
+"c= atand((N60/(12.2+20.3*(To/pa)))^0.34)\n",
+"printf('The average soil friction angle = %f',c)"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}