HYDROCON

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<p>.J</p><p>1</p><p>l</p><p>7</p><p>7</p><p>7</p><p>7</p><p>1</p><p>ri</p><p>d</p><p>J</p><p>J</p><p>l</p><p>o</p><p>lJ</p><p>í]</p><p>o</p><p>o</p><p>u</p><p>:1</p><p>J</p><p>l</p><p>VFi WYfc!'!'!'r"! !�'r!'�ff</p><p>WF24581 To WF24585</p><p>HYDROCON HYDRAULIC</p><p>OEDOMETERS</p><p>Serial No.</p><p>VFi</p><p>Wykeham Farrance Intemational Limited</p><p>WestonRoad</p><p>Telephone 01753 571241</p><p>Telefax 01753 811313</p><p>Trading Estate</p><p>Slough</p><p>Berks, SLl 4HW</p><p>England</p><p>Telex 847301 WFENGG</p><p>Email 10l333,1232@compuserve.com</p><p>josecorreia</p><p>Sublinhado</p><p>x</p><p>-i</p><p>}</p><p>. I</p><p>l</p><p>7</p><p>r 1</p><p>l</p><p>7</p><p>'1</p><p>J</p><p>J</p><p>]</p><p>'J</p><p>J</p><p>- l</p><p>]</p><p>'1</p><p>u</p><p>- J</p><p>J</p><p>l</p><p>l</p><p>4.03</p><p>4.04</p><p>ADDITIONAL EQUIPMENT REQUIRED TO OPERATE THE HYDROCON</p><p>FOR EXAMPL E:</p><p>PRESSURE SYSTEMS</p><p>Two independent pressure systems are required for example:</p><p>Air PressureLWater</p><p>1 x WF13020 Central panel.</p><p>2 x WF13000 Air water interfaces.</p><p>NOTE:</p><p>A source of compressed air is also required.</p><p>Maximum pressure 1700 kpa (250 psi).</p><p>Oil Water System-s</p><p>2 x WF12982 Constant Pressure Systems.</p><p>Maximum pressure 1700 kpa (250 psi).</p><p>Mercury Pot Pressure System</p><p>WF12780 Two outlet pressure systems.</p><p>Maximum pressure 1100 kpa.</p><p>Further details are given in Appendix A.</p><p>PORE WATER PRESSURE MEASUREMENT</p><p>1 x WF17029 Transducer de-airing block.</p><p>1 x WF17060 Pressure Transducers 1000 kpa (150 psi).</p><p>or</p><p>1 x WF17021 Pressure Transducer 1700 kpa (250 psi).</p><p>or</p><p>1 x WF17023 Pressure Transducer 7000 kpa (1000 psi).</p><p>NOTE: A suitable digital readout device or data logger is also</p><p>required.</p><p>-4-</p><p>j</p><p>t</p><p>l</p><p>l</p><p>7</p><p>l</p><p>J</p><p>J'</p><p>1</p><p>'J</p><p>J</p><p>J</p><p>:1</p><p>L1</p><p>J</p><p>]</p><p>1</p><p>j</p><p>l</p><p>8.14</p><p>8.15</p><p>recorded. Increments of 50 or 100 kPa have been</p><p>found to be satisfactory for most soils.</p><p>The pore water pressure change should be plotted</p><p>against time to ensure that equalisation of</p><p>pore-water pressure has been attained.</p><p>The B value is computed using the equation in</p><p>8.06</p><p>If the B value is not at least 0.9 for very stiff</p><p>soils or 0.95 for soft to firm soils steps 8.08</p><p>to 8.13 should be repeated until a satisfactory</p><p>degree of saturation is reached.</p><p>UNDRAINED LOADING STAGE</p><p>Witn-the drainage valve closed, open-the chamber</p><p>pressure valve increase the pressure on the</p><p>díaphragm steadily to tne required value. Recor</p><p>the change in pore pressure, and any settlement</p><p>indicated by the dial gauge.</p><p>The diaphragm pressure p is obtained from the</p><p>equation :</p><p>p = o-' t ��</p><p>Where:</p><p>\</p><p>r:í = desired effective stress</p><p>Uk> = back pressure</p><p>Wait until the readings are</p><p>proceeding further.</p><p>CONSOLIDATION STAGE.</p><p>steady before</p><p>Consolidation is started by opening the drainage</p><p>outlet and at the sarne instant starting the</p><p>clock. Read the following data at time intervals</p><p>(log base or square-root base) similar to those</p><p>used for conventional oedometer test :</p><p>Vertical settlement</p><p>Pore water pressure</p><p>Volume change on back pressure line</p><p>- 10 -</p><p>1</p><p>}</p><p>-</p><p>}</p><p>9. 00</p><p>l</p><p>l</p><p>r</p><p>1</p><p>l</p><p>o</p><p>·1</p><p>o</p><p>[l</p><p>u</p><p>o</p><p>f]</p><p>�]</p><p>[J</p><p>D</p><p>1</p><p>l</p><p>!</p><p>·1</p><p>TEST WITH TWO-WAY VERTICAL DRAINAGE</p><p>With two-way drainage the pore water pressure is</p><p>not rneasured. Both drainage valves are used.</p><p>The deterrnination of each consolidation stage has</p><p>to be judged frorn the settlernent-tirne or volume</p><p>change-tirne curves, in the sarne way as for an</p><p>oedorneter consolidation test.</p><p>-------,.�--_.._ ----·- -- - ...._ "",...,.........., ............</p><p>- 13 -</p><p>J</p><p>. l</p><p>8</p><p>l</p><p>l</p><p>9</p><p>·1</p><p>. ]</p><p>10</p><p>J</p><p>,l</p><p>J �1</p><p>J l_ 12</p><p>13</p><p>[] 14</p><p>[]</p><p>15</p><p>16</p><p>ll</p><p>17</p><p>[]</p><p>!]</p><p>rJ 18</p><p>19</p><p>20</p><p>. ]</p><p>21</p><p>= l</p><p>24581000008</p><p>24582000008</p><p>24583000008</p><p>24581000008</p><p>24585000008</p><p>24541</p><p>24543</p><p>24544</p><p>24540</p><p>24545</p><p>24512000008</p><p>24513000008</p><p>24514000008</p><p>24500000037</p><p>24515000008</p><p>TOP DISC [50 mm)</p><p>[2.5 inch)</p><p>[ 70 mm]</p><p>[3.0 inch]</p><p>[100 mm]</p><p>FLEXIBLE PISTON FOR 50 MM</p><p>[ 2. 5 rnch]</p><p>f 70 mm]</p><p>[3.0 inch]</p><p>l ro·o mm]</p><p>"i=RE tPTSTOlfõD--i-iW</p><p>[2.5 inch]</p><p>[ 70 mm]</p><p>[3.0 inch)</p><p>[100 mm]</p><p>�- --</p><p>-·-• -- ·-·--, .</p><p>-··--··-·----- ------�-----····-· ·- -</p><p>24500000011 FLAT NUT</p><p>ÚJ' 6 V' C,-- ('J'·--c_. -��</p><p>24500000010 CAP � ...•. ----···-</p><p>----· -- · -------------</p><p>---·</p><p>24581000013 CENTRE DRAIN SCREW</p><p>24581000014 SAMPLE CLAMP STUD</p><p>24251000018 GAUGE COLUMN</p><p>24581000016 FOOT</p><p>24512000006 TOP FILTER 50 MM</p><p>24513000006 [2.5 inch]</p><p>24514000006 [ 70 mm)</p><p>24511000006 (3.0 inch)</p><p>24515000006 [100 mm)</p><p>24581000018 CAP</p><p>24251000026 COLLAR</p><p>24251000022 GAUGE BRACKET</p><p>24251000023 BRACKET SPINDLE</p><p>- 19 -</p><p>l</p><p>J</p><p>'l</p><p>l</p><p>l</p><p>.l</p><p>'J</p><p>J</p><p>J</p><p>íl</p><p>J</p><p>J</p><p>J</p><p>:J</p><p>� j</p><p>o</p><p>� l</p><p>J</p><p>J</p><p>J</p><p>7</p><p>HYDROCON WITH CENTRAL</p><p>PORE�PRE&SURE PORT</p><p>- 21 -</p><p>- GG -</p><p>------:-�----------- -------------···-::::.:c-.:.=:=::::-=:-_--=_-::::.</p><p>:,:</p><p>;;.</p><p>�:</p><p>,;-,</p><p>;;.</p><p>*</p><p>�</p><p>,,</p><p>--</p><p>;.� � .</p><p>Q "E.. -·</p><p>'"':</p><p>•! .,.</p><p>. 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