Pore water pressure measurements (Piezometer):-Monitoring equipment: The pore water pressure gauge consist of a filter is connected to a vertical pipe to the surface. A layer of clean sand saturated water wrapped around a filter at the bottom of the drill hole. A layer of bentonite are hermetically separated layer above the sand to empty water pressure at the top of the filter. When the pore water pressure increase or decrease, the water level inside the tube stands also increased or lowered. The height of water on the top of the pore water pressure filter.-Frequency measurement: The contractor must pore pressures monitoring using piezometer tools once a day for seven days after the first installation, and in the process of building the reference. Then the water level observations should be twice per week in the first month, and then every week until the end of the period of weakness, or as directed by the engineer. The number of a monthly reading must be taken through the end of the contract period. During the continuous rain, the water level must be monitored daily for a period of time as directed by the engineer.-Data processing: The water level in the measurement of pore water pressure is measured by instruments for measuring water levels. Water level measuring instrument consists of a probe, a cable marked mm, cable winches and attached to the electronic equipment. The probe was dropped on the tube until the lights and Horn signals have been exposed to water. The depth marking on cables just measure water levels.-Establishment figures: charting observation.
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