AI SearchInstrumentation for the measurement of subsidence in Bangkok
Call Number: AIT Thesis no.1290 Material type:
TextSeries: Asian Institute of Technology. Thesis ; no. 1290Publication details: Bangkok : Asian Institute of Technology, 1978Description: 142 pSubject(s): Online resources: Dissertation note: Thesis (M.Eng.) - Asian Institute of Technology, 1978 Summary: The instrumentation in land subsidence investigation is commonly carried out to measure the absolute subsidence, compressions of sub surface soil layers and pore water pressures. The details of various instruments that have been installed in many subsidence areas over the world are reviewed and summarized. They are also categorized according to their methods of measurement and functions. The absolute subsidence can be measured with respect to a fixed surface level or a deep, hard stratum, or by satellite remote sensing. The compressions of soil layers can be measured by means of compression indicators, which can be classified as compression type, extension type or precision extensometer type. Pore water pressures can be observed, either by observation wells (in sand stratum) or piezometers (in clay stratum). Based on the evaluation of these instruments, surface levelling and compression type compression indicator are proposed for the observation of ground surface subsidence in the Bangkok area. In order to observe the pore water pressure declines in the upper clay layer, open stand pipe piezometers have been installed at five locations in Bangkok and the adjacent areas. One of these locations is in central Bangkok, two are in the areas about 20 km from central Bangkok and the other two are in the areas about 40 km from central Bangkok. Considerable drop in pore water pressure was observed at these locations. The maximum decline was observed in central Bangkok and the decline is relatively small in the areas farther away. It was found that the magnitudes of pore water pressure decline in central Bangkok are 15.5, 11.5 & 1.5 t/m2, and the rate of decline are 2.0, 1.5 & 0.2 t/m per year in the upper sand layer, Stiff Clay layer and Soft Clay layer respectively. Development and installation of the three types of compression indicators has also been tried at AIT campus in order to assess their performances.
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A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand
Thesis (M.Eng.) - Asian Institute of Technology, 1978
The instrumentation in land subsidence investigation is commonly carried out to measure the absolute subsidence, compressions of sub surface soil layers and pore water pressures. The details of various instruments that have been installed in many subsidence areas over the world are reviewed and summarized. They are also categorized according to their methods of measurement and functions. The absolute subsidence can be measured with respect to a fixed surface level or a deep, hard stratum, or by satellite remote sensing. The compressions of soil layers can be measured by means of compression indicators, which can be classified as compression type, extension type or precision extensometer type. Pore water pressures can be observed, either by observation wells (in sand stratum) or piezometers (in clay stratum). Based on the evaluation of these instruments, surface levelling and compression type compression indicator are proposed for the observation of ground surface subsidence in the Bangkok area. In order to observe the pore water pressure declines in the upper clay layer, open stand pipe piezometers have been installed at five locations in Bangkok and the adjacent areas. One of these locations is in central Bangkok, two are in the areas about 20 km from central Bangkok and the other two are in the areas about 40 km from central Bangkok. Considerable drop in pore water pressure was observed at these locations. The maximum decline was observed in central Bangkok and the decline is relatively small in the areas farther away. It was found that the magnitudes of pore water pressure decline in central Bangkok are 15.5, 11.5 & 1.5 t/m2, and the rate of decline are 2.0, 1.5 & 0.2 t/m per year in the upper sand layer, Stiff Clay layer and Soft Clay layer respectively. Development and installation of the three types of compression indicators has also been tried at AIT campus in order to assess their performances.
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