03638nam a2200385 4500 20260818143442.0 250398 th eng .b10365047 AIT Thesis no.1290 Kiattisak Thammakumpee Instrumentation for the measurement of subsidence in Bangkok Bangkok : Asian Institute of Technology, 1978 142 p. Thesis ; no. 1290 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. Subsidences (Earth movements) Thailand Bangkok Brand, E.W., Chairperson Holmberg, Soren, Examination Committee Prinya Nutalaya, Examination Committee Government of Australia, Scholarship Donor Asian Institute of Technology. Thesis ; no. 1290 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B22896 .b10365047 mnait x 251014 2 951012 m a x 0 mnait mnarc 22 40 Barcode : 30050120586507 CREATED : 2014-10-02 RECORD # : i12760511 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160082896 CREATED : 2016-11-05 RECORD # : i12976489 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 61253 61253 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.1290 30050120586507 2026-08-18 14:34:42 2 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.1290 30050160082896 2026-08-18 14:34:42 2026-08-18 40