Page - 908 - in Book of Full Papers - Symposium Hydro Engineering

where jc is the central value of the Gaussian function corresponding to the j hidden layer unit; j is the central width of the Gaussian function corresponding to the j hidden layer unit; N is the number of the total nodes of the hidden layer. 3. ENGINEERING APPLICATION 3.1. BACKGROUND A hydropower station is located in Cambodia, and the water-retaining structure is a RCC gravity dam. The crest elevation of the dam is 153.00m, the bottom elevation is 41.00m, the maximum dam height is 112.00m, and the width of the crest is 6.0m. There is a folding point located upstream at 145.00m elevation with the slope of 1:0.75. This RCC gravity dam has 10 sections from the left bank to the right bank. In order to monitoring the horizontal displacements of the dam foundation, six reversed pendulums (numbered IP1~IP6) were installed symmetrically at abutment sections (at EL153m, EL120m, and EL88m). Two reversed pendulums (numbered IP7~IP8) were installed at riverbed sections (at EL43m and EL60m). In this section, the monitoring data of IP4 from September 2, 2014 to December 7, 2017 is analyzed as an example: the 126 groups of data from September 2, 2014 to June 24, 2017 are set as the training sample and the 21 groups of data from July 7, 2017 to December 7, 2017 are set as the testing samples. 3.2. SELECTION OF PRINCIPAL COMPONENT The main components of the displacement at the measuring points can be identified as a linear combination of three effects: the hydraulic component   H t , the temperature component   T t and the irreversible component   t  .       H Tt t t        [2] The hydraulic component   H t is related to the types of concrete dam. In this example, three factors are selected as: 1 0X H H  , 2 2 2 0X H H  and 3 3 3 0X H H  . 908