최소제곱법을 이용한 4개의 CSL 검측공 위치 결정

Determination of 4-CSL borehole locations by using a least squares method

  When four boreholes are installed in the cast-in-place pile, coordinates of the boreholes are obtained by using a least squares method, utilizing six hole-to-hole distance measurements. In addition, most probable values of hole-to-hole distances are calculated with coordinates of the boreholes. With the knowledge of borehole coordinates sound velocity of the pile can be obtained more accurately, and the cross section of the pile can be drawn with the drawing program easily. Also, coordinates of the boreholes would be very useful when a horizontal tomography technique is applied for integrity test of the cast-in-place pile.