| 摘要 |
PROBLEM TO BE SOLVED: To extract a location causing ground subsidence which is not accompanied by the deformation of an underground structure, in the upper ground of the underground structure. SOLUTION: An extraction section 15a performs first determination processing of determining whether or not an extracted location is a location where a hydraulic gradient may be generated between the ground of the upper section of the underground structure and the inside of the underground structure, because the ground of the upper section of the underground structure is put into the state of being saturated or almost saturated with groundwater and percolating water, and second determination processing of determining whether or not an extracted location is a location where deposits different in solid state come into contact with each other in the ground of the upper section of the underground structure, by using area information and various set values stored in an area information storage section 14a and a setting condition storage section 14b. The extraction section 15a computes a total score by sequentially adding a score indicating the degree of possibility of subsidence, depending on the result of each determination processing, and compares the computed total score with the predetermined set value, so as to extract the location (depressed location) where the degrees of the occurrence of the subsidence are classified. COPYRIGHT: (C)2011,JPO&INPIT |
