Lability Zoning Study And Countermeasure Of Geological Hazard

Deeply analyzing and absorbing the ideology and methods of current space zoning of geological hazard, taking Nanjing county as an example, basing on the original geological hazard investigation materials, the paper study an important problem - geological hazard labile zoning.First, the paper summarizes the main factors that control the gestation and appearance of geological hazard of Nanjing county, according to the spot investigation.At the beginning, the paper pictures the background of Nanjing county from regional national geology and geo-environment. Then, make a detail statistic for current hazards, including landslide, earth slide, unstable ramp, mud and stone flow and collapse structure. From the space viewpoint, the high hazard density distributes in the north part (Hexi, Kuiyang, Meilin) and the midland (Chuanchang, Nankeng, Shuyang, Jinshan, Longshan). But in the south and southeast parts, the hazard density is much less. From the physiognomy character, one is that geological hazard happened mainly at the interval from altitude 80 to 800 (m), aggregating to 91.7%; the other is that hazards mainly locate at the ramp whose obliquity is 25-45° , adding up to 62.5%. From the time viewpoint, the hazard frequency increases obviously from 1998 and the happened time centralizes in these months from 5-8, occupying to 55.1%.Second, on the base of traditional disturbance coefficient method (DCM), the writer quantifies the geology environment factor; adds it into the above method, then get the amendment disturbance coefficient method (ADCM) with the form R=a~2+b~2+c~2+d~2.The writer notices the point that traditional DCM only takes account of historical point density, area density, and cubage density. But the traditional method neglects the importance of geology environment - the gestation and development background of geology hazards. So the writer uses the multiple factor weight average to quantify the environment factors and get the formulation R=a~2+b~2+c~2+d~2. Taking Nanjing county as an example, using the method, the paper get a conclusion that the high lability is 5.5%, the middle lability is 28.0%, the low lability is 38.9%, the non-lability is 27.6%. It proves that the ADCM is practical and reasonable.Third, absorbing and understanding the essence of disturbance coefficient ideology, taking the fuzzy math as a tool, the writer binges forward the fuzzy - disturbance method for the hazard space division.The writer understands that the essence of disturbance is point density, area density and cubage density and recognizes that the essential difference of lability is the partition of the density and the given criterion is only a mathematical shape. So the writer extends the fuzzy math, adds the nearness theory, puts forward the viewpoint that the environment can be taken as an index and added to the density module. Using Nanjing county as an example, by the method, the paper get a result that the high lability is 4.8%, the middle lability is 25.1%, the low lability is...