Study On The Ground Fissures In Hebei Plain

Through great field investigation , entirely researching , collecting and clearing up the distributing character of ground fissures of the south of Hebei plain which is about 60,000 km2 including seven cities ,suchas ,Langfang,Baoding,Hengshui,Shijiazhuang,Xingtai and Handan , summarizing the status quo of Hebei Plain, the activity character of ground fissure .concluding the influencing factors that lead to form tectonic ground fissures. At last analyzing the hazards of ground fissure of Hebei Plain and harmful status quo, briefly estimating the ground fissure hazards of Hebei Plain.Collecting seism datum(Ms 3.0)which amounts to about 3000,and analyzing the relativity between ground fissures and earthquakes; discussing the tectonic foundation of ground fissures formation and formation mechanism of ground fissures.Utilizing enough ground fissures datum,the tectonic stress field via finite element method and the grading of the active chances of ground fissures, forecasting the development of ground fissure. Finding out the development period of ground fissures, and forecasting the developmenttrend of the ground fissures; finding out and locating the sensitivity places where the ground fissures are liable to take place. Through analyzing and researching the Physiognomy map of Hebei Plain> the fourthly epoch map of Hebei Plain> Engineering geology map of Hebei plain,Hydrogeology map of Hebei Plain.Lithology map of the fourthly epoch and ancient watercourse map of Hebei Plain ,achieving the fixationfactors that control the arising and development of the ground fissures, such as, the earth's crust tress , the fourthly epoch lithology , the chancingof ground water table, active faults and ancient watercourse, and alsomaking sure the exponents of each factors; researching random factors, such as, precipitation .and agriculture irrigation, and making sure the exponents of each factors too. At last making the foundation map(1: 500,000) of arising degree of ground fissures about Hebei Plain via those fixation factors, utilizing the map to forecast and analyze the development trend of ground fissures of Hebei Plain .