Statistical Analysis On Physical And Mechanical Properties Of Geotechnical On Band Of Xi'an Ground Fissures

Since 1960s, Xi'an ground fissures'damage to the constructions has been found. Nowadays,14 ground fissures(from north to the south,they named f1～f14) and 4 secondary ground fissures(f5′,f6′,f9′and f11′) have been found in Xi'an area.With the developing of construction, the ground fissures have been the main environment geological disaster in Xi'an city. The main method of general building design to the ground fissures is avoid, the main mission of ground fissures reconnaissance is only to determine its location and give a reasonable distance.But subway engineering is different from the general industry and civil buildings, besides the specific of the Xi'an ground fissures, it must pass through some of the ground fissures. How to ensure the subway tunnel in the Xi'an ground fissures in the construction and operation of security, which become a new engineering problem, arising a great attention from engineering and academia. The author analysied the characteristics and the impact of the ground fissures of Xi'an Subway along the line,under the support of Xi'an Metro Line-1 through the ground fissures zone activitly, through the laboratory-scale soil test and testing soil in original position for studying the physical and mechanical properties of the ground fissures. This paper provide references for the structural measures designed.First,this paper described the basic characteristics and activities of the ground fissures in Xi'an. Basing on that, the activities characteristics and the impact of the ground fissures of Xi'an Subway along the line were analyzed. At the same time, it is summed up that hazards of the urban construction and the characteristics of disaster in Xi'an ground fissures.Then, This paper has the intersection of the subway and the ground fissures, selecting Labor road of f3, Lianhu Road of f3, fChaoyang Gate,Kangfu Road of f4 and Xingfu Road of fs,as its research object.By spinning and geotechnical drilling on both sides of the ground fissures with a large number of samples for geotechnical testing and indoor CPT such as in situ standard penetration tests, a great deal of data were achieved substantially and credibility.Finally, the physical and mechanical parameters of the laboratory-scale soil test and testing soil were in-depth Comparative statistical analysised, and the form of a chart showed that the Xi'an ground fissures with physical and mechanical properties of rock and soil are significant differences on the 15 meter of below of the surface of the earth and in 20 meter of width of the surface of the plane specially.