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

Since 1970s, there are several ground fissures appearing in Xi'an area, as a result of natural and anthropogenic factors. Xi'an subway acrossing ground fissures will bring out security threat on construction and operation of it, 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 of all, 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.secondly, This paper has the intersection of the subway and he ground fissures as its research object , selecting labor f3, Lianhu Roadf3, Chaoyang Gate and rehabilitation Road f4, the well-being of North Road at the junction f5 and f6. 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 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. The same of stratum on the hanging and lower walls of ground fissures were contrasted with the high of water content and the low of dry unit weight and the fall of shear strength in evidence. And the different of the physical and mechanical properties of he hanging and lower walls of ground fissures zone is lower with the increase of depth gradually.