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Xi'an ground fissure is typical geological disasters, various types of engineering and construction, transport facilities, urban lifeline engineering and land resources cause damage to the ancient city of Xi'an in the past has been the construction of the city brought huge economic losses. At present, Xi'an subway construction is at, the number of subway lines across the fissure, to solve the structure and ground fissures with waterproofing design and construction of Xi'an Metro become a key problem. Xi'an Metro Line section of North Street in the construction process occurs Bay Sand and precipitation difficult issues, seriously affecting the planning and construction of the subway. Therefore research fissure zone soil infiltration properties, master ground fissure zones of groundwater migration characteristics, contribute to the subway construction dewatering rational design, but also helps ground fissure zones engineering structures and waterproofing measures optimize the design. With the author's participation in the labor Metro Line Road Primary School Cross-earth fissure hydrogeological test results and previous data, first test site topography, structure formation, geological structure and hydrogeological conditions were introduced, and then the test program design, including pumping wells and observation hole layout, structure and construction technology, test pilot programs seepage pits, drilling precipitation head injection test program and pumping test program. Secondly, this test pit seepage test, respectively, the first injection test drilling and pumping precipitation test procedures are described in detail. While taking advantage of a variety of ways to organize and analyze the test data. By pumping test results to the maximum permeability fractured zones, the lower plate, followed by the minimum on the plate, ground cracks down two hydraulic connection is weak, two sources of groundwater recharge may be different, ground subsidence caused by pumping tests focused on the ground cracks belt. Finally, through the many aspects of the hydrogeological test results were analyzed. By ground fissure with soil physical and mechanical properties of studies have found that the nature of the soil site footwall little difference faulted aquifer led down two hydraulic connection is weak, by the finite element software building ground fissures on the plate applied to the soil of the site impact analysis, the results showed that: a building ground fissures on the plate load imposed on the soil causing changes in the nature of the soil, affecting the test results, leading to water supply on the plate is more difficult, permeability coefficient partial small.
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