Field-test Research On The Interaction Between Water Level Fall And Ground Fissure

In recent years, ground fissures and land subsidence as a city of geological disasters have brought huge economic losses to the construction of the city and the harmfulness is increasing step by step due to the proliferation of urban water, which Xi’an is the most remarkable city. Where a basic consensus through in-depth investigation and study formed: Xi’an ground fiss-ure is controlled by structural factors, while recently, ground fissure activity increased was mainly caused by the exploitation of groundwater, but the how over-exploited groundwater affect ground fissure activity and how the groundwater movement affected by ground fissure paranormal activity are still inconclusive.This article summary the water level difference phenomenon between two walls among dif-ferent ground fissures and different geomorphic units in Xi’an and analyzed the reasons based on the geotechnical investigation data of Xi’an 1-5 Metro Line and the pumping test data of la-bor across the Laodong road ground fissures test. Firstly, compiling statistics of the water infl-ow of Xi’an ground fissures and analyze the difference between upper and foot wall gushing water. Secondly, calculate the permeability coefficient by using the method of dupuit equation, k00 method and water restoration. Calculate the radius of influence by adopting the stability of the S-lnr graph method and analyze the dual character of water insulation and permeability thr-ough their differences. Finally, Analyze the phenomenon of the ground fissure activities affe-ct diving water migration field by comparing the contour map of groundwater, water analysis and settlement observation contour map.At last, this paper use Geo-Studio software to simulate the influence of ground fissure activ-ty due to the pumping, while verify the difference compaction settlement caused by pumping; then, verify the dual character on water insulation and permeability of ground fissure through the simulation of the effect of ground fissure on groundwater migration.