The Research Of Hydrology Geology About The New Steel And Iron Flat Project

With the development of social and economic, in order to adapt to the people's demands on production and living, more and more large-scale construction projects are carried out. But because the conflicts about the land between the agricultural and production and the requirements of environmental protection, large-scale construction projects are often in the areas which are complex in geological, topographical conditions. So these region's ground water condition also becomes complex.In the construction process, the surface water and the ground water will be perturbed, and change their conditions of recharge, runoff, excretion. If these circumstances are out of control, the surface water will possibly submerge the location in the flood period, which will seriously influence factory district regular production; The ground water will gather in the location, soaks the foundation soil (particularly reclamation soil). The intensity of the foundation soil (particularly reclamation soil) reduces. The location's stable will be subjected to threat, and the workshop and the other implementations won't be operate in normal. So how to make the simulation to the groundwater seepage field and forecast the water inflow more accuratly can provide the basis for making the reasonable measures to against drainage in the large-scale construction location, and become one of the topics of increasing concern.This paper takes the changes of the groundwater in one of steel flat in Xichang in plans as the research object. On the base of previous studies, the paper studys the groundwater to the large-scale construction projects's influences, and proposes the concept of Hydrology geology in the projects. On the bases of field geological surveys and analysis of regional hydro-geological characteristics, the paper sets up the conceptual models and the mathematical model. By using GMS software and the finite difference method, the paper imitates the changes of the groundwater in the location in numerical simulation, and predicts the chages of the groundwater seepage field and water inflow in the conditions of the location in flat and drainage systems are carried out.The research shows that:1. In one of Metallurgical base in Xichang plans to construct, the genetic type of the groundwater's dynamic belongs to the Weather-type and the atmospheric precipitation is the main supply source.The mode of run-off is the wave-state type and the groundwater's run-off has a certain depth, length and has the obvious zonation. The discharge of groundwater is mainly lateral excretion and the spring water gushing.2. In the field the groundwater in the aquifer level mainly Supply by the surface water and the rainfall, but in the confined water layer the groundwater mainly Supply by the rainfall. The hysteresis quality for the rainfall recharge to groundwater is obviously. In the Xigeda group clay stone and siltstone interbed, and the clay stone jointing crevasse is growth, so in the field the groundwater's recharge, runoff and drainage conditions is extremely complex. According to the positions of watershed and the secondary watershed, the groundwater's recharge, runoff and drainage conditions, the field may divide into three relatively independent geohydrologic units:Luojiagou geohydrologic unit, Fanjiagou geohydrologic unit and Wangjiacun geohydrologic unit. According to the geological background of the study area and hydro-geological characteristics, the study sets up the hydro-geological conceptual model and mathematical model in the simulation area, and by means of repeated calibration and scheduling, which obtained a set of hydro-geological parameters (permesbility coefficient and specific yield etc.).3. The paper made the comparisons to the groundwater seepage field of the site before and after the formation in the numerical simulation, and analysed the results. (1)After the site formated, the groundwater level falls by 8～30 metres in the earth cutting area; the groundwater level rises by 7～22 metres in the spackling area.(2)The ground water divide between Luo Jia Gou hydrogeologic units and Wang Jia Cun hydrogeologic units won't be obvious. After the site formated, some slopes will be not stable, on account of the height of water and the greater pressure on groundwater seepage in the slope.4. The paper made the comparisons to the groundwater seepage field of the site after the formation and the drainage systems setted, and compared with the measured values, and analysed the results.(1)After the drainage systems setted, the groundwater has been significantly decreased. Especially around the drainage systems, the groundwater decrease to 4～12 metres. The errors between the measured values and simulation values are in the allowable range. The groundwater level has been effectively controlled, so the drainage systems are valid.(2)The water inflow is 1452.22m3/d in the utter of 1#; The water inflow is 271.36m3/d in the utter of 2#. They both surpass the actual value slightly. Along with the site construction, for example hardened surface, the recharge will be reduced, so the water inflow everyday will decrease and eventually stabilize.