Study On The Supergene Geo-environmental And Analysis Of The Risk Effects Of Mining, In Shahecity

There are abundant mineral resources in shahe city, the development of mineralresources will play a significant role in socioal development，but unreasonable exploitationwould not only destroy the water、soil resources and ecological environment, but alsodamage the residential environment in the neighborhood. The mining history in Zhaoyaomining of Shay he city is complicated, most of iron ores are unscrupulous plundering, mostcultivated land was affected by collapse of mined-out area, almost half of the land was hardfor growing, the rest was now downgraded to dry land by the canal subsidence. Mined-outregion have changed the geological environment, it seriously affects the land resources,vegetation resources, water resource, living environment. Based on this phenomenon, thepaper was focused on Zhao yak Mining, study mineral area supergene geologicalenvironment, genesis and effect.Through collecting geography、 meteorological and hydrological, geologicalstructure,hydrology, engineering geology and mining technology and so on, combiningfield survey、measuring and High Density Resistivity method，systematically finding outthe supergene geological environment by mining-induced in study area; emphasisly studiedthe current status of land collapse, ground fissures, ground subsidence, carefully analysisthe cause, the format on mechanisms and influence of three problems; High DensityResistivity method was employed to divide the crack zone into stable subsidence area andunstable subsidence area. Finally, by using the Clustering and qualitative analysis,weevaluated the current status of study region, on this basis, made a prediction assessment ofimpacting.Following conclusions were drawn:1、Studies suggested that there had supergene geological environment problems such as landcollapse、ground fissures in this study area, these problems caused there are two large oval collapsebasin and many groups of ground fissures,which are associated relations. T1collapse basin, about1.3km in circuit,0.12km²in area, maximum settlement is aboat12.6m; there arethree collapse pits on the long axis direction, the total volume is9700m3. There are threegroups of ground fissures,15is all together.The flat character mostly likes straight line,fold linear and partial visible arc, with narrow top and wide bottom on the Profile, the widthranging among0.3¹m. T₂collapse basin, about1.3km in circle,0.1km²in area,maximum settlement is aboat9.6m; the widest cracks up to3m, because of the Severeweathering and erosion of surface soil,we can not statistic the numbers and directions,destroyed land is about0.10km².2、The original rock stress distribution was changed, it result in The supergenegeological environment of ground subsidence and ground fissures, the balance of in-situstress was broken in the mining. When Ore is mined, the balance of the original rock stresswas broken, and that lead to the rock deformation, displacement, cracking and collapse, andeven large-scale movement. With the mined-out area continues to expand, the scope ofmoving rock was corresponding expansion, the surface will deform and move when therock move to it, then sink basin or collapse pit are formed with faults and fractures inpart.3、Geological environmental effects of mining-induced are destruction of land resources,vegetation resources, water resource, living environment. There are850houses appeared tocrack,14villages which the levelling and original farming land were damaged, reducingthe available and cultivated land is about0.1km², Numbers of wells have dried up,6570acres of land lost its irrigation capacity, which caused direct economic losses aboat15.25million.4、We forme into two major control regions according to the above results. The mostserious area on environmental impact mining of chocolate, which included land collapse、ground fissures、ground subsidence distribution area,about0.28km²in area. In this area, it isdifficult to manage and restore because of the harmful levels is so large. The more seriousarea, which are impacting region of land collapse and ground fissures, about0.23km²in area. Compared with the first area, the harmful levels is moderate,it is easy to manage andrestore.