Monitoring,Evolution And Self-healing Characteristic Of Land Damagedue To High Tension Coal Mining In Windy And Sandy Area

With the strategic westward movement of China’s coal industry, the land damage due to coalmining in windy and sandy area has became a research hotspot, however, two distinguisheddifferent opinions of this area for many scholars are represented. Based on previous research,utilization of surveying and mapping, mining subsidence, geology and soil science, the evolutioncharacteristic of surface environment of typical coal faces in Shendong coalfield had beenmonitored in the whole process of land damage. The surface movement and deformation and itscommon features of Shendong hard overlaying strata had been revealed, then self-healingcharacteristic of surface subsidence due to high tension large coal face mining was quantitativeanalysis by subsidence simulation. A new method was invented to monitor dynamic fissuredevelopment, and then its self-healing feature of fast closure was found. The function model ofdevelopment cycle T and mining geological conditions had been established. In additional, thedevelopment rule and distribution characteristic of marginal fissures were also revealed. Byexcavated typical filled-fissure, its extension form in the shallow underground space had beenacquired combined by high-frequency ground penetrating radar systems and lensphoto close-rangephotogranunetry technology, which could provide some information for ground fissure treatment;Moreover, the variation and some self-healing feature of soil physical and chemical properties hadbeen revealed by multi-phase soil sample in subsidence area and control area. Based on above studies, the self-healing ability evaluation model of land damage in windy and sandy area hadbeen built, thus, a new kind of “partition” differentiated ecological restoration mode had beenrepresented for similar area.