1、Deep Mine Rockburst and Control MeasuresLI Qiu-hui(Xinjian Coal Mine, Qitaihe Cleaned Coal Group Comp., Qitaihe 154600, China)Abstract:Coal mine rockburst showthe characteristics of diversity, sudden,dangerous and universal. The oc-curred natural conditions of rockburst are the mining depth, the geo
2、logical structure and the physical and me-chanical characteristics of coal seam roof and floor rock.The fundamental measures of preventing shock pres-sure is eliminating the occured conditions at the same time taking the protective measures.Key words:coal mine; deep mine; rockburst; roadway; mining
3、technologyPreface Mine or the surrounding coal and rock face, as the instantaneous elastic deformation energy release of severe damage caused by a sudden burst power is called. It is in the high stress state occurs, the state of elastic energy accumulated a large number of sudden coal and rock mass
4、destruction falling or thrown to the sudden release of energy, and is accompanied by sound, vibration and shock, also known as coal or rock burst explosion. Mine burst has its distinctive feature, to take effective preventive measures. 1coal mine show the characteristics of burst (1) sudden. No prec
5、ursors before the occurrence of the general, the impact of the process of short duration from seconds to tens of seconds. (2) diversity. The general performance of coal explosion, the impact of shallow and deep impact. Explosion occurred when coal, coal wall burst, and with a small lump projectile b
6、ody phenomenon; shallow coal wall impact occurred in the range of 2 6 m; deep shock, deep in the coal, sound like muffled thunder, but the extent of the damage in different . The most common is the impact of coal, but also the impact from the roof and floor rock. The impact of the coal, the most per
7、formance for the coal out, it showed a few tens of square meters of coal a whole movement, and accompanied by great sound, vibration and shock rock. (3) risk. Burst extremely serious harm, not only affect the normal production, but also a serious threat to the safety of underground workers, occurs o
8、ften results in Rib, roof subsidence and the base drum, frame folded, equipment moving, roadway congestion and casualties. (4) universality. Natural geological conditions, in addition to a variety of other lignite coal has burst records, mining depth from 200 1 056 m, from the simple to the complex
9、geological structure, coal from thin to thick, angle from horizontal to inclined ; roof including sandstone, limestone, and even oil shale, have burst occurred. Conditions in the production technology, water mining, blasting mining, conventional mining and mechanized mining, all caving method or hyd
10、raulic fill method, and other mining processes, long wall, short wall, Lane column, slicing, horizontal layers, down the steps and floor-type and other mining methods, have appeared burst. 2 . burst occurred because of the theoretical analysis and 2 1 Burst Theory 1.strength theory Early strength in
11、 the destruction of coal and rock-oriented reasons, that the roadway and the stress concentration around the mining site, when the stress reached the ultimate strength of coal and rock, the sudden destruction of coal and rock to form a burst. Modern theories emphasize the importance of strength of a
12、 rock ore body limit equilibrium of the mechanical system analysis and assumptions, the representative theory of coal is gripping. The theory is that the harder coal roof and floor can be clamped, clamping hampered coal deep coal itself or coal unloading of a rock at the junction of deformation. Not
13、 only produce coal with high clamping stress concentration and very high elastic energy storage, and high pressure and high elastic energy accumulation area is located near the coal wall, and the carrying capacity reserve is small, once the high-stress resistance suddenly increased or the system sud
14、denly reduced, the coal can produce sudden destruction and movement, threw space has been taken to form a burst. Therefore, the occurrence of burst strength of coal and rock mass stress conditions to be equal to or greater than the strength of coal and rock system. 2. energy theory Energy theory tha
15、t the burst occurred requires a lot of energy, not only the ore body to release energy, rock also release energy. With the mining proposed expanding the scope of the ore a rock equilibrium system in the mechanical damage, it can release energy than the energy consumption occurs when burst. 3.the imp
16、act of orientation theory The theory of impact trend of coal and rock media capabilities with impact damage as the impact of the tendency of the impact of coal and rock media tend to be available through the experiment and the measured mechanical properties of indicators or indicator groups to measure, these indicators reflect the occurrence of coal and rock burst medium possible level, known as the degree of impact trend. Burst occurred on conditio
