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The analysis of soil nail support technology under different geological conditions 1 The soil nail reinforcement in soft surrounding roadway For the soft surrounding rock of roadway maintenance,it has always been the most difficult to conquer links of engineering construction.Due to the soft surrounding rock deformation easily,reliable performance is poor, so it is not easy to maintain, cost is large, so the mine work will have a big impact on the safety, ordinary anchor bolt support has already could'nt solve the problem of the protection of the soft surrounding rock.For soft rock supporting require a higher technology maintenance way, anchor reinforcement. Anchor reinforcement is injection, the use of hollow anchor grout injection to them, lose in the surrounding rock, and thus to add easy loose or cracked surrounding rock Solid, thus improved the strength of the surrounding rock, to the stress of the roadway is also reduced, which can keep the surrounding rock stability of the state. 2 Anchor net and anchor rope combined support for composite caving roadway Composite roof support work is relatively complicated, because of its soft base, the binding force between the rock formation is very low, general bolt Measures of anchoring ability is limited, if the roof collapse induced by will easily.So to solve this problem, we have to adopt the anchor belt net with anchor cable group Support technology, this technology is the use of bolt, steel band, metal net work together, to consolidate the top, to maintain the integrity of the roof to prevent collapse Trapped, and because the anchor cable can take some load of the rock, then more solid the roof. 3 The caving mining gateway uses the soil nail anchor combined support Fully-mechanized working face in two consecutive low compressive strength of the surrounding rock roof, and once under pressure, is prone to falls off phenomenon.For instance,By several kinds of in-situ stress, under the joint action of the top-coal is easier abscission of consequences, the unit weight of several kinds of in-situ stress were the top strata pressure,Geological tectonic stress and mining stress concentration.Therefore, in order to avoid the loss, we have to use bolt support measures, still need to add anchor cable, make whole To the roof rock of coal seam is more stable.In general, join in rock anchor cable length from 1 to 1.3 m, and the distance between layers of 4 ~4.8 m. 4 at the end of the fully-mechanized face mining anchor net supporting Geometric volume is larger, due to the similar working equipment tonnage is heavier, so want to work harder for removal process, need to empty Is very wide, between the removal of the maintenance of the standard is higher, so the application of anchor net supporting technique to solve this problem.By using this technology, not only the effect is obvious,Advanced technology, reasonable and convenient construction and economy. (3) for bolt and roof bolt, to follow the head-on avoid due to long time don't support roadway to fold to help. (4) when the drift Angle changes, can be adjusted through the roof in the middle of soil nail supporting, and the distance from center line to meet the technical specification.
http://www.girlscene.nl/blog/49772/the_special_soil_nail_supplier_from_china_-_sinorock
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