Research On Reinforcement Efficiency Of Different Anchorage Parameters In Large Roadway Of Coal Mine Transportation

In the underground engineering of coal roadway, roof caving roadway lane easily occurred, the bass drum and roof of the cave is extremely common. The mining depth of mine now is increasing; roadway and stope ground stress level is becoming more and more high, and degree of deformation of surrounding rock of roadway is serious and complex failure. As mine laneway bolting technology and other underground engineering supporting the main supporting form, bolting technology is playing an important role in the safety of roadway.In this paper, the sample is taken from the working face of heng sheng grass ditch coal mine about the transportation roadway of the first rock mining area. Data collection and sorting is completed on the scene, and the sample is analyzed in the laboratory, we acquire the rock specimen in uniaxial compression and triaxial compression stress- strain curves of two kinds of circumstances. At the same time,Roadway model is established by Flac3 D to research the change law of stress,displacement and plastic zone of roadway with the change of anchor length and the distance, the analysis of surrounding rock of roadway anchor reinforcement effect,different length of anchor when change the spacing to improve the stress of the roadway,limit deformation, improve the surrounding rock of caverns, the effects of static load.Main research results of the paper are as follows:(1) Combined with the existing rock mechanics, mechanics of elasticity and the mature research results, respectively arched tunnel model are used to analyze the stress state and failure model separately, in the end, introduced the calculation formula of stress value and get the anchoring parameters which make influences on the stability of roadway. Embedded the language code which get from FLAC3 D in Fish to the simulation program to calculate and analyze.(2) The characteristics of the anchor rod anchor are introduced as well as the basic principles of selection, anchor of anchor rod mechanism and the relationship between bolt and surrounding rock. Analysis of surrounding rock of roadway bolt support and the anchorage parameters is done, with the mechanism of the surrounding rock under the different length of anchor rod anchor and the location of the arbitrary point of compressive stress state. In carries on the design of anchor supporting ofroadway, the most value of roof bolt support parameters calculation, cause in the lane to help anchor supporting applications lack the necessary theoretical basis. It is very important to determine the bolting parameters in design in the bolt supporting, deduce the anchor bolt length formula in roadway according to the plastic circle theory, and deduce the anchor spacing in roadway by analyzing mechanical model.(3) The physical and mechanical parameters are numerically simulated experiment. The physical and mechanical properties of rock sample was determined.The main contents can be included as follows: uniaxial and triaxial compression stress-strain curve, compressive tensile strength and modulus of deformation. According to the measured buhrstone, the limestone Mohr's circle is made, and the consistence coefficient of coal sample is measured at the same time. FLAC3 D and the basic working principle are introduced, roadway model is set up, according to the stress nephogram, under static load is analyzed, and the length of the anchor rod in 3 m, 6m,9m, spacing, respectively, to 30 cm, 60 cm, 90 cm anchorage of the plastic damage area,and the vertical displacement and stress changes of the cloud, we get that the relationship between stress and displacement, plastic zone and the relationship between the displacement, and summarizes the change of the stress of the roadway surrounding rock stress changes, the change of the horizontal displacement and plastic zone, get for roadway support, choose reasonable anchor length and spacing can achieve good supporting effect.(4) Developed a observational plan of a mining area rock transportation tunnel by on-site measurement to observe the closer speed and the mount of roadway roof and floor and two help. It is fulfill requirements to guarantee the stability of the roadway in anchored which anchor length is 3m and anchor distance is 30 cm. But from the perspective of cost-saving, using the 60 cm bolt spacing Reinforcing the transportation alleys located in the one mining are.