(1. Research Center of Mining Damage and Control Engineering, Liaoning University of Engineering Science, Fuxin123000;
2. School of Mining of China University of Mining and Technology; Technology, Xuzhou, China 22 1008)
The main method to solve the surface subsidence caused by mining is to deal with the coal mining space reasonably. The technology of "controlling roof and overlying strata movement by high-pressure grouting fly ash water mass in mining caving area" is one of the treatment methods. A special material, 1, is formed after grouting the fly ash water mass in the goaf, which is used to support the roof and effectively control the subsidence of the overlying strata. In order to accurately calculate the mining subsidence of roof under grouting condition, according to the characteristics of this kind of material, its constitutive equation is established on the basis of certain assumptions. The deformation calculation method of composite strata supporting overlying strata is given, which provides a basis for practical engineering.
Calculation of overburden subsidence after grouting and popularization of grouting technology in mining area.
Keywords mining caving area, grouting, composite rock, compression, overlying
Rock control
brief introduction
The surface subsidence caused by mining not only destroys the ecological environment of the mining area, but also destroys the buildings and structures on the surface, causing serious safety hazards. The main method to solve these problems is reasonable planning. Ess coal mining space. Different from the traditional hydraulic filling method of goaf, the broken rock grouting-
In the paste grouting of mines and metal mining areas, some scholars put forward the technology of "controlling the movement of roof and overlying strata by high-pressure grouting of fly ash water mass in goaf caving area" to control the movement of roof and overlying strata, thus reducing the surface subsidence. The basic principle of this technology is to design a subcritical accurate working face in the mining area. Draw a grouting corridor parallel to the working face road above caving zone, and arrange centralized grouting pipes in the grouting corridor above caving zone. Drill a hole in the rock at regular intervals and go deep into the cave area. The borehole in the rock is perpendicular to the grouting road. It can inject grouting into caving zone with the advance of the working face. Therefore, composite rocks are formed to support the roof, and then the movement of overlying strata is controlled.
Therefore, the top plate control amount is the compression amount of the compound.
Therefore, it is necessary to study the deformation of overlying strata under the action of overlying strata pressure.
Establishment of response function of 1 composite rock material
1. 1 Basic principle analysis The roof caving area is formed after the roof collapses and falls behind.
Caused by mining. Suppose the cracks are filled with water masses. The fracture zone is formed, and a special composite rock beam is formed after grouting. The general beam constitutive model is not suitable for the special composite rock beam because its composition is special 1. Based on the viewpoint of energy, this paper holds that the strain energy of beams is related to stress and internal damage. Based on this. The assumptions about composite rock beams are as follows—
Lower. ① A composite United Nations rock beam is formed in the broken rock area after spraying; ② The beam is made of a released superelastic isotropic material.
Pressure of overlying strata under grouting deformation composite strata in mining caving area
(1. Research Center of Mining Damage and Control Engineering, Fuxin University of Science and Technology, Liaoning Province, 123000.
2. School of Mining of China University of Mining and Technology; Technology, Xuzhou 22 1008, China).
In order to solve the problem of surface subsidence caused by mining, the main method is to use reasonable technology to open up coal mining space. "The movement of overlying strata on the roof is controlled by the fly ash water mass in the grouting filling development area with high pressure" is a simple grouting reinforcement treatment method. In the area where fly ash is sprayed by the mining filling water mass, a special material 1 is used to support the roof and accurately calculate the settlement of the strata. Used for effective control. According to the characteristics of grouting state and mining subsidence, the constitutive equations of grouting and other materials are established, and based on some assumptions of composite foundation, the deformation calculation method is given.
Grouting after settlement calculation of overlying strata and grouting technology for promoting mining in ca area.
Keywords mining caving zone, grouting, composite rock, compression, overlying rock
Rock control
Taizhou
The surface subsidence caused by mining not only destroyed the ecological environment of the mining area, but also caused serious security risks. Surface buildings and structures. The main method to solve these problems is reasonable procedure. Ess coal mine space Different from traditional methods, hydraulic grouting in mined-out area of broken rock mass-
Some scholars put forward that "high-pressure fly ash grouting is used to control the movement of roof strata in Mineng caving area", while overflow technology is used to control the movement of roof overlying strata, further reducing the surface subsidence. Basic men's. The key point of this technology is to design a subcritical and strict rope working face area. Extract the grouting gallery in the mining area. The grouting pipe layout parallel to the road area and serving the working face is concentrated in the cave area. Bore a certain distance into the grouting gallery every day. Go deep into the restricted area. The drilling in the rock is the result of grouting the road. It can be loaded into the caving zone and working face in a straight line and moved forward in combination. As a rock, it forms a covering layer to support the roof, and then controls the movement.
Therefore, the number of compressed roof control quantities.
Rock, so caving zone grouting is a necessary means to study overburden deformation under overburden pressure.
1 The response function of the composite was established.
1 1 The basic principle of the analysis is that the roof collapses after the area is released.
Cracks caused by mining. The hypothesis is a special constitutive model of injection. A composite rock stratum filled with water masses. Crack area and form. After that, ordinary beams are not suitable for the composition of this special composite strata. The beam is special 1. This paper is based on the viewpoints of energy, strain beam and stress, and their internal relations. Assuming damage. Based on the composite rock mass beam as a believer—
A compound. ① beam is formed after D rock, and Pinellia ternata lives in rock-breaking zone; ② The beam is hyperelastic and isotropic, and half of it is released.