CN116432275A - Building protection method for cooperatively controlling ground surface subsidence and building limit deformation - Google Patents
Building protection method for cooperatively controlling ground surface subsidence and building limit deformation Download PDFInfo
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Abstract
The invention provides a building protection method for cooperatively controlling ground subsidence and building limit deformation, which comprises the following steps: analyzing the limit deformation value of the building according to the original mining resistance of the building and the mining damage level of the ground surface; determining a first movement deformation value of the earth surface by combining an original relation equation of the movement deformation of the earth surface and the building; determining goaf filling management compactness and anti-mining capacity of an anti-deformation building according to the first cost curve and the second cost curve, so that the surface movement deformation sum corresponding to the goaf filling management compactness and the anti-mining capacity is the lowest, and the total cost of measures corresponding to the goaf filling management compactness and the anti-mining capacity is greater than or equal to the first movement deformation value; filling and treating the goaf according to two corresponding measures, and carrying out deformation-resistant design and deformation-resistant reinforcement treatment on the ground building. The invention realizes the optimal protection of the building through comprehensive underground goaf filling management, deformation resistance design and deformation resistance reinforcement treatment of the building, and reduces the protection cost of the building under the condition of ensuring that the ground building is not damaged by mining.
Description
Technical Field
The invention relates to the technical field of building protection, in particular to a building protection method for cooperatively controlling ground subsidence and building limit deformation.
Background
The exploitation of coal resources causes large-scale and large-scale mining subsidence areas, which leads to the falling, fracture and bending of overlying rock mass, reduces the mechanical strength of the rock mass and reduces the bearing capacity of building foundations above old goafs.
Under the load action of the building above the goaf, the rock mass of the burst zone which is in a relatively balanced state is possibly reactivated, the rock mass of the burst zone is compacted again, the underground residual cavity is burst again, the ground surface is additionally moved and deformed, and then the newly built building is settled, locally cracked and inclined until collapse. Therefore, there is a need for protecting the comprehensive utilization of the coal mining subsidence area and the building (structure) above the subsidence area.
At present, the common and most effective goaf building protection method is to perform full-space grouting filling on the underground non-caving goaf or residual pore cracks, reduce the residual deformation value of the ground, and further achieve comprehensive utilization of a coal mining subsidence area and protection work of building (construction) above the subsidence area. But the cost of full grouting filling is high.
Another method is that when the residual movement deformation of the ground surface is small, such as the ground surface subsidence is less than 200mm, the horizontal deformation is not more than 4mm/m, the inclination value is not more than 6mm/m and the curvature deformation is not more than 0.6X10 -3 And at the time of/m, directly reinforcing the ground building by adopting a mode of on-site reinforcement of the ground building or anti-mining design of the building. However, the method has limited improvement degree of building strength, cannot be applied to goafs with large residual movement deformation of the earth surface, and has higher and higher cost along with the improvement of the protection level of the building.
Disclosure of Invention
The invention provides a building protection method for cooperatively controlling ground subsidence and building limit deformation, which is used for solving the defect that the effect of ground building protection measures in subsidence areas and the reinforcement treatment cost are difficult to balance in the prior art, and optimizing the protection cost of a building under the condition that the building is not damaged by mining.
The invention provides a building protection method for cooperatively controlling ground subsidence and building limit deformation, which comprises the following steps:
analyzing the limit deformation value of the building according to the original mining resistance of the building and the mining damage level of the ground surface;
determining a first movement deformation value corresponding to a mining damage level of the ground surface according to a pre-acquired original relation equation between the movement deformation value of the building and the movement deformation value of the ground surface and the limit deformation value of the building under different mining damage levels of the ground surface;
determining the filling management compactness of goafs corresponding to different ground surface control deformation levels according to limit deformation values corresponding to the ground surface mining damage levels, drawing a first cost curve of the goafs with different filling management compactness and a second cost curve of the goafs with different deformation resistance designs and corresponding mining resistance under the condition of reinforcing the management levels, and determining the filling management compactness of the goafs and the final mining resistance of the buildings so that the sum of ground surface movement deformation values corresponding to the filling management compactness and the mining resistance of the deformation-resistant buildings is larger than or equal to the first movement deformation value of the ground surface, and the total cost of the filling cost of the goafs and the reinforcing cost of the buildings is the lowest;
and carrying out filling treatment on the goaf according to the determined filling treatment compactness of the goaf, and carrying out deformation resistance design and reinforcement treatment on the building according to the determined final mining resistance of the building.
According to the building protection method for cooperatively controlling the ground subsidence and the limit deformation of the building, the steps of determining the filling management compactness of goaf corresponding to different ground surface control deformation grades according to the limit deformation value corresponding to the ground surface mining damage grade, drawing a first cost curve of the goaf for different filling management compactness and a second cost curve of the building for different deformation resistance designs and corresponding mining resistance under the condition of reinforcing the management grade, and determining the filling management compactness of the goaf and the final mining resistance of the building comprise the following steps:
according to the first cost curve, determining the treatment cost of filling the goaf with each filling treatment compactness, and determining the earth surface movement deformation value corresponding to each filling treatment compactness by using an earth surface subsidence calculation method;
calculating a first difference value between a first movement deformation value of the earth surface and an earth surface movement deformation value corresponding to each filling management compactness;
determining a mobile deformation value of the building according to an original relation equation between the mobile deformation value of the building and the mobile deformation value of the ground surface and the first difference value;
determining the final mining resistance of the building after reinforcement according to the movement deformation value of the building;
determining the reinforcement cost corresponding to the final mining resistance of the building after reinforcement according to the second cost curve;
determining a filling governance cost of the goaf and a total cost of an anti-deformation design and reinforcement governance cost of the building;
and determining the filling management compactness of the goaf corresponding to the minimum value in the total cost and the final mining resistance of the building after reinforcement.
According to the building protection method for cooperatively controlling the ground subsidence and the building limit deformation, which is provided by the invention, after the steps of filling and managing the goaf according to the determined filling and managing compactness of the goaf and carrying out deformation resistance design and reinforcement and management on the building according to the determined final mining resistance of the building, the method further comprises the following steps:
establishing a relation equation between the movement deformation value of the building and the movement deformation value of the ground surface again;
determining a second difference between the coefficients of the original relationship equation and the coefficients of the re-established relationship equation;
determining whether the second difference is greater than a preset threshold.
According to the building protection method for cooperatively controlling the ground subsidence and the building limit deformation, which is provided by the invention, after the steps of filling and managing the goaf according to the determined filling and managing compactness of the goaf and carrying out deformation resistance design and reinforcement and management on the building according to the determined final mining resistance of the building, the method further comprises the following steps:
determining a movement deformation value of the building corresponding to the final mining resistance after the building is reinforced;
establishing a relation equation between the movement deformation value of the building and the movement deformation value of the ground surface again;
determining a second movement deformation value of the ground surface according to the re-established relation equation and the movement deformation value of the building corresponding to the final mining resistance after the building is reinforced;
subtracting the second movement deformation value of the earth surface from the first movement deformation value of the earth surface to obtain the residual movement deformation of the earth surface;
determining filling management compactness corresponding to the residual movement deformation of the earth surface according to the residual movement deformation of the earth surface;
and determining whether the filling management compactness of the goaf is greater than or equal to the filling management compactness corresponding to the residual movement deformation of the ground surface.
According to the building protection method for cooperatively controlling the ground subsidence and the limit deformation of the building, which is provided by the invention, the step of analyzing the limit deformation value of the building according to the original mining resistance and the mining damage level of the ground surface comprises the following steps:
and analyzing the limit deformation value of the building under different surface mining damage levels according to the original mining resistance and the surface mining damage level of the building by using related regulation specifications.
According to the building protection method for cooperatively controlling the ground subsidence and the limit deformation of the building, the limit deformation value of the building comprises one or more of a limit subsidence value, a limit horizontal stretching deformation value, a limit inclination value and a limit curvature deformation value.
According to the building protection method for cooperatively controlling the ground subsidence and the building limit deformation, before the step of determining the first movement deformation value corresponding to the ground surface mining damage level according to the original relation equation between the movement deformation value of the building and the movement deformation value of the ground surface, which are acquired in advance, and the limit deformation value of the building under different ground surface mining damage levels, the building protection method further comprises the following steps:
establishing an original relation equation between the subsidence value of the building and the subsidence value of the earth surface;
establishing an original relation equation between the inclination value of the building and the inclination value of the earth surface;
and establishing an original relation equation between the building horizontal deformation value and the ground surface horizontal deformation value.
According to the building protection method for cooperatively controlling the ground subsidence and the building limit deformation, before the step of determining the first movement deformation value corresponding to the ground surface mining damage level according to the original relation equation between the pre-acquired building movement deformation value and the ground surface movement deformation value and the limit deformation value of the building under different ground surface mining damage levels, the method further comprises the following steps:
calculating the movement deformation value of the earth surface after the overlying coal rock layer of the goaf is stabilized by using a probability integration method according to the geological mining condition of the goaf and the earth surface movement deformation calculation parameter;
monitoring a mobile deformation value of an upper building of the goaf;
and establishing an original relation equation between the building movement deformation value and the ground surface movement deformation value according to the ground surface movement deformation value of the goaf upper part and the movement deformation value of the building.
According to the building protection method for cooperatively controlling the ground subsidence and the limit deformation of the building, which is provided by the invention, the original relation equation is a linear equation.
According to the building protection method for cooperatively controlling the ground subsidence and the building limit deformation, the limit deformation value corresponding to the mining resistance of the building under the mining damage level of the ground is analyzed, the ground movement deformation value corresponding to the limit deformation value is obtained according to the movement deformation relation equation of the building and the ground, the ground movement deformation control value is distributed to the goaf filling and the building reinforcement for processing according to the goaf filling cost curve corresponding to the filling and the compaction degree and the building reinforcement cost curve corresponding to the mining resistance, so that the total cost of the two processing modes is minimum, grouting filling of the goaf and deformation resistance reinforcement of the ground building are comprehensively used, building protection measures with the lowest cost are selected under the condition that the ground building is not affected by mining damage, and the protection cost of the building is reduced.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for protecting a building by cooperatively controlling surface subsidence and limit deformation of the building.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The method for protecting a building according to the present invention, in which the ground subsidence and the limit deformation of the building are cooperatively controlled, is described with reference to fig. 1, comprising:
the higher the mining resistance of the building, the less likely deformation damage is caused by the deformation of the ground surface.
Alternatively, the primary mining resistance of a building is classified as resistant to class I deformation, resistant to class II deformation, resistant to class III deformation, and resistant to class IV deformation. The original mining resistance of a building is related to the material, structure, construction time, type of the building, the foundation treatment measures adopted and the like.
The surface is damaged by mining, namely, the underground coal mining damages the surface, and the higher the surface mining damage level is, the higher the deformation degree of the surface is.
Determining the mining damage level of the ground surface where the building is located according to a coal mining program below the building, and combining the original mining resistance of the building to obtain the corresponding limit deformation value of the building under the condition of different ground surface damage levels.
The limit deformation value of a building is the maximum deformation value of the building which can resist a certain surface mining damage level. When the deformation amount of the building is larger than the limit deformation value of the building, the deformation damage of the corresponding surface by the mining damage level occurs to the building.
102, determining a first movement deformation value corresponding to a mining damage level of the ground surface according to a pre-acquired original relation equation between the movement deformation value of the building and the movement deformation value of the ground surface and the limit deformation value of the building under different mining damage levels of the ground surface;
the movement deformation value of the ground surface is different from the movement deformation value of the building to a certain extent.
The method comprises the steps of monitoring the movement deformation of a building and the movement deformation of the earth surface in the mining area or the area with similar mining damage level, respectively obtaining the movement deformation value of the building and the movement deformation value of the earth surface, calculating to obtain the mathematical relationship between the movement deformation value of the earth surface and the movement deformation value of the building, and establishing an original relationship equation.
And after obtaining the limit deformation values of the building under different ground surface mining damage levels, substituting the limit deformation values into the original relation equation, and calculating to obtain the ground surface deformation values corresponding to the limit deformation values of the building under different ground surface mining damage levels, namely the first movement deformation values of the ground surface.
the filling and controlling compactness of the goaf is the filling quantity of the goaf. The ground surface control deformation grades of the goaf are divided according to the requirements, the ground surface control deformation grades are different, and the filling treatment compactness of the goaf is different.
The first cost curve is a goaf filling management compactness-cost curve of the earth surface, and the goaf filling management compactness of the earth surface and the corresponding filling cost are different due to different earth surface control deformation levels after filling, and the movement deformation values for eliminating the earth surface after filling are also different.
The abscissa of the first cost curve is the filling management compactness of the goaf, the range is 0 to 100%, and the ordinate is the construction cost of each filling management compactness in unit area.
The second cost curve is a mining resistance-cost curve of the upper building of the goaf, the mining resistance of the building is different, the corresponding deformation resistance design, reinforcement measures and the cost are different, namely, the building is different in deformation resistance design and reinforcement treatment level, and the ground surface movement deformation value which can be resisted after the building is reinforced is also different.
The abscissa of the second cost curve is the anti-mining ability of the building, the building resists compression and does not stretch, the anti-mining ability of the conventional building is based on horizontal deformation, and the anti-mining ability of the high-rise building is based on inclined deformation. The ordinate is the construction cost per building area for the building to have the corresponding mining resistance and to employ conventional deformation control measures. Conventional deformation control measures include planning, construction, foundation treatment, and the like.
And respectively selecting different goaf filling management compactness and building anti-mining capacity, so that the sum of the movement deformation value of the ground surface after filling corresponding to each goaf filling management compactness and building anti-mining capacity and the movement deformation value of the ground surface which can be resisted after deformation resistance treatment and reinforcement of the building is greater than or equal to the first movement deformation value of the ground surface.
Namely, by grouting the goaf and carrying out deformation resistance design and reinforcement treatment on the building, the limit deformation value of the mining damage level of the corresponding surface of the building is improved, and the building cannot be deformed and damaged.
And calculating the sum of the filling and treating compactness of each group of goaf and the cost corresponding to the mining resistance of the building, namely, the total cost of the building protection measures, and selecting the building protection measures which are controllable in technology, simple to operate and correspond to the goaf filling and treating compactness and the mining resistance of the building and correspond to the minimum total cost.
And 104, performing filling treatment on the goaf according to the determined filling treatment compactness of the goaf, and performing deformation resistance design and reinforcement treatment on the building according to the determined final mining resistance of the building.
Grouting filling treatment is carried out on the goaf at the lower part until the filling treatment compactness of the goaf reaches the predetermined filling treatment compactness.
And selecting corresponding building anti-deformation design and reinforcement measures according to the preset building anti-mining capacity, and reinforcing and treating the building to improve the anti-mining capacity of the building.
Optionally, when building protection measures are selected, the processing difficulty and the engineering quantity of the building protection are considered, and processing measures which accord with the value engineering optimization principle, have controllable cost of the anti-mining measures of the building and are simple and feasible are selected, so that the requirements of engineering construction and ground building deformation protection are met.
According to the invention, the limit deformation value corresponding to the mining resistance of the building under the mining damage level of the ground surface is analyzed, the ground surface movement deformation value corresponding to the limit deformation value is obtained according to the movement deformation relation equation of the building and the ground surface, the ground surface movement deformation control value is distributed to the goaf filling and building reinforcement for processing according to the goaf filling cost curve corresponding to the compaction degree of different filling treatments and the building reinforcement cost curve corresponding to the mining resistance of the building, so that the total cost of the two processing modes is minimum, the grouting filling of the goaf at the lower part and the deformation resistance reinforcement protection measures of the ground surface building are comprehensively used, and the building protection measures with the lowest cost are selected under the condition that the ground surface building is not influenced by mining damage, thereby reducing the protection cost of the building.
In the building protection method for cooperatively controlling the ground subsidence and the limit deformation of a building, according to the limit deformation value corresponding to the mining damage level of the ground, the filling management compactness of goafs corresponding to different ground control deformation levels is determined, and a first cost curve of the goafs with different filling management compactness and a second cost curve of the building with different deformation resistance designs and corresponding mining resistance under the condition of reinforcing the management levels are drawn, the steps of determining the filling management compactness of the goafs and the final mining resistance of the building comprise:
according to the first cost curve, determining the treatment cost of filling the goaf with each filling treatment compactness, and determining the earth surface movement deformation value corresponding to each filling treatment compactness by using an earth surface subsidence calculation method;
and substituting the filling management compactness into a first cost curve to calculate the corresponding filling cost, and grouting and filling the goaf to the filling management compactness to enable the goaf to reach the corresponding surface control deformation level.
Alternatively, the filling governance compactness is obtained by calculating the equivalent goaf residual space volume of the goaf required grouting governance (or pillar governance) in the underground goaf and calculating the occupancy ratio of the equivalent goaf residual space volume to the goaf filling governance volume at the limit of the damage of the surface building (construction).
And calculating the earth surface movement deformation value corresponding to the filling management compactness according to the filling management compactness of the goaf through an earth surface subsidence calculation formula.
Calculating a first difference value between the first movement deformation value of the earth surface and the earth surface movement deformation value corresponding to each filling management compactness;
the first movement deformation value is subtracted by the earth surface movement deformation value corresponding to each filling management compactness, namely a first difference value.
And (3) filling the ground goaf with a certain filling management compactness, then achieving the ground control level corresponding to the filling management compactness, and eliminating part of the first movement deformation value of the ground.
The first difference value represents a first movement deformation value of a part of the ground surface which needs to be eliminated after the ground surface goaf is filled.
Determining a mobile deformation value of the building according to an original relation equation between the mobile deformation value of the building and the mobile deformation value of the ground surface and the first difference value;
and substituting the first difference value into the original relation equation to calculate a movement deformation value of the building, so that the residual earth surface movement deformation value to be resisted is converted into a mining-resistant deformation value of the building, and the mining-resistant deformation value is counteracted by strengthening the deformation resistance of the building.
Determining the final mining resistance of the building after reinforcement according to the movement deformation value of the building;
in order to eliminate the mobile deformation value of the building, the building is reinforced, so that the final mining resistance of the building is improved.
And determining the final mining resistance of the building after reinforcement according to the movement deformation value of the building according to the related regulation specifications.
Determining the reinforcement cost corresponding to the final mining resistance of the building after reinforcement according to the second cost curve;
substituting the value corresponding to the final anti-mining ability after building reinforcement into a second cost curve, and calculating to obtain the reinforcement cost corresponding to the final anti-mining ability after building reinforcement.
Determining a filling governance cost of the goaf and a total cost of an anti-deformation design and reinforcement governance cost of the building;
the total cost is obtained by adding the filling treatment cost of the goaf and the deformation resistance design and reinforcement treatment cost of the building.
And determining the filling management compactness of the goaf corresponding to the minimum value in the total cost and the final mining resistance of the building after reinforcement.
And determining the filling management compactness of the goaf corresponding to the minimum total cost and the final mining resistance after building reinforcement, thereby determining the volume of underground grouting filling of the goaf and the reinforcement measure for the surface building.
In the building protection method for cooperatively controlling the ground surface subsidence and the building limit deformation, the steps of filling and managing the goaf according to the determined filling and managing compactness of the goaf and performing deformation resistance design and reinforcement and management on the building according to the determined final mining resistance of the building are further included:
establishing a relation equation between the movement deformation value of the building and the movement deformation value of the ground surface again;
after goaf grouting filling and building reinforcement, the movement deformation of the earth surface is not easy to be transmitted to the building, namely, the coefficient of the relation equation can be changed. The invention verifies the effect of the invention on building protection by verifying the coefficient change of the relation equation before and after building protection measures are implemented.
And (3) carrying out mobile deformation monitoring again on the goaf after grouting filling and the reinforced building, and calculating to obtain a new relation equation between the mobile deformation value of the building and the mobile deformation value of the ground surface.
Determining a second difference between the coefficients of the original relationship equation and the coefficients of the re-established relationship equation;
subtracting corresponding coefficients in the re-established relation equation from the coefficients in the original equation to obtain a second difference value.
Determining whether the second difference is greater than a preset threshold.
The preset threshold is determined empirically. If the second difference value is larger than the preset threshold value, the implementation of the building protection measures is determined to have a better protection effect on the building.
In the building protection method for cooperatively controlling the ground surface subsidence and the building limit deformation, the steps of filling and managing the goaf according to the determined filling and managing compactness of the goaf and performing deformation resistance design and reinforcement and management on the building according to the determined final mining resistance of the building are further included:
determining a movement deformation value of the building corresponding to the final mining resistance after the building is reinforced;
and calculating the movement deformation value of the building corresponding to the final mining resistance after building reinforcement according to related regulations, thereby determining the ground surface movement deformation value for eliminating the mining resistance of the building.
Establishing a relation equation between the movement deformation value of the building and the movement deformation value of the ground surface again;
and monitoring the mobile deformation value of the reinforced building and the mobile deformation value of the ground goaf after filling, and establishing a relation equation between the mobile deformation value of the reinforced building and the mobile deformation value of the ground surface.
Determining a second movement deformation value of the ground surface according to the re-established relation equation and the movement deformation value of the building corresponding to the final mining resistance after the building is reinforced;
substituting the building movement deformation value into the re-established relation equation to obtain a second movement deformation value of the earth surface, namely the earth surface movement deformation value with the mining resistance of the building eliminated, and the second movement deformation value is also the ground movement deformation value which can be resisted by the reinforced building.
Subtracting the second movement deformation value of the earth surface from the first movement deformation value of the earth surface to obtain the residual movement deformation of the earth surface;
the residual movement deformation of the ground surface is the movement deformation of the ground surface which needs to be overcome by filling the mining grouting.
Determining filling management compactness corresponding to the residual movement deformation of the earth surface according to the residual movement deformation of the earth surface;
and calculating the filling management compactness corresponding to the residual movement deformation of the earth surface by using an earth surface subsidence calculation formula.
And determining whether the filling management compactness of the goaf is greater than or equal to the filling management compactness corresponding to the residual movement deformation of the ground surface.
If the filling management compactness of the goaf is greater than or equal to the filling management compactness corresponding to the residual movement deformation of the ground surface, the fact that the ground surface movement deformation which causes the limit deformation of the building is completely eliminated after grouting filling of the goaf and building reinforcement is carried out is indicated, and the building is not affected under the mining damage level of the corresponding ground surface, so that the building is effectively protected.
In the building protection method for cooperatively controlling the subsidence of the ground surface and the limit deformation of the building, the step of analyzing the limit deformation value of the building according to the original mining resistance and the mining damage level of the ground surface of the building comprises the following steps:
and analyzing the limit deformation value of the building under different surface mining damage levels according to the original mining resistance and the surface mining damage level of the building by using related regulation specifications.
Optionally, the relevant specifications are "building, water, railway and main roadway coal pillar set-up and pressed coal mining specifications".
And analyzing the corresponding limit deformation of the building under different mining damage levels of the surface by combining the related specifications.
In the building protection method for cooperatively controlling the ground subsidence and the limit deformation of the building, the limit deformation value of the building comprises one or more of a limit subsidence value, a limit horizontal stretching deformation value, a limit inclination value and a limit curvature deformation value.
The limit deformation condition of the building, which is affected by the surface deformation, is represented by one or more of a limit dip value, a limit horizontal stretch deformation value, a limit tilt value, and a mechanical curvature deformation value of the building.
Taking monitoring data of a mining area as an example, the horizontal tensile deformation of the ground surface reaches 0.61mm/m, the horizontal compressive deformation reaches-1.33 mm/m, and mining cracks will appear in a weak part of a house wall in a mining influence area, so that I-level mining damage is caused to the house; when the ground surface subsidence value exceeds 200mm, the long-term use safety of the building brick body is affected under the influence of the ground water; a surface tilt value of 1.1mm/m will also have a class I damaging effect on the bricks or brickwork of the masonry.
In the building protection method for cooperatively controlling the subsidence of the earth surface and the limit deformation of the building, before the step of determining the first movement deformation value corresponding to the mining damage level of the earth surface according to the original relation equation between the movement deformation value of the building and the movement deformation value of the earth surface, which are acquired in advance, and the limit deformation value of the building under different mining damage levels, the method further comprises the following steps:
establishing an original relation equation between the subsidence value of the building and the subsidence value of the earth surface;
taking monitoring data of a certain mining area as an example, establishing a relational equation of a ground surface movement deformation value and a movement deformation value of a building based on test results and referring to domestic and foreign measured data. Wherein, the ground surface movement deformation value and the movement deformation value of the building comprise a sinking value, an inclination value and a horizontal deformation value of the ground surface.
The foundation soil at the lower part of the building foundation is generally treated according to a certain process. But under the action of dead weight, the building sinks to W Building construction With the surface dip value W Ground (floor) Very close, nearly equal. The corresponding relation equation is: w (W) Building construction ＝(0.95～0.98)×W Ground (floor) 。
Establishing an original relation equation between the inclination value of the building and the inclination value of the earth surface;
for the foundation soil treated by the general working procedure, the foundation of the superstructure is inclined by T Building construction Inclination T with the earth's surface Ground (floor) The difference is small, and the corresponding relation equation is: t (T) Building construction ＝0.833T Ground (floor) +0.28。
And establishing an original relation equation between the horizontal stretching deformation value of the building and the horizontal stretching deformation value of the ground surface.
Based on the actual measurement data, and combining the horizontal deformation epsilon of the foundation of the partial mining area building Building construction Horizontal deformation epsilon from the earth's surface Ground (floor) The relation actual measurement data is used for obtaining a corresponding relation equation: epsilon Building construction ＝0.94ε Ground (floor) -0.12。
Taking the actual measurement data of a certain mining area as an example on the basis, after adopting simple and easy deformation-resistant treatment measures with easy control of cost for a ground building, re-establishing a relation equation between the moving deformation value of the building and the moving deformation value of the ground surface, for example:
the equation of relation between building and subsurface subsidence is: w (W) Building construction ＝0.95×W Ground (floor) 。
The relation equation between the building and the ground inclination value is: t (T) Building construction ＝0.66T Ground (floor) +0.30。
The equation of relation between the building and the horizontal deformation of the earth's surface is: epsilon Building construction ＝0.17ε Ground (floor) -0.10。
Wherein the second difference is the difference between the same coefficients of the same relational equation. For example, for the equation of relation between building and surface inclination values, the second difference is the difference between 0.833 and 0.66.
In the building protection method for cooperatively controlling the subsidence of the earth surface and the limit deformation of the building, before the step of determining the first movement deformation value corresponding to the mining damage level of the earth surface according to the original relation equation between the movement deformation value of the building and the movement deformation value of the earth surface, which are acquired in advance, and the limit deformation value of the building under different mining damage levels, the method further comprises the following steps:
calculating the movement deformation value of the earth surface after the overlying coal rock layer of the goaf is stabilized by using a probability integration method according to the geological mining condition of the goaf and the earth surface movement deformation calculation parameter;
and collecting geological mining conditions of the region to be treated of the underground goaf, wherein the geological mining conditions comprise optionally the thickness of a coal bed, the property of rock and soil, the burial depth of the coal bed, the dip angle and the like.
The calculated movement deformation value of the ground surface after the overlying coal rock layer of the goaf is stabilized mainly comprises a ground surface subsidence value, an inclination value, a horizontal deformation value and a curvature deformation value.
Monitoring a mobile deformation value of an upper building of the goaf;
the movement deformation values of the building mainly comprise a building subsidence value, an inclination value, a horizontal deformation value and a curvature deformation value.
And establishing an original relation equation between the moving deformation value of the building and the moving deformation value of the ground surface according to the moving deformation value of the ground surface at the upper part of the goaf and the moving deformation value of the building.
The movement deformation value of the ground surface of the upper part of the goaf is specifically the movement deformation value of the ground surface of the subsidence area of the upper part of the goaf.
The original relation equation includes a relation equation between a subsidence value of the earth surface and a subsidence value of the building, a relation equation between an inclination value of the earth surface and an inclination value of the building, a relation equation between a horizontal deformation value of the earth surface and a horizontal deformation value of the building, and a relation equation between a curvature deformation value of the earth surface and a curvature deformation value of the building.
In the building protection method for cooperatively controlling the ground surface subsidence and the limit deformation of the building, the original relation equation is a linear equation.
The linear equation can calculate the mathematical relationship between the moving deformation value of the building and the moving deformation value of the earth surface more simply and intuitively, and is convenient for conversion between the moving deformation value of the building and the moving deformation value of the earth surface.
On the basis, two modes of grouting filling and building reinforcement can be associated by calculating ground movement deformation values corresponding to different filling and treatment compactness of the goaf, the influence degree of different modes on building protection is intuitively calculated, cooperative control of building protection is realized, and the total cost of building protection is optimized.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A method of building protection for cooperative control of surface subsidence and building limit deformation, comprising:
analyzing the limit deformation value of the building according to the original mining resistance of the building and the mining damage level of the ground surface;
determining a first movement deformation value corresponding to a mining damage level of the ground surface according to a pre-acquired original relation equation between the movement deformation value of the building and the movement deformation value of the ground surface and the limit deformation value of the building under different mining damage levels of the ground surface;
determining the filling management compactness of goafs corresponding to different ground surface control deformation levels according to limit deformation values corresponding to the ground surface mining damage levels, drawing a first cost curve of the goafs with different filling management compactness and a second cost curve of the goafs with different deformation resistance designs and corresponding mining resistance under the condition of reinforcing the management levels, and determining the filling management compactness of the goafs and the final mining resistance of the buildings so that the sum of ground surface movement deformation values corresponding to the filling management compactness and the mining resistance of the deformation-resistant buildings is larger than or equal to the first movement deformation value of the ground surface, and the total cost of the filling cost of the goafs and the reinforcing cost of the buildings is the lowest;
and carrying out filling treatment on the goaf according to the determined filling treatment compactness of the goaf, and carrying out deformation resistance design and reinforcement treatment on the building according to the determined final mining resistance of the building.
2. The method for protecting a building by cooperatively controlling ground subsidence and limit deformation of the building according to claim 1, wherein the steps of determining the filling governance compactness of goaf corresponding to different ground surface control deformation levels according to the limit deformation value corresponding to the ground surface mining damage level, drawing a first cost curve of different filling governance compactness of the goaf and a second cost curve of corresponding mining resistance under different deformation resistance design and reinforcement governance level conditions of the building, and determining the filling governance compactness of the goaf and the final mining resistance of the building comprise:
according to the first cost curve, determining the treatment cost of filling the goaf with each filling treatment compactness, and determining the earth surface movement deformation value corresponding to each filling treatment compactness by using an earth surface subsidence calculation method;
calculating a first difference value between a first movement deformation value of the earth surface and an earth surface movement deformation value corresponding to each filling management compactness;
determining a mobile deformation value of the building according to an original relation equation between the mobile deformation value of the building and the mobile deformation value of the ground surface and the first difference value;
determining the final mining resistance of the building after reinforcement according to the movement deformation value of the building;
determining the reinforcement cost corresponding to the final mining resistance of the building after reinforcement according to the second cost curve;
determining a filling governance cost of the goaf and a total cost of an anti-deformation design and reinforcement governance cost of the building;
and determining the filling management compactness of the goaf corresponding to the minimum value in the total cost and the final mining resistance of the building after reinforcement.
3. The method of protecting a building by cooperative control of surface subsidence and building limit deformation according to claim 1, wherein after the step of filling the goaf according to the determined filling governance compactness of the goaf, performing deformation resistance design and reinforcement governance on the building according to the determined final mining resistance of the building, further comprising:
establishing a relation equation between the movement deformation value of the building and the movement deformation value of the ground surface again;
determining a second difference between the coefficients of the original relationship equation and the coefficients of the re-established relationship equation;
determining whether the second difference is greater than a preset threshold.
4. The method of protecting a building by cooperative control of surface subsidence and building limit deformation according to claim 1, wherein after the step of filling the goaf according to the determined filling governance compactness of the goaf, performing deformation resistance design and reinforcement governance on the building according to the determined final mining resistance of the building, further comprising:
determining a movement deformation value of the building corresponding to the final mining resistance after the building is reinforced;
establishing a relation equation between the movement deformation value of the building and the movement deformation value of the ground surface again;
determining a second movement deformation value of the ground surface according to the re-established relation equation and the movement deformation value of the building corresponding to the final mining resistance after the building is reinforced;
subtracting the second movement deformation value of the earth surface from the first movement deformation value of the earth surface to obtain the residual movement deformation of the earth surface;
determining filling management compactness corresponding to the residual movement deformation of the earth surface according to the residual movement deformation of the earth surface;
and determining whether the filling management compactness of the goaf is greater than or equal to the filling management compactness corresponding to the residual movement deformation of the ground surface.
5. The method for protecting a building according to any one of claims 1 to 4, wherein the step of analyzing the limit deformation value of the building according to the original mining resistance and the mining damage level of the ground surface comprises:
and analyzing the limit deformation value of the building under different surface mining damage levels according to the original mining resistance and the surface mining damage level of the building by using related regulation specifications.
6. The method of claim 1-4, wherein the limit deformation values of the building include one or more of a limit dip value, a limit horizontal deformation value, a limit inclination value, and a limit curvature deformation value.
7. The method of claim 6, wherein prior to the step of determining the first mobile deformation value corresponding to the surface mining damage level based on the original equation of relation between the mobile deformation value of the building and the mobile deformation value of the surface obtained in advance and the limit deformation value of the building at different surface mining damage levels, further comprising:
establishing an original relation equation between the subsidence value of the building and the subsidence value of the earth surface;
establishing an original relation equation between the inclination value of the building and the inclination value of the earth surface;
and establishing an original relation equation between the building horizontal deformation value and the ground surface horizontal deformation value.
8. The method of claim 1-4, wherein prior to the step of determining the first mobile deformation value corresponding to the surface mining damage level based on the equation of the original relationship between the pre-acquired building mobile deformation value and the surface mobile deformation value and the limiting deformation value of the building at different surface mining damage levels, further comprising:
calculating the movement deformation value of the earth surface after the overlying coal rock layer of the goaf is stabilized by using a probability integration method according to the geological mining condition of the goaf and the earth surface movement deformation calculation parameter;
monitoring a mobile deformation value of an upper building of the goaf;
and establishing an original relation equation between the building movement deformation value and the ground surface movement deformation value according to the ground surface movement deformation value of the goaf upper part and the movement deformation value of the building.
9. The method of building protection with cooperative control of surface subsidence and building limit deformation according to any one of claims 1 to 4, wherein the raw relational equation is a linear equation.
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