CN107526920B - Method for analyzing corresponding relation between new surface subsidence dynamic process and overlying strata abscission layer development - Google Patents
Method for analyzing corresponding relation between new surface subsidence dynamic process and overlying strata abscission layer development Download PDFInfo
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Abstract
The invention discloses a method for analyzing the corresponding relation between a new surface subsidence dynamic process and overburden abscission layer development, which comprises the steps of measuring a sticking measuring point on a model overburden section to obtain the time process of abscission layer from cracking to expanding to closing and quantitative development indexes of the length and the width of the abscission layer; arranging a subsidence measuring point on the model ground surface, and measuring the whole process data of the ground surface subsidence gradually developing from zero to the maximum value at the same time with the separation layer; and obtaining a time schedule by a model test, displaying the dynamic growth data of the surface subsidence and the dynamic development data of the overburden bed separation, statistically analyzing the corresponding relation of the dynamic growth data and the dynamic development data of the overburden bed separation, finding the corresponding relation of the initial period, the active period and the decline period of the surface subsidence and the initiation, development and closing time points of the bed separation, and newly proposing and dividing bed separation time nodes and each development stage. The characteristic of breaking the overburden separation layer can be more clearly reflected by indirectly obtaining data when the physical model and the digital model are used.
Description
Technical Field
The invention relates to the technical field of surface subsidence dynamic processes and overburden abscission layers, in particular to a method for analyzing a corresponding relation between a new surface subsidence dynamic process and overburden abscission layer development.
Background
In the process of underground mining of the coal mine, the spontaneous combustion stress balance state of the overlying strata is destroyed along with the pushing of the underground mining working face, and the stress in the overlying strata of the goaf is redistributed under the action of the redistributed secondary stress field so as to achieve new balance. The overburden rock is broken, caving, bending and sinking, the movement change gradually develops from bottom to top to the ground surface to form ground surface subsidence, and the movement of the overburden rock is not completely synchronous and consistent due to different lithology, distance from a goaf position, thickness and the like, so that the displacement difference of overburden rock movement in the vertical direction occurs, and a separation space is formed.
The production conditions of the overburden separation layer are as follows: the delamination of rock stratum means that normal displacement is generated between two adjacent rock strata, the generation condition of the delamination mainly depends on the bending rigidity of the upper rock stratum and the lower rock stratum, when the bending rigidity of the upper rock stratum is larger than that of the lower rock stratum, the delamination is generated, and the bending rigidity of the rock stratum depends on the elastic modulus and the thickness of the rock stratum.
Disclosure of Invention
The invention aims to provide a method for analyzing the corresponding relation between a new surface subsidence dynamic process and overburden separation layer development.
In order to achieve the purpose, the invention provides the following technical scheme: measuring a sticking measuring point on a model overburden section to obtain a time process from cracking to expanding to closing of a separation layer and quantitative development indexes of the length and the width of the separation layer;
arranging a subsidence measuring point on the model ground surface, and measuring the whole process data of the ground surface subsidence gradually developing from zero to the maximum value at the same time with the separation layer;
and obtaining a time schedule by a model test, displaying the dynamic growth data of the surface subsidence and the dynamic development data of the overburden bed separation, statistically analyzing the corresponding relation of the dynamic growth data and the dynamic development data of the overburden bed separation, finding the corresponding relation of the initial period, the active period and the decline period of the surface subsidence and the initiation, development and closing time points of the bed separation, and newly proposing and dividing bed separation time nodes and each development stage.
The analysis method for the corresponding relation between the new surface subsidence dynamic process and the overburden abscission layer development is characterized in that the analysis is carried out by measuring a model overburden profile pasting measuring point, when the mining depth of a main overburden key layer on a working surface is 30-40m, the surface subsidence speed is the fastest, the subsidence speed reaches 7.5mm/d, therefore, the maximum subsidence speed of the surface is synchronous with the maximum subsidence speed of the key layer, the rapid subsidence of the surface is caused by the primary breakage of the key layer,
the calculation formula is as follows:
dW(t)/dt＝c[W(t)/(1-1-e-ct)-Wk(1-1-e-ct)]
w (t) is a dynamic convergence value at a certain time
WkAs the final subsidence of the earth's surface
1-e-ctTo obtain the variation in a certain time
dW (t)/dt is the ground surface sinking speed, when W (t)/(1-1-e)-ct)-Wk(1-1-e-ct) When the value is greater than 0, the sinking speed of the time table is increased, and when W: (t)/(1-1-e-ct)-Wk(1-1-e-ct) The table descent speed decreases when the value is less than 0, but the resulting value deviates from the actual value to some extent due to the condition of the slant length and the length in the model.
Preferably, the analysis method for the corresponding relation between the new surface subsidence dynamic process and the overburden bed separation development simulates the movement of the key layer rock mass before breaking by setting the parameters of the joints among the key layer blocks to be large so that the blocks do not move, when the mining width reaches the breaking distance of the key layer, the parameters of the joints of the blocks are reduced, the movement of the key layer after breaking is simulated, the breaking of the overburden rock key layer influences the dynamic process of the surface subsidence,
the calculation formula is as follows:
W(t)＝W0+Δω(1-ae-kt)
w (t) is a dynamic convergence value at a certain time
W0Is the maximum subsidence of the earth's surface at the end of the decline period
ΔωIs the residual subsidence value of the earth surface after the end of the decay period
Due to W0The amount of W (t) sinking is related to a, k and t when 1-ae is a fixed value-ktWhen the value is more than 0, the value of W (t) is increased, and when the value is 1-ae-ktWhen the value is less than 0, the W (t) sinking value is reduced, and the breaking of the key layer of the overburden rock causes the obvious increase of the surface sinking speed and does not change periodically.
Preferably, the analysis method for the corresponding relation between the new surface subsidence dynamic process and the overburden bed separation development is used for simulating excavation in a coal bed according to irregular depths, starting next excavation after model operation is stable after each excavation, when the depth is advanced to 150m, a primary breaking, a first period breaking and a second period breaking occur on a key layer respectively, the surface subsidence increment is smaller before the key layer is broken, the surface subsidence increment is increased after the key layer is broken, and a surface movement influence angle and a movement influence boundary are not constant,
the calculation formula is as follows:
W(x，y，t)＝Wm(1-x2/a2-y2/b2)(1-e-ct)k
w (x, y, t) is the amount of sinking of any point of the sunken basin at any time
1-e-ctTo obtain the variation in a certain time
(1-x2/a2-y2/b2)(1-e-ct)kWhen the product is positive, the amount of W (x, y, t) sinking increases, (1-x)2/a2-y2/b2)(1-e-ct)kWhen the product is negative, the subsidence of W (x, y, t) is reduced, and the influence boundary of the surface subsidence is obviously enlarged along with the increase of a and b.
Compared with the prior art, the invention has the beneficial effects that: the method is characterized in that reasonable subsidence reduction mining technology and parameters are determined according to the characteristics of the overlying strata structure and the key layer under specific conditions.
Drawings
FIG. 1 is a schematic view of a broken-line structure of sinking speed and ground distance according to a new method for analyzing the corresponding relationship between the dynamic process of surface sinking and the development of overburden separation;
FIG. 2 is a table diagram of rock mechanical parameters of a new surface subsidence dynamic process and overburden separation development corresponding relation analysis method of the present invention;
fig. 3 is a table diagram illustrating the influence angle between mining width and surface movement in the method for analyzing the correspondence between the new surface subsidence dynamic process and overburden separation development according to the present invention.
Detailed Description
The invention provides a technical scheme that: measuring a sticking measuring point on a model overburden section to obtain a time process from cracking to expanding to closing of a separation layer and quantitative development indexes of the length and the width of the separation layer;
arranging a subsidence measuring point on the model ground surface, and measuring the whole process data of the ground surface subsidence gradually developing from zero to the maximum value at the same time with the separation layer;
and obtaining a time schedule by a model test, displaying the dynamic growth data of the surface subsidence and the dynamic development data of the overburden bed separation, statistically analyzing the corresponding relation of the dynamic growth data and the dynamic development data of the overburden bed separation, finding the corresponding relation of the initial period, the active period and the decline period of the surface subsidence and the initiation, development and closing time points of the bed separation, and newly proposing and dividing bed separation time nodes and each development stage.
A new surface subsidence dynamic process and overburden absciss layer development corresponding relation analysis method is characterized in that measurement of a model overburden profile pasting measuring point is used for analysis, when the mining depth of a main overburden key layer on a working surface is 30-40m, the surface subsidence speed is the fastest, the subsidence speed reaches 7.5mm/d, therefore, the maximum subsidence speed of the surface is synchronous with the maximum subsidence speed of the key layer, the initial breakage of the key layer leads to the rapid subsidence of the surface,
the calculation formula is as follows:
dW(t)/dt＝c[W(t)/(1-1-e-ct)-Wk(1-1-e-ct)]
w (t) is a dynamic convergence value at a certain time
WkAs the final subsidence of the earth's surface
1-e-ctTo obtain the variation in a certain time
dW (t)/dt is the ground surface sinking speed, when W (t)/(1-1-e)-ct)-Wk(1-1-e-ct) When the value is larger than 0, the sinking speed of the time table is increased, and when W (t)/(1-1-e)-ct)-Wk(1-1-e-ct) The table descent speed decreases when the value is less than 0, but the resulting value deviates from the actual value to some extent due to the condition of the slant length and the length in the model.
A method for analyzing the relation between the dynamic sinking process of earth surface and the development of overlying strata separation layer includes such steps as setting the joint parameters between blocks in key layer to be very big for preventing the blocks from moving, simulating the movement before breaking the key layer, decreasing the joint parameters when the mining width reaches the breaking distance of key layer, simulating the movement after breaking the key layer, and breaking the key layer to influence the dynamic process of earth surface,
the calculation formula is as follows:
W(t)＝W0+Δω(1-ae-kt)
w (t) is a dynamic convergence value at a certain time
W0Is the maximum subsidence of the earth's surface at the end of the decline period
ΔωIs the residual subsidence value of the earth surface after the end of the decay period
Due to W0The amount of W (t) sinking is related to a, k and t when 1-ae is a fixed value-ktWhen the value is more than 0, the value of W (t) is increased, and when the value is 1-ae-ktWhen the value is less than 0, the W (t) sinking value is reduced, and the breaking of the key layer of the overburden rock causes the obvious increase of the surface sinking speed and does not change periodically.
A new surface subsidence dynamic process and overlying strata abscission layer development corresponding relation analysis method is characterized in that excavation is carried out in a simulated coal bed according to irregular depths, model operation is carried out to be stable after each excavation, then next excavation is carried out, when the depth is advanced to 150m, a key layer is subjected to primary breakage, primary period breakage and secondary period breakage respectively, the surface subsidence increment is smaller before the key layer is broken, the surface subsidence increment is increased after the key layer is broken, and the surface movement influence angle and the movement influence boundary are not constant,
the calculation formula is as follows:
W(x，y，t)＝Wm(1-x2/a2-y2/b2)(1-e-ct)k
w (x, y, t) is the amount of sinking of any point of the sunken basin at any time
1-e-ctTo obtain the variation in a certain time
(1-x2/a2-y2/b2)(1-e-ct)kWhen the product is positive, the amount of W (x, y, t) sinking increases, (1-x)2/a2-y2/b2)(1-e-ct)kWhen the product is negative, the amount of W (x, y, t) subsidence is reduced, and as a and b are increased, the influence boundary of the surface subsidence is increasedIs obviously enlarged.
On a similar simulation test model, obtaining the time process of the separation layer from cracking, expanding to closing and the quantitative development index of the length and width of the separation layer through the measurement of a model overlying rock section sticking measuring point; meanwhile, a subsidence measuring point is arranged on the model ground surface, and the whole process data of the ground surface subsidence gradually developing from zero to the maximum value is measured at the same time with the separation layer. Displaying dynamic growth data of surface subsidence and dynamic development data of overburden strata according to a time schedule, carrying out statistical analysis on the corresponding relation between the dynamic growth data and the dynamic development data of overburden strata, finding out the corresponding relation between the initial period, the active period and the decline period of the surface subsidence and the initiation, development and closing time points of the strata, carrying out statistics on the contribution rate of the strata in each period to the surface subsidence, and newly proposing and dividing stratum separation time nodes and each development stage; and converting the corresponding relation between the ground surface subsidence on the spot and the development of the overburden bed separation according to the experimental similarity criterion, and giving the optimal time standard for controlling the ground surface subsidence by the overburden bed separation grouting.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A method for analyzing the corresponding relation between a new surface subsidence dynamic process and overburden separation layer development is characterized by comprising the following steps:
measuring a sticking measuring point on a model overburden section to obtain a time process from cracking to expanding to closing of a separation layer and quantitative development indexes of the length and the width of the separation layer;
arranging a subsidence measuring point on the model ground surface, and measuring the whole process data of the ground surface subsidence gradually developing from zero to the maximum value at the same time with the separation layer;
obtaining a time schedule by a model test, displaying the dynamic growth data of the surface subsidence and the dynamic development data of the overburden bed separation, statistically analyzing the corresponding relation of the two, finding the corresponding relation of the initial period, the active period and the decline period of the surface subsidence and the initiation, development and closing time points of the bed separation, and re-proposing and dividing bed separation time nodes and each development stage;
analyzing by measuring the model overburden profile pasting measuring point, when the mining depth of the main overburden key layer on the working surface is 30-40m, the ground surface sinking speed is the fastest, the sinking speed reaches 7.5mm/d, the maximum ground surface sinking speed is synchronous with the maximum sinking speed of the key layer, the initial breakage of the key layer leads to the rapid sinking of the ground surface,
the calculation formula is as follows:
dW(t)/dt＝c[W(t)/(1-1-e-ct)-Wk(1-1-e-ct)]
w (t) is a dynamic convergence value at a certain time
WkAs the final subsidence of the earth's surface
1-e-ctIs the amount of change in a certain time
dW (t)/dt is the ground surface sinking speed, when W (t)/(1-1-e)-ct)-Wk(1-1-e-ct) When the value is larger than 0, the sinking speed of the time table is increased, and when W (t)/(1-1-e)-ct)-Wk(1-1-e-ct) When the value is less than 0, the descending speed of the schedule is reduced, but the value is limited by the conditions of the slant length and the length in the model, so that the obtained value has certain deviation from the actual value;
by setting parameters of joints among the blocks of the key layer, the blocks do not move so as to simulate the movement before breaking of the rock of the key layer, when the mining width reaches the breaking distance of the key layer, the joint parameters of the blocks are reduced, the movement after breaking of the key layer is simulated, the breaking of the key layer of overlying strata influences the dynamic process of ground subsidence,
W(t)＝W0+Δω(1-ae-kt)
W0is the maximum subsidence of the earth's surface at the end of the decline period
Delta omega is the residual subsidence value of the earth surface after the end of the decay period
Since W0 is a fixed number, the amount of W (t) sinking is related to a, k and t when 1-ae-ktWhen the value is larger than 0, the W (t) sinking value is increasedWhen 1-ae-ktWhen the value is less than 0, the W (t) sinking value is reduced, and the breaking of the key layer of the overburden rock causes the obvious increase of the surface sinking speed and does not change periodically.
2. The method for analyzing the correspondence between the new surface subsidence dynamic process and the overburden separation layer development according to claim 1, wherein the method comprises the following steps:
excavating according to irregular depth in the simulated coal bed, starting next excavating after model operation after each excavating is stable, when the depth is advanced to 150m, the key layer is subjected to primary breaking, primary period breaking and secondary period breaking respectively, the ground surface subsidence increment is smaller before the key layer is broken, and after the key layer is broken, the ground surface subsidence increment is increased, and the ground surface movement influence angle and the movement influence boundary are not constant,
W(x，y，t)＝Wm(1-x2/a2-y2/b2)(1-e-ct)k
w (x, y, t) is the amount of sinking of any point of the sunken basin at any time
1-e-ctIs the amount of change in a certain time
(1-x2/a2-y2/b2)(1-e-ct)kWhen the product is positive, the amount of W (x, y, t) sinking increases, (1-x)2/a2-y2/b2)(1-e-ct)kWhen the product is negative, the subsidence of W (x, y, t) is reduced, and the influence boundary of the surface subsidence is obviously enlarged along with the increase of a and b.
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