CN109886600B - Method for monitoring and early warning coal seam bifurcation merging area rock burst danger - Google Patents
Method for monitoring and early warning coal seam bifurcation merging area rock burst danger Download PDFInfo
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Abstract
The invention relates to a method for monitoring and early warning of danger of rock burst in a coal seam bifurcation merging area, which comprises the steps of carrying out normalization processing on an impact tendency index, carrying out comprehensive processing on the impact tendency index and a shear stress comprehensive index obtained by a test to obtain a corresponding impact tendency comprehensive judgment index, and judging the danger of the rock burst according to the impact tendency comprehensive judgment index. The method for monitoring and early warning the danger of rock burst in the coal seam bifurcation merging area can realize real-time monitoring and early warning of the danger of rock burst in the target area, is simple and convenient to operate, has lower cost and higher precision, and has wider application range.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to the technical field of coal mining risk avoidance, and specifically relates to a method for monitoring and early warning of rock burst risk in a coal seam bifurcation merging area.
Background
Coal is an important energy source in China, and with the requirements of industrial structure adjustment and environmental protection in recent years, the proportion of petroleum, natural gas and new energy sources is increased, and the consumption of coal resources is reduced. However, the current situation of rich coal, poor oil and less gas makes coal still occupy main energy in the next decades. At present, shallow coal resources in the eastern region are basically exploited, and the exploitation depth gradually develops towards the deep part. Most coal mines in China are expected to enter the mining depth of 1000m to 1500m in the next 20 years. With the arrival of the coal deep mining era, the deep surrounding rock is influenced by three-high one disturbance (high ground stress, high osmotic pressure, high ground temperature and strong mining disturbance), and the coal mine rock burst tends to occur frequently. The impact risk of the original mine with impact disasters is more severe; the impact phenomenon gradually occurs in the original mine without impact disasters. The rock burst refers to the dynamic phenomenon of sudden and violent damage of coal rock mass around a roadway or a working face due to the instantaneous release of elastic deformation energy, and is often accompanied by the phenomena of coal rock mass throwing, banging, air waves and the like. The mine disaster recovery device can not only cause roadway damage, casualties and ground building damage, but also cause gas, coal dust explosion, fire and flood, and interfere with a ventilation system, is one of major disasters of coal mines, and seriously affects the safety and high-efficiency mining of the coal mines. Due to the complexity of coal mine geology and mining conditions, the occurrence time and regions of the rock burst disaster have diversity and outburst, so that the prediction and early warning of the rock burst disaster become a worldwide problem. Especially, the research on the impact disasters of the coal seam bifurcation merging area is not sufficient, and the monitoring and early warning on the impact risks of the coal seam bifurcation merging area have many defects at present, for example, the impact tendency index specified by the national standard is determined by adopting a laboratory test, only represents the attribute of a coal material, and cannot reflect the influence of geology and mining; the elastic wave CT inversion technology cannot realize real-time early warning; the microseism method, the acoustic emission technology and the electromagnetic radiation technology have larger errors and lower accuracy.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for monitoring and early warning the danger of rock burst in a coal seam bifurcation merging area, which can quickly and accurately judge the danger of rock burst in a target area.
In order to achieve the purpose, the method for monitoring and early warning the danger of rock burst in the coal seam bifurcation merging area comprises the following steps:
the method for monitoring and early warning the danger of rock burst in the coal seam bifurcation merging area is mainly characterized by comprising the following steps of:
(1) normalizing the impact tendency index of the coal bed to obtain an impact tendency comprehensive index;
(2) sampling and sampling the branched merging area of the coal seam to carry out an impact shear test to obtain the shear strength and corresponding shear stress comprehensive index of the branched merging area of the coal seam;
(3) comprehensively processing the comprehensive index of impact tendency and the comprehensive index of shear stress to obtain a corresponding comprehensive judgment index of impact tendency;
(4) and judging the rock burst danger of the branched merging area of the coal seam according to the comprehensive judgment index of the impact tendency.
Further, the impact tendency index includes a dynamic failure time index, an elastic energy index, an impact energy index and a uniaxial compressive strength index, and the impact tendency index of the coal seam is normalized to obtain an impact tendency comprehensive index, specifically:
carrying out normalization processing on the impact tendency index according to the following formula to obtain an impact tendency comprehensive index, and carrying out an impact tendency identification test on the coal seam where the forking merging area is located to obtain a numerical value of the impact tendency comprehensive index of the forking merging area of the coal seam:
wherein DT is dynamic destruction time index, WETIs an elastic energy index, KEIs an impact energy index, RcIs a uniaxial compressive strength index, UDTTo be the normalized dynamic destruction time index,
is the normalized elastic energy index (ER),
is the impact energy index after the normalization,
is normalized uniaxial compressive strength index, U1Is a comprehensive index of the impact tendency after normalization.
Furthermore, the collecting and sampling of the branched merging area of the coal seam are carried out with an impact shear test to obtain the shear strength and the corresponding shear stress comprehensive index of the branched merging area of the coal seam, which specifically comprises the following steps:
sampling the coal seam where the branched merging area is located according to a sampling principle, carrying out an impact shear test after processing to obtain the shear strength and the corresponding shear stress comprehensive index of the branched merging area of the coal seam, and carrying out normalization treatment through the following formula:
wherein, U2Is a normalized comprehensive index of the shear stress of the branched merging area of the coal seam, ImaxIs the comprehensive index of the shearing stress of the branched merging area of the coal seam,
τ is the shear stress of the coal seam at the area of the bifurcation and merger, [ τ [ ]]The shear strength of the branched merging zone of the coal seam.
Further, the comprehensive impact tendency index and the comprehensive shear stress index are subjected to comprehensive treatment to obtain a corresponding comprehensive impact tendency judgment index, which specifically comprises:
obtaining a corresponding impact tendency comprehensive judgment index through the following formula:
Uc＝λ1U1+λ2U2；
wherein, UcAn impact tendency comprehensive judgment index, lambda, of the branched merging zone of the coal seam1+λ2＝1，λ1And λ2Are weighted values.
Further, the determining the rock burst risk of the coal seam branch merging area according to the comprehensive impact tendency determination index specifically includes:
lambda is determined from monitoring the seism and stress data of the bifurcated merging zone of the coal seam1And λ2And correcting to obtain data of a corresponding impact tendency comprehensive judgment index so as to judge the rock burst risk of the coal seam in the branched merging area.
By adopting the method for monitoring and early warning the danger of the rock burst in the coal seam bifurcation merging area, the impact tendency index and the shear stress are normalized to form an impact tendency comprehensive judgment index, so that the impact danger in the coal seam bifurcation merging area is judged, the real-time monitoring and early warning of the impact danger in a target area can be realized, the operation is simple and convenient, the cost is lower, the precision is improved, and the method has a wider application range.
Drawings
Fig. 1 is a flowchart of a method for monitoring and early warning of coal seam bifurcation merging area rock burst risk according to the present invention.
Fig. 2 is a structural diagram of a specific implementation of the method for monitoring and early warning of the risk of rock burst in the coal seam bifurcation merging area according to the present invention.
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.
Fig. 1 is a flowchart of a method for monitoring and warning the risk of rock burst in a coal seam bifurcation merging area according to the present invention. Fig. 2 is a structural diagram of a specific implementation of the method for monitoring and warning the risk of rock burst in the coal seam bifurcation merging area according to the present invention.
In one embodiment, the method of the present invention comprises the steps of:
(1) the data processing computer normalizes the impact tendency index of the coal seam to obtain an impact tendency comprehensive index, wherein the impact tendency index comprises a dynamic failure time index DT and an elastic energy index WETImpact energy index KEAnd uniaxial compressive strength index RcThe specific processing formula is as follows, and the data processing computer can calculate DT and W according to data obtained by the impact tendency identification test performed by the coal seam sampling in the bifurcation merging areaET、KEAnd RcThe values of the four indexes are obtained according to the following formula1The value of (c):
wherein, UDTTo be the normalized dynamic destruction time index,
is the normalized elastic energy index (ER),
is the impact energy index after the normalization,
for normalizing the post-uniaxial compressive resistance index, U1Is a comprehensive index of normalized impact tendency;
(2) sampling the coal seam where the branched merging area is located according to a sampling principle, carrying out an impact shear test after processing to obtain the shear strength and the corresponding shear stress comprehensive index of the branched merging area of the coal seam, and carrying out normalization treatment through the following formula:
wherein, U2Is a normalized comprehensive index of the shear stress of the branched merging area of the coal seam, ImaxIs the comprehensive index of the shearing stress of the branched merging area of the coal seam,
τ is the shear stress of the coal seam at the area of the bifurcation and merger, [ τ [ ]]The shear strength of the branched merging zone of the coal seam;
in addition, the data processing computer obtains the stress distribution rule curve of the branched merging area of the coal seam through the data acquired by the underground monitoring substation in real time, and further obtains the maximum principal stress sigma1And minimum principal stress σ3The shear stress data of the branched merging area of the coal seam is obtained through the following formula, and U is obtained through the shear stress data2The value of (c):
(3) the data processing computer comprehensively processes the comprehensive index of impact tendency and the comprehensive index of shear stress through the following formulas to obtain a corresponding comprehensive judgment index of impact tendency:
Uc＝λ1U1+λ2U2；
wherein, UcAn impact tendency comprehensive judgment index, lambda, of the branched merging zone of the coal seam1+λ2＝1，λ1And λ2Are weighted value, λ1Associated with the impact propensity of the coal; lambda [ alpha ]2Related to the stress difference, influenced by the excavation and geological conditions, and in addition, both are influenced by the disturbance of the mine earthquake;
(4) the data processing computer monitors the mine earthquake and stress data of the branched merging area of the coal seam according to the lambda1And λ2And (4) correcting, for example, calculating a corresponding impact tendency comprehensive judgment index by adopting a fuzzy mathematical method, and judging the rock burst risk of the branched merging area of the coal seam.
In a preferred embodiment, a shear stress integration indicator I can be definedmaxAnd impact tendency comprehensive judgment index UcAccording to a criterion, e.g.Tables 1 and 2 show the results of the determination so as to output more concise and clear determination results, and take corresponding rock burst prevention measures according to the results.
TABLE 1 impact hazard criteria (shear stress)
TABLE 2 impact tendency comprehensive judgment index
By adopting the method for monitoring and early warning the danger of the rock burst in the coal seam bifurcation merging area, the impact tendency index and the shear stress are normalized to form an impact tendency comprehensive judgment index, so that the impact danger in the coal seam bifurcation merging area is judged, the real-time monitoring and early warning of the impact danger in a target area can be realized, the operation is simple and convenient, the cost is lower, the precision is improved, and the method has a wider application range.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (3)
1. A method for monitoring and early warning of rock burst danger of a coal seam bifurcation merging area is characterized by comprising the following steps:
(1) normalizing the impact tendency index of the coal bed to obtain an impact tendency comprehensive index;
(2) sampling and sampling the branched merging area of the coal seam to carry out an impact shear test to obtain the shear strength and corresponding shear stress comprehensive index of the branched merging area of the coal seam;
(3) comprehensively processing the comprehensive index of impact tendency and the comprehensive index of shear stress to obtain a corresponding comprehensive judgment index of impact tendency;
(4) judging the rock burst danger of the branched merging area of the coal seam according to the comprehensive judgment index of the impact tendency;
the impact tendency indexes comprise a dynamic failure time index, an elastic energy index, an impact energy index and a uniaxial compressive strength index, and the impact tendency indexes of the coal bed are normalized to obtain an impact tendency comprehensive index, which specifically comprises the following steps:
and normalizing the impact tendency index according to the following formula to obtain an impact tendency comprehensive index:
wherein DT is dynamic destruction time index, WETIs an elastic energy index, KEIs an impact energy index, RcIs a uniaxial compressive strength index, UDTTo be the normalized dynamic destruction time index,
is normalized elastic energyThe amount of the compound to be used is,
is the impact energy index after the normalization,
is normalized uniaxial compressive strength index, U1The impact tendency is a comprehensive index after normalization;
the method is characterized in that the method comprises the following steps of collecting and sampling the branched merging area of the coal seam to carry out an impact shear test to obtain the shear strength and the corresponding shear stress comprehensive index of the branched merging area of the coal seam, and specifically comprises the following steps:
sampling the coal seam where the branched merging area is located according to a sampling principle, carrying out an impact shear test after processing to obtain the shear strength and the corresponding shear stress comprehensive index of the branched merging area of the coal seam, and carrying out normalization treatment through the following formula:
wherein, U2Is a normalized comprehensive index of the shear stress of the branched merging area of the coal seam, ImaxIs the comprehensive index of the shearing stress of the branched merging area of the coal seam,
τ is the shear stress of the coal seam at the area of the bifurcation and merger, [ τ [ ]]The shear strength of the branched merging zone of the coal seam.
2. The method for monitoring and early warning of coal seam bifurcation merging area rock burst danger as claimed in claim 1, wherein the comprehensive impact tendency index and the comprehensive shear stress index are comprehensively processed to obtain a corresponding comprehensive impact tendency judgment index, and specifically the method comprises the following steps:
obtaining a corresponding impact tendency comprehensive judgment index through the following formula:
Uc＝λ1U1+λ2U2；
wherein, UcAn impact tendency comprehensive judgment index, lambda, of the branched merging zone of the coal seam1+λ2＝1，λ1And λ2Are weighted values.
3. The method for monitoring and early warning of coal seam bifurcation merging area rock burst risk according to claim 2, wherein the step of determining the rock burst risk of the coal seam bifurcation merging area according to the comprehensive impact tendency determination index comprises the following steps:
lambda is determined from monitoring the seism and stress data of the bifurcated merging zone of the coal seam1And λ2And correcting to obtain data of a corresponding impact tendency comprehensive judgment index so as to judge the rock burst risk of the coal seam in the branched merging area.
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