CN111396056A - Comprehensive treatment method for storage type inclined coal seam goaf under highway - Google Patents
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Abstract
The invention discloses a comprehensive treatment method for a mined-out area of a storage-type inclined coal seam under a highway, which is comprehensively considered and improved from multiple aspects of mined-out area exploration, stability analysis, treatment technology, grouting quality detection and the like, and provides a comprehensive and systematic comprehensive treatment method. The distribution condition of the goaf, the mining condition of each coal mine and the basic characteristics of the coal bed can be accurately obtained through the close combination of geophysical prospecting and geological work. Factors such as the distribution of cavities, the buried depth, the overlying lithology and the roadbed type (excavation and filling) are comprehensively considered, and the treatment range of the goaf is more accurately calculated according to the currently implemented project and relevant specifications in China. The invention detects the grouting quality by four detection methods of drilling, acoustic detection, high-density electrical method and ground deformation detection, and the detection results of different methods can be mutually verified and compared with the investigation result, so that the treatment effect of the goaf can be more intuitively and accurately evaluated.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the field of coal seam goaf treatment, and particularly relates to a comprehensive treatment method for a storage type inclined coal seam goaf under a highway.
[ background of the invention ]
The method is characterized in that a storage coal mining method is a coal mining method applied to mining of a steeply inclined coal seam in the early stage, the working face of the coal mining method is short in continuous advancing distance, the roadway tunneling rate is high, the coal pillar loss is large, the stability of the later mined-out area is very adverse, as time goes on, due to the influence of underground wind and underground water, the coal pillar is stripped in a weathering mode, the supporting function is weakened continuously, the roof plate can deform and peel off, the ground surface subsidence is further caused, the highway construction dead area develops rapidly, the highway is required to be subjected to coal mine mining inevitably, the highway is a typical super-long linear structure, the vehicle is high in running density, high in speed, high in bearing dynamic loading capacity and high in safety and reliability requirements, the mined-out area is influenced by the mined-out area and has special characteristics, the influence of the mined-out area is generally large, few hundred square meters are few, the influence of many square meters is large, the foundation and pavement are influenced by the subsidence of the mining dead area, the foundation and the ground layer, the underground slurry is unreasonable, the influence of the underground slurry injection is caused by the comprehensive detection of 3556, the comprehensive detection of the underground slurry injection, the comprehensive detection of the underground slurry, the safety of the underground slurry injection dead area and the safety of the underground slurry injection of the underground slurry, the underground slurry injection of the existing highway construction is not enough, the safety of the existing highway construction, the safety of the existing highway construction dead area, the safety of the existing highway construction is not enough, the safety of the existing highway is not enough, the safety of the engineering, the safety of the engineering, the safety of the engineering, the safety.
The treatment method has self defects, and no comprehensive treatment method exists for the particularity of the goaf under the expressway.
[ summary of the invention ]
The invention aims to overcome the defects of the prior art and provides a comprehensive treatment method for a storage type inclined coal seam goaf under a highway; the method solves the problem that a storage type inclined coal seam goaf under a highway is lack of a comprehensive and systematic comprehensive treatment method.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a comprehensive treatment method for a storage type inclined coal seam goaf under a highway comprises the following steps:
step 1, exploring a goaf;
exploring the goaf by a geophysical prospecting method, and determining the distribution condition of the goaf, the coal mining condition and the basic characteristics of a coal bed;
performing drilling verification according to the geophysical prospecting result, and determining the boundary of the goaf by combining the geophysical prospecting result and the drilling result;
step 2, performing surface stability analysis in the goaf determined in the step 1, and calculating the grouting control range of the goaf; calculating a protection boundary to be set for the safe coal pillar area where the route passes through;
step 3, grouting the goaf, wherein the grouting material is cement fly ash slurry, and intermittent grouting is adopted in the grouting process;
step 4, detecting the grouting quality through drilling, sound wave detection, a high-density electrical method and a transient electromagnetic method; and monitoring the deformation of the earth surface after the detection is qualified.
The invention is further improved in that:
preferably, the geophysical prospecting method includes a high-density electrical method, a transient electromagnetic method and a sonic detection method.
Preferably, in the step 3, the grouting material is cement fly ash slurry, wherein the water-solid ratio is 1 (1.0-1.3), the solid-solid ratio is 2:8, cement accounts for 20% of the solid-solid ratio, and fly ash accounts for 80% of the solid-solid ratio.
Preferably, in step 3, when grouting the curtain hole, the slurry is doped with the accelerator, and the addition amount of the accelerator is 3% of the mass of the cement.
Preferably, in step 3, the concrete grouting process comprises hole forming, grout stopping and grouting by a drilling machine in sequence.
Preferably, in step 3, the hole opening diameter is 130 mm and the final hole diameter is 91 mm during drilling.
Preferably, in the step 3, the single-layer goaf subjected to grouting is sealed by a flange plate; and sealing the holes in the multilayer goaf by using a sleeve.
Preferably, in the step 3, the sealing hole of the flange is in a phi 50 grouting aperture reducing phi 91 type; the sleeve hole sealing is of a type from phi 130 aperture to final hole diameter.
Preferably, in the step 3, the pressure of a grouting orifice in the grouting process is 0-0.5 MPa, and the pressure of the grouting orifice in the later stage of grouting construction is greater than 1.0 MPa.
Preferably, in the step 3, for grouting holes and curtain holes in the goaf, each grouting is 100-200 m3And (4) intermittent operation is carried out once, the intermittent operation time is 24 hours each time, then grouting is carried out again, and the operation is repeated for 1-3 times.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a comprehensive treatment method for a mined-out area of a storage-type inclined coal seam under a highway, which is comprehensively considered and improved from multiple aspects of mined-out area exploration, stability analysis, treatment technology, grouting quality detection and the like, and provides a comprehensive and systematic comprehensive treatment method. The distribution condition of the goaf, the mining condition of each coal mine and the basic characteristics of the coal bed can be accurately obtained through the close combination of geophysical prospecting and geological work. Factors such as the distribution of cavities, the buried depth, the overlying lithology and the roadbed type (excavation and filling) are comprehensively considered, and the treatment range of the goaf is more accurately calculated according to the currently implemented project and relevant specifications in China. The invention detects the grouting quality by four detection methods of drilling, acoustic detection, high-density electrical method and ground deformation detection, and the detection results of different methods can be mutually verified and compared with the investigation result, so that the treatment effect of the goaf can be more intuitively and accurately evaluated.
Further, the geophysical approach uses a combination of the two approaches. The high-density electric method and the transient electromagnetic method have wide application range, stronger anti-interference capability and higher detection precision, and therefore, the method can be suitable for the exploration work of complex geological conditions such as a goaf and the like. Transient electromagnetic instrument is adopted in transient electromagnetic method detection work, and two geophysical prospecting methods are mutually verified, so that the accuracy of geophysical prospecting is improved.
Furthermore, the safety coal pillar boundary which should be set on the road is calculated by the vertical line method through the evaluation of the ground surface stability, and whether the existing safety coal pillar can meet the requirements or not is judged.
Furthermore, the proportion of water, cement and fly ash in the filling slurry and the proportion of the cement in a solid phase are determined through a large number of parameter tests, the influence mechanism of underground water on the slurry is revealed through the tests, and the method for properly increasing the proportion of the cement in the solid phase ratio in the state with the underground water is provided to improve the strength of a concretion body and shorten the setting time of the slurry.
Furthermore, different types of grouting holes at different positions of the goaf are distinguished, and an intermittent grouting process is provided for the grouting holes and the curtain holes at the cavity position, so that a grouting effect can be better guaranteed. According to the difference between the single-layer goaf and the multi-layer goaf, effective grouting and grout stopping methods are respectively provided through tests.
Furthermore, the grouting quality is detected by four detection methods, namely drilling, acoustic detection, a high-density electrical method and ground deformation detection, detection results of different methods can be mutually verified and compared with a survey result, and the grouting effect of the goaf can be accurately judged.
[ description of the drawings ]
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of calculation of goaf road length (course direction is perpendicular to coal seam direction);
FIG. 3 is a schematic diagram of calculation of lateral width (when the longitudinal direction is perpendicular to the direction of the stratum) of a goaf road;
FIG. 4 is a graph of post-grouting resistivity;
FIG. 5 is a WA-4 high density electrical resistivity inversion chart of an example;
FIG. 6 is a WA-11 high density electrical resistivity inversion chart of an example;
FIG. 7 is a WA-33 high density electrical resistivity inversion chart of an example;
FIG. 8 is a schematic longitudinal section of a mine site according to an embodiment;
FIG. 9 is a boundary diagram of a protective pillar according to an embodiment;
wherein, (a) is a 45# coal seam; (b) the figure is 43# coal seam; (c) the figure is 42# coal seam
[ detailed description ] embodiments
The invention is described in further detail below with reference to the accompanying drawings:
in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention discloses a comprehensive treatment method for a goaf of a storage-type inclined coal seam under a highway, which aims at the treatment range of the goaf, and comprises the treatment length along the axial direction of the highway, the treatment width vertical to the axial direction, the underground treatment depth and the height of a grouting section, with reference to figures 2 and 3. And (3) in the calculation, referring to 'design and construction rules of roads in the goaf', wherein the length of goaf treatment is the actual distribution length of the road route to the goaf, and the influence range of the overlying strata movement angle is considered.
Referring to fig. 1, the method specifically includes the following steps:
1. goaf investigation
1.1 exploration by geophysical prospecting method
In the goaf exploration work, because the geophysical prospecting working method has conditionality, multiple resolvability and regionality, the exploration method which is mutually verified by a plurality of geophysical prospecting methods is generally adopted, wherein the high-density electrical method and the transient electromagnetic method have wide application range, stronger anti-interference capability and higher detection precision, and therefore, the exploration work of complex geological conditions such as a goaf can be suitable for the goaf, the high-density electrical method detection work adopts a high-density direct current electrical method instrument, the number of electrodes is 120, the electrode distance is 5m, the power supply voltage is more than 350V, a measuring device mainly adopts a temperature device and locally adopts a tripolar device and a dipole device, the number of long-section temperature-sensitive rolling measurement coincident electrodes is 90 in a key area, 60 in a non-key area, the requirements of transverse and longitudinal resolution of detecting 130m depth can be met, 150m depth can be deduced, the anti-interference capability is stronger, the higher detection precision is realized, the transient electromagnetic method adopts the transient electromagnetic method, the transmitting coil is 20m × m, 2 turns, the receiving coil 20m × m, the transmitting current is 5.5.5.5.5.5.5.5.5.5.20.5.5.20.20.5.5.20.20.5.5.20.20.20.20.20.20.10.10.10-times of the coal mining geological conditions of coal mining trend characteristic of mining curve obtained by means of correlation, the mining by correlation, the mining curve obtained by correlation, the mining curve of mining curve obtained by the mining curve of the mining is obtained by the correlation, the mining curve of the mining process, the mining curve of the mining process, the mining process of the mining process, the mining process of mining process, the mining process.
1.2 drilling
And selecting a geophysical abnormal region for drilling verification (high-resistance abnormity and low-resistance abnormity) according to the geophysical detection result. Comprehensively considering the broken condition of the drill core, the drill jamming and the slurry leakage in the drilling process, and judging the geological overview of the abnormal area. And then, correcting the geological interpretation result by combining the geophysical prospecting result with the verification drilling data, and then delineating the boundary of the goaf and the stable boundary of the goaf.
2. Stability analysis
① analyzing and evaluating the surface stability, namely, taking the ratio of the height of the caving fissure zone to the burial depth of the goaf as an index for evaluating the stability of the goaf, calculating the height of the caving fissure zone of the goaf according to actual geological survey data and relevant specifications, and comparing the burial depth of a coal seam roof with the height of the caving fissure zone, wherein if the ratio of the burial depth of the coal seam roof to the height of the caving fissure zone is more than 1, the caving fissure zone is not developed to the surface, and the surface can be regarded as stable or basically stable, and conversely, if the ratio is less than 1, the caving fissure zone is communicated with the surface, and the surface can be seriously collapsed and deformed and is regarded as unstable.
② calculation of boundary of safety coal pillar for road, in order to ensure the earth surface building not to be affected in the problem of coal pillar reservation in mining subsidence science, the method for reserving the coal pillar in the coal mining process is described in detail, wherein the common vertical line method is to reserve the coal pillar by analytic method.
3. Grouting
3.1 grouting Material
The grouting material adopts slurry of cement and fly ash, and is determined by the following parameter results when the proportion is determined: the dry material content of the slurry per cubic meter, the slurry density, the initial and final setting time, the calculus rate and the unconfined compressive strength of the test block stone body, wherein the final strength of the test block stone body is more than or equal to 0.6 MPa.
When the cement fly ash slurry is finally adopted, the water-solid ratio is 1: 1.0-1: 1.3, the solid-solid ratio is 2:8, cement accounts for 20% of the solid-solid ratio, and fly ash accounts for 80% of the solid-solid ratio. And under the reducing environment (under the condition of filling water in the goaf), the strength of the grouting concretion body is reduced. Therefore, the proportion of the cement in the solid phase ratio can be appropriately increased in the grouting hole construction. When the curtain hole is used for grouting construction, an accelerating agent accounting for 3% of the weight of cement is added into the grout, so that the grout poured into the goaf is solidified as soon as possible to form a curtain, and the loss of the grout flowing out of a treatment area is reduced. When the grouting amount of the grouting hole is larger, besides other construction measures (aggregate feeding), an accelerator accounting for 3 percent of the weight of cement can be added into the grout, so that the grout filled into the goaf can be solidified as soon as possible, and the flowing of the grout is controlled.
3.2. Grouting process
The concrete process of the grouting process comprises the steps of drilling by a drilling machine → casing pipe grouting stop or flange plate grouting stop → grouting in sequence, and the concrete parameters of the whole grouting process are as follows:
(1) the drilling process comprises the following steps: the hole forming process for the drilling construction of the steeply inclined coal seam in the goaf is realized by adopting the hole opening aperture of phi 130 and the final hole aperture of phi 91.
(2) Grouting and stopping grouting: the single-layer goaf (cavity) adopts a flange plate hole sealing (phi 50 grouting aperture) diameter-variable phi 91 type; for a multilayer goaf (cavity) and when the distance is larger, a sleeve is adopted for sealing (phi 130 aperture) until a final hole is not changed.
(3) Grouting pressure: in the grouting process, the pressure of a grouting orifice fluctuates between 0 and 0.5MPa, the later stage of grouting construction is controlled to be more than 1.0MPa, and the filling of the residual cavities or cracks cannot be completed only by the gravity of the grout in the later stage. For grouting holes and curtain holes at the goaf part, an intermittent grouting process is required, namely, each grouting is 100-200 m3And (4) carrying out intermittent operation once at left and right, controlling the intermittent time at about 24 hours each time, then grouting, and repeating the operation for 1-3 times. For foundation grouting holes, the gaps in the foundation are smallerThe grouting amount is small, and the grouting process has no intermittent one-time construction except special conditions.
4. Grouting quality detection
The grouting quality is detected by four detection methods, namely drilling, acoustic detection, a high-density electrical method and ground deformation detection, detection results of different methods can be mutually verified and compared with an exploration result, and the grouting effect of the goaf can be accurately judged.
4.1 drilling: and arranging a certain number of detection holes according to the size of the detection area range, wherein the detection holes comprise a background value test hole and a post-grouting detection hole. Extracting a core of a grouting section through drilling, carrying out comparative analysis on the core before and after grouting, counting the shape, the spreading characteristics, the thickness and the cementing quality of cement stones in the core and the condition that a rock mass crack is filled with the cement stones, sampling, carrying out a physical and mechanical property experiment, and analyzing the physical and mechanical property change condition of a rock sample before and after grouting. And finally, carrying out secondary grouting on the detection hole, and analyzing the grouting amount to indirectly judge the grouting filling rate.
The key point of the work of the drilling detection method is that whether the rock cores of the slurry concretion body, coal and other rock bodies can be drilled at the position of the coal seam goaf or not is verified through recording and analyzing the rock cores of the drill holes, meanwhile, the drilling condition of the drill holes is tracked and observed, whether abnormal conditions such as drilling falling, over-fast footage and the like exist or not is recorded, and therefore whether the goaf is completely filled with grouting slurry or not is judged, and grouting is needed again if the goaf is incomplete.
4.2 sound wave detection: the drilling wave velocity detection adopts a single-hole method wave velocity detection technology and a drilling ultrasonic method detection technology respectively. The single-hole method wave velocity detection mainly aims at shallow rock-soil layers, the ultrasonic wave velocity detection mainly aims at deep rock-soil layers, and detection indexes of all detection holes are summarized and analyzed according to detection conditions. According to the regulations of JTG/TD31-03-2011 in gob highway design and construction technical rules, the transverse wave velocity of the rock-soil mass is more than 250.0m/s, which indicates that the transverse wave velocity of the rock-soil mass is improved after grouting, the compactness is reinforced, and the grouting reinforcement effect is good.
4.3 detecting by a high-density electric method and a transient electromagnetic method: and (3) comparing the resistivity of the goaf grouting body obtained by performing a high-density electrical method experiment at the obvious goaf position with a standard value (field test before grouting), and evaluating the quality of the engineering grouting effect. Referring to fig. 4, if the resistivity is obviously improved after grouting, the overall apparent resistivity is more than 80 Ω · m, and the two pieces are connected together, the grouting filling effect is obvious.
In the 4.2-4.3 detection method, if the detection result of a certain time is not good, besides the detection determination result of a plurality of times, the detection method is compared with other geophysical detection methods, drilling verification is carried out after the problem is determined, and repairing measures are considered according to the verification result.
4.4 ground deformation monitoring: according to design files and relevant specifications, the monitoring level of the goaf is set to be three levels, and monitoring items, measuring point arrangement and monitoring precision are shown in table 1.
TABLE 1 monitoring project, station layout and monitoring accuracy chart
The period of each monitoring object is divided into two stages, namely a construction period and a stabilization period, the monitoring is started for the first time after the monitoring points are buried for a week and are basically stable, the monitoring is performed once every month before the highway is communicated, and the monitoring is performed once every two months after the highway is communicated. The control values of the monitoring items are shown in table 2.
2 standard of control for deformation observation
| Inclination i (mm/m) | ≤±3.0 |
| Vertical curvature k (× 10)-3/m) | ≤±0.2 |
| Horizontal deformation ε (mm/m) | ≤±2.0 |
Examples
1. Goaf exploration
The east-west strike of the well field of a certain mine field is 964m long, the south-north width is 794m, and three coal seams of No. 42, No. 43 and No. 45 are mined. The coal seam mining level is 593-643 m, the mining depth is 200-250 m, the coal seam thickness is 30-40 m, the coal seam inclination angle is 41-46 degrees, and the mining trend is nearly orthogonal (80-90 degrees) to the line trend. The earth surface is distributed with wide subsidence basins along the coal seam trend direction, most subsidence basins are filled and leveled, and the earth surface is covered by artificial vegetation. The sunk basin has a plurality of step-shaped cracks in the north-south direction, and the trend is 60-65 degrees. The mining mode of the mining area is a storage mode, and mining is stopped at present.
At present, geophysical prospecting methods are widely applied in goaf exploration, and common methods comprise seismic exploration, geological radar, a high-density electrical method, a Transient Electromagnetic Method (TEM) and the like. In consideration of geological and geophysical characteristics of the present survey area (steep dip of the strata greater than 45 °), seismic methods cannot accept reflected waves and are therefore not suitable. The effective detection depth of the surface wave and geological radar method is 20-30m, and the requirement of goaf depth (below 50-150 m) cannot be met, so the geophysical prospecting adopts a high-density resistivity method. And (3) performing data inversion according to the field survey result to obtain resistivity inversion graphs of all the sections, wherein part of typical sections are shown in figures 5-7. And according to the geophysical result, selecting a typical section for result analysis and carrying out inspection and correction in combination with drilling.
The WA-4 profile shown in fig. 5 is located above the roof of a 42# or 43# coal seam and runs substantially in line with the coal seam. In the resistivity inversion graph, 105m of electrodes of 310-400 m are under the deep part and the west part of the resistivity inversion graph, and mining areas and subsidence areas of a certain mine field are inferred under the electrodes of 320-590 m in combination with mine data. The drill hole is positioned in a mining boundary damage area, the core is broken, slurry leakage and drill sticking are serious during drilling, and drilling cannot be carried out due to slurry leakage and drill sticking after the drill hole drills for 91 m. The geophysical prospecting interpretation result is basically consistent with the drilling result according to the verification result of the drilling, and the interpretation is reliable. The WA-11 section inspection drill hole is located 70m north of the WA-4 section 220m electrode, and as can be seen from the graphs in FIGS. 5 and 6, the high-density electrical resistivity inversion graph of WA-11 with the electrode of 80-130 m is caused by the same coal mine mining collapse as the high-density electrical resistivity inversion graph of WA-4 with the electrode of 190-230 m. The geophysical conditions in both fig. 6 and fig. 7 are basically consistent with the drilling result, and the geophysical explanation is reliable. From the survey results, a particular longitudinal section of the mine is plotted, as shown in fig. 8.
2. Stability analysis
(1) Surface stability analysis and evaluation step:
the 42#, 43#, 45# coal seams in a certain area are studied, and the calculation results are shown in the following table 3 according to the formula:
TABLE 3 goaf stability evaluation result table
As can be seen from Table 3, in the coal seams No. 42, No. 43 and No. 45 in a certain mine, the ratio of the top plate burial depth to the caving fracture zone is less than 1, and then the caving fracture zone has developed to the surface of the goaf. The coal seams No. 42 and No. 45 are thick, the height of the caving fracture zone is far greater than the burial depth of the top plate of the goaf, and the caving zone of the goaf is preliminarily presumed to have developed to the ground surface, so that the ground surface can have serious collapse, and the ground layer is extremely unstable. If a road is built above the goaf for construction, the goaf is easy to be activated again, so that collapse is caused, and the construction and operation of the highway are influenced.
(2) In the calculation of road safety coal pillar boundary
According to the vertical line method in mining subsidence science, protective coal pillars are required to be arranged on three coal beds of 42#, 43#, and 45 as calculation objects, the protected objects to be calculated are expressways, and according to geological survey data, the directions of the expressways and the coal bed trend directions are orthogonal, it is presumed that vertical lines made by the protected boundaries on two sides of the roads are necessarily parallel to the coal bed trend directions, namely, the angle of intersection of the protected area boundaries and the coal bed trend is 90 degrees, the rock stratum moving angle in the goaf trend direction is 67 degrees, the overlying strata moving angle is 45 degrees, and the actual working condition of each coal bed is combined to obtain the boundaries to be arranged as shown in fig. 9.
As can be seen from the diagrams (a), (b) and (c) of fig. 9, in order to ensure that the road is not affected by the goaf, the three coal seams have safety coal pillar boundaries, and the protective coal pillar boundaries are not completely covered. The area of the existing safety coal pillars is not enough to protect the construction and operation of the highway, and the goaf under the highway needs to be treated.
3 grouting
(1) The grouting material is cement fly ash slurry, wherein the water-solid ratio is 1: 1.0-1: 1.3, the solid-solid ratio is 2:8, and the ratio of cement to fly ash is 1: 1-1: 3; the cement accounts for 20% of the solid phase ratio, and the fly ash accounts for 80% of the solid phase ratio.
(2) In the grouting process, a hole forming process with the hole opening diameter of phi 130 and the final hole diameter of phi 91 is adopted for drilling construction of the steeply inclined coal seam in the goaf.
(3) The pressure of a grouting orifice fluctuates between 0 and 0.5MPa in the grouting process, and the later stage of grouting construction is controlled to be more than 1.0 MPa. For grouting holes and curtain holes at the goaf part, an intermittent grouting process is required, namely, each grouting is 100-200 m3The slurry is injected after the slurry is injected for 2 times after the slurry is left and right intermittently for 24 hours. For foundation grouting holes, the gaps in the foundation are smaller, the grouting amount is small, and the grouting process has no intermittent one-time construction except special conditions.
4. Grouting quality detection
The reinforcing treatment of the goaf belongs to underground hidden engineering, so the comprehensive quality evaluation of the treatment effect is very important. Four detection methods, namely drilling, acoustic detection, a high-density electrical method and ground deformation detection, are adopted in a research area, and the results show that: the transverse wave velocity of the grouted rock mass is more than 250.0m/s, the resistivity is obviously improved, the core taking rate is 75-95%, the total settlement of the earth surface is-1.1-1.5 mm, and the evaluation standard of the field stability grade of the goaf is met. Therefore, the whole treated goaf site can be considered to be in a stable state
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A comprehensive treatment method for a storage type inclined coal seam goaf under a highway is characterized by comprising the following steps:
step 1, exploring a goaf;
exploring the goaf by a geophysical prospecting method, and determining the distribution condition of the goaf, the coal mining condition and the basic characteristics of a coal bed;
performing drilling verification according to the geophysical prospecting result, and determining the boundary of the goaf by combining the geophysical prospecting result and the drilling result;
step 2, performing surface stability analysis in the goaf determined in the step 1, and calculating the grouting control range of the goaf; calculating a protection boundary to be set for the safe coal pillar area where the route passes through;
step 3, grouting the goaf, wherein the grouting material is cement fly ash slurry, and intermittent grouting is adopted in the grouting process;
step 4, detecting the grouting quality through drilling, sound wave detection, a high-density electrical method and a transient electromagnetic method; and monitoring the deformation of the earth surface after the detection is qualified.
2. The comprehensive treatment method for the goaf of the underground storage inclined coal seam of the expressway according to claim 1, wherein the geophysical prospecting method comprises a high-density electrical method, a transient electromagnetic method and a sound wave detection method.
3. The comprehensive treatment method for the mined-out area of the storage-type inclined coal seam under the highway according to claim 1, characterized in that in the step 3, the grouting material is cement fly ash slurry, wherein the water-solid ratio is 1 (1.0-1.3), the solid-solid ratio is 2:8, the cement accounts for 20% of the solid-solid ratio, and the fly ash accounts for 80% of the solid-solid ratio.
4. The comprehensive treatment method for the mined-out area of the storage-type inclined coal seam under the highway according to claim 1, characterized in that in the step 3, when grouting is carried out on the curtain hole, the grout is doped with the accelerating agent, and the adding amount of the accelerating agent is 3% of the mass of the cement.
5. The comprehensive treatment method for the mined-out area of the storage-type inclined coal seam under the highway according to any one of claims 1 to 4, wherein in the step 3, concrete processes of grouting comprise hole forming, grout stopping and grouting by a drilling machine in sequence.
6. The comprehensive treatment method for the mined-out area of the storage-type inclined coal seam under the highway according to claim 5, wherein in the step 3, the hole opening diameter is phi 130 and the final hole diameter is phi 91 during drilling.
7. The comprehensive treatment method for the mined-out area of the underlying storage-type inclined coal seam of the expressway as claimed in claim 5, wherein in the step 3, the single-layer mined-out area subjected to grouting is sealed by a flange plate; and sealing the holes in the multilayer goaf by using a sleeve.
8. The comprehensive treatment method for the mined-out area of the storage-type inclined coal seam under the highway according to claim 7, characterized in that in the step 3, the flange sealing is of a phi 50 grouting bore diameter reducing phi 91 type; the sleeve hole sealing is of a type from phi 130 aperture to final hole diameter.
9. The comprehensive treatment method for the mined-out area of the storage-type inclined coal seam under the highway according to claim 5, wherein in the step 3, the pressure of a grouting hole in the grouting process is 0-0.5 MPa, and the pressure of the grouting hole in the later stage of grouting construction is greater than 1.0 MPa.
10. The comprehensive treatment method for the goaf of the underground storage type inclined coal seam of the expressway as claimed in claim 5, wherein the step 3 is performedFor grouting holes and curtain holes in the goaf, each grouting is 100-200 m3And (4) intermittent operation is carried out once, the intermittent operation time is 24 hours each time, then grouting is carried out again, and the operation is repeated for 1-3 times.
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