CN202914103U

CN202914103U - Overlying rock beam fault zone height and range monitoring system of coal mine stope

Info

Publication number: CN202914103U
Application number: CN 201220628832
Authority: CN
Inventors: 文志杰; 蒋宇静; 朱祝武; 王刚; 吴学震
Original assignee: Shandong University of Science and Technology
Current assignee: Shandong University of Science and Technology
Priority date: 2012-11-14
Filing date: 2012-11-14
Publication date: 2013-05-01
Anticipated expiration: 2022-11-14

Abstract

The utility model discloses an overlying rock beam fault zone height and range monitoring system of a coal mine stope. A row of horizontal monitoring holes is arranged in the outer side coal body in a conveying crossheading or a rail crossheading of the stope; the 4-6 horizontal monitoring holes are 1 m higher than the bottom surface of a roadway, the hole distance is 2-4 m, the hole depth is 3-5 m, and the diameter is 42 mm or 45 mm; pressure sensors are placed in the monitoring holes; data collecting equipment is arranged in the advancing direction of the stope 100 m to an observing point; data conducting wires of the pressure sensors are led out from the holes, and extend to the inside of the data collecting equipment; and data collected by the data collecting equipment is transmitted to a data analyzing and processing device. The overlying rock beam fault zone height and range monitoring system can be applied in the filed of motion monitoring of overlying rock in the stope during the coal mining, and height and range of the overlying rock beam fault zone height and range monitoring system of the coal mine stope can be quickly obtained, so as to estimate the destroy degree and motion state of the overlying rock as well as the stress state of supporting rock on the two sides of the stope.

Description

Overlying strata beam fault zone height and scope monitoring system on the stope of colliery

Technical field

The utility model relates to the coal mining field, relates in particular to stope overlying strata motion monitoring technology in the process of coal mining.

Background technology

The colliery stope advances caused movement, to cause to adopt the basic reason that stress field of the surrounding rock changes, it also is the coal mine roof plate collapse accident, coal and Gas Outburst, bump, the root of the disasters such as Underwell permeable accident and subsidence, Real-Time Monitoring Overlying Strata In A Face destructiveness with and motion state be the important means that the disaster prevention accident occurs, and overlying strata beam fault zone height and scope are to determine the Overburden Rock Failure degree on the stope, stress state with and the deciding factor of motion state, determine fast that therefore overlying strata beam fault zone height and scope are significant for guarantee work safety of coal mine on the stope.

The method of monitoring Overburden Rock Failure degree is pouring water into borehole method and pre-buried displacement meter method at present.Determine the fissure zone spreading range by the pouring water into borehole method, measure rock deformation by pre-buried displacement meter method.But crack propagation scope and rock deformation all can not definitely reflect overlying strata beam fault zone height on the stope.That is to say, even overlying rock has the crack, but should not necessarily rupture fully by place's rock beam, field practice shows that the expansion of overlying rock horizontal fissure generally is higher than vertical crack, and the pouring water into borehole method can not be distinguished two class cracks.Equally, even overlying rock has certain displacement, this place's rock beam is not necessarily fully fracture also, and this displacement may be sunk to causing by the rock mass elastic buckling.So above-mentioned two kinds of methods all can not be monitored out overlying strata beam fault zone height and scope on the real stope.In addition, above-mentioned two kinds of methods expend time in longer, and cost is higher.

The utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art, and overlying strata beam fault zone height and scope monitoring system on the stope of a kind of colliery are provided.Can monitor stope both sides rock mass stress by this system, can extrapolate accurately and rapidly overlying strata beam fault zone height and scope on the stope according to the STRESS VARIATION data.

For achieving the above object, the technical scheme that the utility model monitoring system is taked is:

It is the monitoring holes that outside coal body in stope haulage gate or track crossheading is provided with a row of horizontal, and monitoring holes is apart from bottom surface, tunnel height 1m, and quantity is 4-6, and distance between borehole is 2-4m, and hole depth is 3-5m, and diameter is 42mm or 45mm; In monitoring holes, be furnished with pressure sensor; Be provided with data acquisition equipment apart from observation point greater than 100m position far away at the stope direction of propulsion; The data call wire of pressure sensor is drawn from the aperture, and extends the access data collecting device, and the transfer of data that data acquisition equipment gathers is to the data analysis processor.

The utlity model has following useful technique effect:

The utility model can be applicable to stope overlying strata motion monitoring field in the process of coal mining, obtains fast overlying strata beam fault zone height and scope on the stope of colliery, to estimate the stress state of Overburden Rock Failure degree, motion state and stope supported on both sides rock mass.Adopt the stress wave monitoring to replace displacement monitoring, more can accurately reflect the rock beam crack conditions, and equipment cost reduces greatly.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing and the specific embodiment:

Fig. 1 is the utility model monitoring system layout use figure;

Fig. 2 is certain Overlying Strata In A Face composite columnar section;

Fig. 3 is the curve synoptic diagram of the support rock mass stress fluctuation that monitors of the utility model;

Fig. 4 is the schematic diagram according to overlying strata beam fault zone height and scope on the definite stope of the utility model.

Marginal data: 1-coal-face, 2-track crossheading, 3-monitoring holes, 4-pressure sensor, 5-data call wire, 6-data acquisition equipment, 7-data analysis processor.

L ₀Represent Width of stope, L ₁Represent coal-face apart from the distance of monitoring holes, H represents the height of rock beam fault zone.

The specific embodiment

As shown in Figure 1, it is the monitoring holes 3 that outside coal body in stope haulage gate or track crossheading is provided with a row of horizontal, and monitoring holes 3 is apart from bottom surface, tunnel height 1m, and quantity is 4-6, and distance between borehole is 2-4m, and hole depth is 3-5m, and diameter is 42mm or 45mm; In monitoring holes 3, arrange pressure sensor 4; Greater than 100m position far away data acquisition equipment 6 is set apart from observation point at the stope direction of propulsion; The data call wire 5 of pressure sensor 4 is drawn from the aperture, and extends access data collecting device 6, and the transfer of data that data acquisition equipment 6 gathers is to data analysis processor 7.

During use,

The first step: at first by the stratum composite columnar section in corresponding exploiting field, colliery, as shown in Figure 2, obtain the Overlying Strata In A Face structure, comprise thickness and the composition and property of each rock stratum;

Second step: set up observation point and monitoring system

As shown in Figure 1, in stope track crossheading 2, set up observation point, at the monitoring holes 3 of observation point to stope outside rock mass Drilling one row of horizontal, monitoring holes 3 is apart from bottom surface, tunnel height 1m, and quantity is 4-6, and distance between borehole is 2-4m, hole depth is 3-5m, and diameter is 42mm or 45mm; In monitoring holes 3, arrange pressure sensor 4; Greater than 100m position far away data acquisition equipment 6 is set apart from observation point at the stope direction of propulsion; The data call wire 5 of pressure sensor 4 is drawn from monitoring holes 3 apertures, and extends access data collecting device 6;

The 3rd step: monitoring stope both sides rock mass stress obtains the stress fluctuation curve

When equaling 1/4 Width of stope apart from monitoring holes, coal-face (namely works as L among Fig. 1 ₁=1/4L ₀The time, L ₀Be Width of stope), the beginning monitoring, pressure sensor 4 is transferred to data acquisition equipment 6 with the stress fluctuation signal of the stope both sides rock mass that monitors, and data acquisition equipment 6 is delivered to data analysis processor 7 with the signal of collecting; Along with work plane is pushed ahead, the stress of place, monitoring point country rock is begun to raise by initial stress, and the stress of place, monitoring point country rock reaches peak value afterwards; After stress reached peak value, the rock mass at place, monitoring point began fragmentation and causes stress to reduce; Continue to advance with work plane, cover the fracture of the first rock beam on the stope, cause that place, monitoring point rock mass stress raises again, begin again subsequently to reduce, afterwards every one deck rock beam fracture all can cause similar stress fluctuation; Cross data acquisition equipment 6 rear end monitorings at coal-face; Data analysis processor 7 analysis-by-synthesis stress fluctuation data obtain the curve of stress fluctuation; The curve of stress fluctuation as shown in Figure 3, A, B, C, D point are peak stress among Fig. 3;

The 4th step: height and the scope thereof of determining the rock beam fault zone according to the stress fluctuation peak of curve

Because each fault rupture of overlying strata beam all can have the stress wave peak value to occur on the stope, and then obtain the number of plies of overlying strata beam rupture failure on the stope according to the number of times that the stress wave crest value occurs; According to thickness and the Width of stope of the number of plies and known each rock stratum, can obtain height H and the approximate range thereof of rock beam fault zone, as shown in Figure 4 again.A, B, C, D point peak stress among Fig. 3, the respectively fracture of I, II, III, IV rock beam in the corresponding diagram 4.Rock beam V represents the rest layer among Fig. 4, and this layer is fracture not.

Claims

1. overlying strata beam fault zone height and scope monitoring system on the colliery stope, it is characterized in that, it is the monitoring holes that outside coal body in stope haulage gate or track crossheading is provided with a row of horizontal, monitoring holes is apart from bottom surface, tunnel height 1m, quantity is 4-6, distance between borehole is 2-4m, and hole depth is 3-5m, and diameter is 42mm or 45mm; In monitoring holes, be furnished with pressure sensor; Be provided with data acquisition equipment apart from observation point greater than 100m position far away at the stope direction of propulsion; The data call wire of pressure sensor is drawn from the aperture, and extends the access data collecting device, and the transfer of data that data acquisition equipment gathers is to the data analysis processor.