Calculation method and measuring device for the thickness of loose coal and rock loose circle in deep roadway

Abstract

The present invention discloses a calculation method for calculating the thickness of the loosened zone of the soft coal and rock of a deep roadway and a measurement device based on the method. The calculation method comprises the steps of (1) defining the distance between the initial position of a measuring point and the surface of a roadway to be r and the displacement of the measuring point to be u, and constructing an expression of u varying with r, wherein the measuring point is in the drill hole of the soft coal and rock of the deep roadway and is within the range of the loosened zone, u0, k1 and k2 are coefficients; (2) measuring the varying process of the u of more than two measuring points along with r, and calculating the values of k1 and k2; (3) inputting the obtained values of k1 and k2 into the following equation of L=-k2ln(20k2 / k1), and calculating the value of the thickness L of the loosened zone of the soft coal and rock of the deep roadway. The calculation method is simple, reasonable and easy to implement, and high in calculation accuracy. Obvious errors caused by the empirical estimation can be avoided. Meanwhile, the measurement device is simple in structure and convenient in operation, which can be well be applied to the calculation method of the present invention. In this way, the engineering detection on the thickness of the loosened zone of the soft coal and rock of the deep roadway and the real-time display of the thickness are realized.

Description

Technical field [0001] The invention relates to the field of coal and rock loose zone measurement, in particular to a method for calculating the thickness of the weak coal and rock loose zone in a deep roadway and a measuring device applying the method. Background technique [0002] Weak coal and rock are widespread in deep roadways. The deformation and stability of coal and rock are mainly determined by the swelling of coal and rock within the range of the loose zone. Reasonable determination of the thickness of the loose zone of coal and rock can provide a basis for quantitative selection of reasonable support forms and parameters to maintain coal and rock stability . [0003] At present, common engineering test methods such as sonic wave method and borehole camera method have poor applicability to weak coal and rock in deep roadways. Seismic wave method and geological radar method are complicated and costly. Especially the above methods cannot continuously measure looseness in r...

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Problems solved by technology

[0003] At present, common engineering testing methods such as acoustic wave method and borehole camera method have poor applicability to weak coal rocks in deep tunnels. Seismic wave method and geological radar method are complex and costly to operate and analyze, especially the above methods cannot continuously measure looseness in real time. ring thickness, engineering should not be widely applied

The multi-point displacement meter has been widely used in engineering to measure the displacement of coal and rock in roadways due to its simple and convenient operation. According to the actual measurement results, the empirical analysis of the thickness of coal and rock loose circles has been applied in engineering, but the quantitative determination and real-time prediction of the thickness of coal and rock loose circles have not yet been done. to report

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