受载煤岩随钻参数测定试验装置及耦合关系分析

doi:10.16265/j.cnki.issn1003-3033.2025.08.1440

摘要/Abstract

摘要： 为解决煤矿采掘过程中围岩力学参数非均质和获取困难问题,利用自主研制受载煤岩随钻参数测定试验装置,实时感知岩层强度及结构;分析围压、钻速、转速和旋转扭矩对模拟岩石试样强度的影响,并对采集的随钻参数灰色关联度耦合分析;在受载条件下,通过钻进不同组合类型的分层试件,还原真实环境下钻进煤岩层的效果,验证随钻参数对试件抗压强度识别的准确性。结果表明:试件强度与围压呈正相关,旋转扭矩与钻进速度呈正相关。旋转速度不同时,试件强度基本不变。旋转扭矩、围压、钻进速度、旋转速度与抗压强度关联度分别为0.996、0.831、0.739和0.347。试件强度与旋转扭矩成线性关系。通过分析旋转扭矩曲线的变化特征,可以识别岩层强度,进而定位分界位置。

关键词: 受载煤岩, 随钻参数, 试验装置, 灰色关联度, 分层试样, 分界面

Abstract:

Aiming at the problem of non-homogeneity and difficulty in obtaining the mechanical parameters of surrounding rock in the process of coal mining, the experimental device for determining the parameters of loaded coal rock with drilling was developed independently to realize the real-time perception of strength and structure of rock layer. The effects of circumferential pressure, drilling speed, rotational speed and rotational torque on strength of simulated rock specimens were investigated and analyzed by coupling the gray correlation of collected parameters with drilling. Under loaded conditions, stratified specimens of different combinations of types were drilled in order to restore the actual effect of drilling into coal and rock seams in real environments, and to verify the accuracy of identification of compressive strength of specimens by the following drilling parameters. It was shown that the strength of the specimens was positively correlated with the circumferential pressure, rotating torque and drilling speed. The strength of the specimen remained almost constant when the rotational speed varied. The correlations between rotational torque, circumferential pressure, drilling speed, and rotational speed and compressive strength were 0.996, 0.831, 0.739, and 0.347, respectively. The strength of the specimen was linearly related to the rotational torque. By analyzing the features of change in the rotating torque curve, the strength of the rock formation can be identified and thus the location of the stratum boundary can be located.

Key words: composite coal-rock, drilling parameters, test device, gray correlation degree, layered specimen, interface

中图分类号:

范超军, 孙其旺, 罗明坤, 张佳绩, 赖鑫峰. 受载煤岩随钻参数测定试验装置及耦合关系分析[J]. 中国安全科学学报, 2025, 35(8): 118-128.

FAN Chaojun, SUN Qiwang, LUO Mingkun, ZHANG Jiaji, LAI Xinfeng. Development and coupling relationship analysis of downhole real-time identification experimental device for coal-rock drilling parameters under load[J]. China Safety Science Journal, 2025, 35(8): 118-128.

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试样类型	河砂/ (kg·m^-3)	水/ (kg·m^-3)	水泥/ (kg·m^-3)	抗压强度/ MPa
M5	1 450	310	210	3.49
M7.5	1 450	310	230	4.73
M10	1 450	310	275	7.25
M15	1 450	310	320	8.20
M20	1 450	310	360	11.42
M25	1 450	310	400	12.18
M30	1 450	310	440	13.54

编号	试件类型	钻进速度/ (mm·min^-1)	旋转速度/ (r·min^-1)	围压/ MPa
1	M5	60	300	2
2		60	350	2
3		80	350	2
4		80	350	4
5	M7.5	60	300	2
6		60	350	2
7		80	350	2
8		80	350	4
9	M10	60	300	3
10		60	350	3
11		80	350	3
12		80	350	5
13	M15	60	300	3
14		60	350	3
15		80	350	3
16		80	350	5
17	M20	60	300	4
18		60	350	4
19		80	350	4
20		80	350	7
21	M25	60	300	4
22		60	350	4
23		80	350	4
24		80	350	7
25	M30	60	300	4
26		60	350	4
27		80	350	4
28		80	350	7

编号	试件类型	钻进速度/ (mm·min^-1)	旋转速度/ (r·min^-1)	围压/ MPa
1	M20+M10+M30	80	350	4
2	M15+M7.5+M25	80	350	4
3	M10+M5+M20	80	350	4
4	M15+M5+M30	80	350	4