Dynamic early warning method of open-pit mine slopes based on integrated displacement information

doi:10.16265/j.cnki.issn1003-3033.2022.03.016

Abstract

Abstract:

In order to effectively use information of multiple measurement points for early-warning and monitoring of slope safety in open-pit mines, considering the importance of displacement monitoring and its variation along with time of measuring points setting and slope height during mining, a dynamic warning method using integrated displacement information was proposed. Firstly, with monitoring profile as a unit, dynamic grading early warning threshold for displacement of each profile was determined through numerical simulation. Secondly, federated Kalman filter was used to integrate monitoring information of different measuring points from the same profile and obtain integrated displacement value representing timely stable state of each profile. Finally, by comparing integrated value with early warning threshold, real-time early-warning for steady state of each profile was realized. Application of the method in a limestone open-pit mine slope, located in Zhongxian county of Chongqing, shows that it can not only fully utilize information of multiple measurement points to send early warning in different regions in real-time, but also predict stability of slopes during mining process.

Key words: information integration, open-pit slope, dynamic warning, numerical simulation, displacement monitoring

FENG Gong, XIA Yuanyou, WANG Zhide, YAN Minjia. Dynamic early warning method of open-pit mine slopes based on integrated displacement information[J]. China Safety Science Journal, 2022, 32(3): 116-122.

Figures/Tables 9

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References 24

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监测坡面	GNSS自动化监测点号			最终坡高/m	合计
17-17'	17-1066	17-1123	—	304	2
18-18'	18-1066	18-1093	18-1138	331	3
19-19'	19-1060	19-1090	—	273	2
II-II'	II-1030	—	—	279	1
III-III'	III-1075	—	—	275	1
A-A'	A-1090	—	—	274	1
F-F'	F-1057	F-1105	—	300	2
合计	—	—	—	—	12

岩性	结构面抗剪参数		结构面刚度/(MPa·m^-1)
岩性	c/MPa	φ/(°)	抗剪刚度	法向刚度
灰岩	0.463	26	25 600	10 000

监测剖面	边坡安全系数1.15		边坡安全系数1.05
监测剖面	拟合曲线表达式	拟合相关系数R²	拟合曲线表达式	拟合相关系数R²
17-17'	y=754exp(-x/71)+152	0.991	y=624exp(-x/83)+204	0.995
18-18'	y=572exp(-x/283)-22	0.985	y=844exp(-x/250)-45	0.979
19-19'	y=409exp(-x/225)+52	0.996	y=492exp(-x/239)+84	0.996
II-II'	y=495exp(-x/134)+146	0.990	y=570exp(-x/150)+152	0.981
III-III'	y=383exp(-x/100)+182	0.992	y=448exp(-x/146)+164	0.998
A-A'	y=319exp(-x/153)+178	0.999	y=439exp(-x/304)+80	0.991
F-F'	y=623exp(-x/97)+114	0.985	y=610exp(-x/112)+114	0.998

测点编号	时间
测点编号	2020-02-28	2020-03-28	2020-04-28	2020-05-28	2020-06-28	2020-07-28	2020-08-28	2020-09-28	2020-10-28
18-1093	40.8	51.4	69.5	92.1	98.1	104.4	123.4	127.3	177.5
18-1138	11.7	15.1	55.1	56.9	76.8	83.2	93.2	115.7	163.3
18-1066	159.5	162.8	170.9	181.4	206.7	213.1	223.1	246.8	294.2
17-1066	34.3	44.4	55.1	56.9	76.8	83.2	87.2	115.7	163.3
17-1123	6.0	8.6	12.9	15.4	43.9	45.9	50.6	78.5	136.5
19-1060	12.4	17.8	24.3	29.0	53.4	54.8	56.7	91.4	122.8
19-1090	4.4	11.5	12.3	22.3	44.7	45.4	46.1	78.4	130.3
II-1030	25.2	30.0	36.1	43.3	50.6	50.6	64.2	82.4	139.7
III-1060	26.6	29.5	35.1	41.7	56.6	62.1	65.0	88.4	144.2
A-1090	9.6	15.8	25.2	29.5	39.3	39.3	44.7	80.3	114.7
F-1057	20.8	31.5	35.8	37.0	41.1	43.9	43.9	82.3	100.9
F-1105	18.4	29.7	33.2	41.1	43.2	43.2	47.5	80.0	131.3

时间	边坡高度/m	位移融合值/mm	一级预警值/mm	二级预警值/mm	预警状态
2020-04-28	112	31.6	307.7	365.8	安全
2020-05-28	112	34.3	307.7	365.8	安全
2020-06-28	124	59.2	283.5	344.1	安全
2020-07-28	124	61.6	283.5	344.1	安全
2020-08-28	124	65.7	283.5	344.1	安全
2020-09-28	135	93.2	264.6	326.7	安全
2020-10-28	144	145.5	251.2	314.1	安全