Surface deformation monitoring and safety and stability evaluation of electricity transmission line crossing mining rights area

doi:10.16265/j.cnki.issn1003-3033.2025.02.0152

Abstract

Abstract:

In order to solve problems of land shortage and transmission line construction in the old urban area, taking the underground goaf of Xiuwu North power transmission substation as the research object, on the basis of clarifying the basic geological conditions and mining conditions of the underground goaf of the transmission substation, SBAS-InSAR monitoring was used to study the development characteristics of surface subsidence. The evolution characteristics of surface subsidence of the transmission line through the mining right area were quantitatively analyzed. The influence of goaf settlement, inclination and curvature on the transmission line of the substation was evaluated. The results show that the maximum average settlement rate of the surface of the study area is -53.6 mm/a, and the location of this area coincides with the location of Guhanshan mine, and the subsidence is consistent with coal mining, and the settlement rate of the tower position is between -16.5--0.3 mm/a. The average settlement rate of No. 11 and No. 35 towers are significantly greater than those of other positions, with the average settlement rates of -15.88 and -16.21 mm/a respectively. The historical tracing of the deformation law shows that the maximum cumulative subsidence occurs at the end of the monitoring period, which is -104.91 and -106.97 mm respectively. According to the most unfavorable principle, it is concluded that the actual monitoring and predicted settlement of the unfavorable points of the interannual deformation rate of the tower in each region during the service life is less than 400 mm, and the maximum inclination and curvature of the tower are 1.2 mm/m and the curvature is 0 mm/m², which are all within the specified minimum allowable value. The surface of the transmission line crossing the mining rights area is in a safe and stable state.

Key words: electricity transmission line, crossing mining rights area, surface deformation monitoring, safety and stability, mined-out area, small baseline subset(SBAS)-interferometry synthetic aperture radar(InSAR)

CLC Number:

X924.2安全监测技术与设备

DONG Jianjun, FENG Xiaoshuo, ZHANG Ying. Surface deformation monitoring and safety and stability evaluation of electricity transmission line crossing mining rights area[J]. China Safety Science Journal, 2025, 35(2): 203-211.

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参数名称	参数值	参数名称	参数值
极化方式	垂直极化 (Vertical transmit, Vertical receive, VV)	辅助数据	12.5 m数字高程模型
波段	C	轨道	升轨
入射角/(°)	39.14	影像数/ 景	80
数据类型	单视复数数据 (Single Look Complex,SLC)	成像模式	干涉宽幅 (Interferometric Wide swath, IW)

点位	经纬度	平均沉降速率/ (mm·a^-1)	点位	经纬度	平均沉降速率/ (mm·a^-1)	点位	经纬度	平均沉降速率/ (mm·a^-1)
1	35°22'10.9″,113°25'50″	-3.15	16	35°17'56″,113°26'8.9″	-3.36	31	35°18'19″,113°26'7″	-6.66
2	35°22'9″,113°25'50.9″	-2.02	17	35°17'12″,113°25'20.9″	-3.22	32	—	—
3	35°22'4.98″,113°25'45.9″	-2.68	18	35°16'40″,113°25'14.9″	-4.33	33	35°18'36″,113°26'6″	-0.75
4	35°21'56″,113°25'45″	-3.58	19	35°16'17″,113°23'53.9″	-4.36	34	35°19'10.9″,113°26'17″	-4.34
5	35°21'54″,113°25'37.9″	-3.10	20	35°16'6.9″,113°23'43″	-5.65	35	35°19'59″,113°25'50.9″	-16.21
6	35°21'28″,113°25'40″	-2.26	21	35°15'7.9″,113°22'48″	-6.26	36	—	—
7	35°21'17.9″,113°25'32.9″	-0.32	22	35°15'6″,113°22'41″	-6.05	37	35°21'2″,113°25'49″	-3.10
8	—	—	23	35°15'10″,113°22'41.9″	-5.75	38	35°21'17.9″,113°25'31″	-0.68
9	35°21'2″,113°25'50″	-5.35	24	35°15'9″,113°22'46.9″	-5.49	39	35°21'29″,113°25'37.9″	-2.11
10	35°21'2″,113°25'50″	—	25	35°16'8″,113°23'43″	-5.74	40	35°21'55″,113°25'36″	-3.54
11	35°19'59″,113°25'51.9″	-15.88	26	—	—	41	35°21'56.9″,113°25'44″	-4.43
12	35°19'12″,113°26'18.9″	-4.10	27	35°16'18″,113°23'53″	-5.50	42	35°22'5″,113°25'44″	-2.92
13	35°18'36″,113°26'7″	-0.95	28	35°16'41.9″,113°25'14″	-3.98	43	35°22'8″,113°25'46.9″	-3.0
14	35°18'19″,113°26'8″	-6.56	29	35°17'12″,113°25'19.9″	-6.45	44	35°21'2″,113°25'49″	-4.15
15	—	—	30	35°17'56″,113°26'8″	-3.25	—	—	—

区域	序号	沉降速率/ (mm·a^-1)	序号	沉降速率/ (mm·a^-1)	序号	沉降速率/ (mm·a^-1)
Ⅰ	1	-2.99	7	-1.06	41	-1.60
	2	-3.87	9	-0.99	42	-3.76
	3	-1.72	37	-0.77	43	-0.77
	4	-0.51	38	-1.83	44	-1.75
	5	-4.55	39	-1.64	—	—
	6	-1.49	40	-3.69	34	-0.84
Ⅱ	11	-1.6	16	-1.05	35	-2.8
	12	-0.80	30	-0.65	—	—
	13	-0.55	31	-2.26	—	—
	14	-2.85	33	-0.95	—	—
Ⅲ	17	-2.34	21	-1.86	25	-0.72
	18	-3.65	22	-1.49	27	-1.02
	19	-1.39	23	-1.64	28	-1.93
	20	-0.66	24	-1.13	29	-2.66

建筑物高度/m	高耸结构基础沉降/mm
≤100	400
(100,200]	300
(200,250]	200

区域	序号	沉降量	序号	沉降量	序号	沉降量
Ⅰ	1	-149.5	7	-53	41	-79.75
	2	-193.5	9	-49.5	42	-188
	3	-86	37	-38.5	43	-38.5
	4	-25.5	38	-91.5	44	-87.5
	5	-227.5	39	-82
	6	-74.5	40	-184.5
Ⅱ	11	-80	16	-52.5	34	-42
	12	-40	30	-32.5	35	-140
	13	-27.5	31	-113	—	—
	14	-142.5	33	-47.5	—	—
Ⅲ	17	-117	21	-93	25	-36
	18	-182.5	22	-74.5	27	-51
	19	-69.5	23	-82	28	-96.5
	20	-33	24	-56.5	29	-133