西部矿区深埋厚煤层采动覆岩离层发育规律数值模拟研究

谢道雷; 苗田雨; 韩承豪; 王凯; 王厚臣; 柴德洋; 高洁

doi:10.13347/j.cnki.mkaq.20231424

西部矿区深埋厚煤层采动覆岩离层发育规律数值模拟研究

1.
山东科技大学地球科学与工程学院，山东青岛 266590
2.
山东科技大学能源采矿工程学院，山东青岛 266590
3.
肥城白庄煤矿有限公司，山东泰安 271000
4.
山东泰山能源有限责任公司协庄煤矿，山东泰安 271000

详细信息

作者简介:
谢道雷（1984—），男，山东菏泽人，副教授，博士，主要从事矿井水文地质、水害防治与环境地质方面的教学与研究工作。E-mail：skd994469@sdust.edu.cn

中图分类号: TD745
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出版历程
- 收稿日期: 2023-10-06
- 修回日期: 2023-11-06
- 刊出日期: 2024-04-19

Numerical simulation study on development law of mining-induced overburden separation layer in deep and thick coal seam in western mining area

1.
College of Earth Science & Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2.
College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
3.
Feicheng Baizhuang Coal Mine Co., Ltd., Tai’an 271000, China
4.
Xiezhuang Coal Mine, Shandong Taishan Energy Co., Ltd., Tai’an 271000, China

摘要

摘要:
为了丰富离层发育规律的研究方法，以石拉乌素矿221_上08工作面为对象，通过分布式光纤（BOTDR）及定点光纤对离层位置进行综合确定，结合颗粒流PFC^2D数值模拟，对大采高、大采深条件下采动覆岩离层发育规律进行研究。结果表明：随着工作面推进，离层空间在关键层底部自下而上向主关键层底部发育，离层发育埋深在440、396、376、331、321、296 m附近，层位止于粗砂岩主关键层底部；覆岩运移主要经历下位关键层沉降、上位亚关键层快速沉降、向粗砂岩主关键层底部发展、主关键层运移阶段；离层层位与工作面推进距离呈正比，且离层发育主要分为孕育（Ⅰ）-加速扩容（Ⅱ）-压密阶段（Ⅲ）3个阶段。
- 离层运动规律 /
- 分布式光纤 /
- 定点光纤 /
- 颗粒流PFC^2D /
- 离层空间
Abstract:
To enrich the research methods for studying the development law of bed separation, this paper takes the upper 08 working face of 221 in Shilawusu Mine as the research object, and comprehensively determines the location of bed separation through distributed optical fiber (BOTDR) and fixed-point optical fiber. The particle flow code (PFC^2D) is used to study the pattern of the separation layer development under the conditions of large mining height and large mining depth. The results show that, as the working face advances away from the cutting hole, the separated layer develops intermittently from the bottom to the bottom of the key layer, and the depth of separation layer development is around 440 m, 396 m, 376 m, 331 m, 321 m and 296 m, and the layer stops at the bottom of the main key layer of coarse sandstone. The overburden transport mainly goes through the stages of subsidence of the lower key layer, rapid subsidence of the upper sub-key layer, development of overburden movement towards the bottom of the main key layer of coarse sandstone, and transport of the main key layer. The separated layer position is proportional to the advancement distance of the working face, and the development of the separated layer is mainly divided into three stages, which are gestation (Ⅰ)-accelerated expansion (Ⅱ)- compression stage (Ⅲ).
- pattern of separation movement /
- distributed optical fiber /
- fixed-point optical fiber /
- PFC^2D /
- space of separated strata

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图 1 离层裂隙产生力学条件

Figure 1. Mechanical conditions of separated layer fracture

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图 2 分布式光纤应变监测曲线

Figure 2. Distributed fiber optic strain monitoring curves

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图 3 定点光纤应变监测曲线

Figure 3. Fixed point fiber optic strain monitoring curves

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图 4 PFC模拟的不同推进距离上覆岩层运动图

Figure 4. PFC simulation of overlying strata movement at different advance distances

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图 5 模型水平距离下覆岩沉降量

Figure 5. Settlement of overburden rock under horizontal distance of model

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图 6 不同推进距离下离层发育情况

Figure 6. Development of separation layer under different advancing distances

下载: 全尺寸图片幻灯片

表 1 模型地层细观参数表

Table 1 Mesoscopic parameters table of model strata

地层	分层颜色	编号	岩性	分层厚度/ m	弹性模量/ GPa	刚度比	法相黏聚力/ MPa	切向黏聚力/ MPa	密度/ （kg·m^-3）	内摩擦角/ （°）
志丹群		27	细砂岩	39.90	8.22	1.20	30.80	16.78	2 600	37
		26	中砂岩	38.04	5.57	1.02	34.61	18.31	2 630	32
		25	粗砂岩	42.76	5.00	1.05	35.45	18.63	2 550	33
		24	细砂岩	14.31	7.52	1.02	31.79	17.18	2 580	38
		23	粗砂岩	35.48	4.69	1.03	35.92	18.81	2 660	32
		22	中砂岩	14.10	10.71	1.15	27.35	15.33	2 620	36
		21	粗砂岩	13.61	6.68	1.03	33.00	17.67	2 590	32
安定组		20	泥岩	11.71	13.34	1.00	23.87	13.80	2 620	33
		19	粗砂岩	10.69	6.66	1.03	33.03	17.68	2 610	32
		18	泥质砂岩	8.09	10.03	1.09	28.28	15.72	2 610	34
		17	泥岩	24.00	24.01	1.09	11.44	7.59	2 690	34
		16	粗砂岩	17.14	7.56	1.02	31.74	17.16	2 590	34
		15	泥岩	14.86	24.01	1.09	11.44	7.59	2 690	34
直罗组		14	粉砂岩	29.60	17.61	1.03	18.57	11.31	2 740	25
		13	泥岩	8.73	17.87	1.00	18.26	11.16	2 700	33
		12	粉砂岩	16.23	27.88	1.03	7.61	5.33	2 660	25
		11	细砂岩	10.42	17.77	1.04	18.37	11.22	2 600	33
		10	粉砂岩	25.08	16.25	1.03	20.21	12.11	2 660	25
		9	细砂岩	10.15	16.43	1.03	19.99	12.00	2 600	33
		8	泥岩	15.10	23.04	1.07	12.45	8.15	2 700	31
延安组		7	中砂岩	16.30	21.10	1.06	14.55	9.28	2 590	36
		6	泥岩	6.90	32.88	1.30	3.19	2.41	2 700	36
		5	中砂岩	9.30	27.55	1.16	7.91	5.52	2 590	37
		4	粗砂岩	11.40	18.36	1.03	17.68	10.88	2 610	32
		3	中砂岩	9.30	11.11	1.02	26.80	15.09	2 590	34
		2	粉砂岩	11.10	25.29	1.12	10.12	6.83	2 780	36
			2-2煤	9.00	5.10	2.35	6.30	2.90	586	29
		1	粉砂岩	30.70	19.33	1.03	16.55	10.31	2 740	32

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