加筋尾矿稳定性及界面剪切模型

doi:10.16265/j.cnki.issn1003-3033.2022.04.013

中国安全科学学报 ›› 2022, Vol. 32 ›› Issue (4): 86-92.doi: 10.16265/j.cnki.issn1003-3033.2022.04.013

加筋尾矿稳定性及界面剪切模型

金洪松¹(), 易富², 戚旭鹏¹, 于汇泽³, 杜常博¹, 于犇¹

¹ 辽宁工程技术大学土木工程学院,辽宁阜新 123009
² 辽宁工程技术大学建筑与交通学院,辽宁阜新 123009
³ 长春高新建设开发有限公司,吉林长春 130102

收稿日期:2022-01-17 修回日期:2022-03-25 出版日期:2022-04-28
作者简介:
金洪松 (1993—),男,吉林榆树人,硕士,主要从事环境岩土工程及能源岩土方面的研究。E-mail: 1426819172@qq.com。
易富, 教授。
于汇泽, 高级工程师。
基金资助:
国家自然科学基金资助(51774163); 辽宁工程技术大学首批“双一流”学科建设创新团队项目(LNTU20TD-26)

Research on slip stability and interface shear model of reinforced tailings slope

JIN Hongsong¹(), YI Fu², QI Xupeng¹, YU Huize³, DU Changbo¹, YU Ben¹

¹ School of Civil Engineering, Liaoning Technical University, Fuxin Liaoning 123009, China
² School of Architecture and Transportation, Liaoning Technical University, Fuxin Liaoning 123009, China
³ Changchun High New Technology Building Development Inc, Changchun Jilin 130102, China

Received:2022-01-17 Revised:2022-03-25 Published:2022-04-28

摘要/Abstract

摘要：

为分析加筋尾矿坝的边坡抗滑移稳定性,探讨上覆荷载和尾矿砂含水率对加筋尾矿界面初始剪切刚度的影响,采用土工合成材料直剪拉拔试验摩擦系统,对加筋尾矿开展直剪试验并建立剪切模型,通过拟合试验结果求得初始剪切刚度值。结果表明:在加筋尾矿直剪试验过程中,剪切应力达到峰值后会略有降低;新剪切模型计算出的试验结果接近实际值,初始剪切刚度值误差在1 kPa以内,优于常规剪切模型;随着含水率的增加,初始剪切刚度先增大到峰值,后逐渐减小。当上覆荷载增加到一定值时,初始抗剪刚度将保持稳定。依据试验结果,可求出各组试验的最大初始剪切刚度值,从而判断尾矿坝是否稳定。

关键词: 加筋尾矿, 边坡滑移稳定性, 界面剪切模型, 土工格栅, 直剪试验, 初始剪切刚度

Abstract:

In order to analyze slope-sliding stability of reinforced tailings dams and explore influence of overlying load and tailings water content on initial shear stiffness of reinforced tailings interfaces, direct shear test on such tailings was conducted and a shear model was established by using geosynthetics direct shear pull-out test friction system. Then, initial shear stiffness value was obtained by fitting the test results. The results show that during the test, shear stress will decrease slightly after reaching peak value. The outcomes calculated by new shear model are close to the actual value, and the error of initial shear stiffness is less than 1 kPa, which is better than the conventional model. With the increase of water content, the stiffness first increases to the peak value and then decreases gradually. However, as overlying load increases to a certain value, it will be stable. Moreover, the maximum initial shear stiffness of each group can be obtained, which can judge whether the tailings dam is stable or not.

Key words: reinforced tailings, slope sliding stability, interface shear model, geogrid, direct shear test, initial shear stiffness

金洪松, 易富, 戚旭鹏, 于汇泽, 杜常博, 于犇. 加筋尾矿稳定性及界面剪切模型[J]. 中国安全科学学报, 2022, 32(4): 86-92.

JIN Hongsong, YI Fu, QI Xupeng, YU Huize, DU Changbo, YU Ben. Research on slip stability and interface shear model of reinforced tailings slope[J]. China Safety Science Journal, 2022, 32(4): 86-92.

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土工格栅力学参数		性能指标
网格尺寸(长×宽)/(mm×mm)		12.7×12.7
断裂强度/(kN·m^-1)	径向	30
断裂强度/(kN·m^-1)	纬向	30
断裂伸长率/%	径向	4
断裂伸长率/%	纬向	4
耐温性/℃		-100~280

试验号	实际峰值剪切应力	界面剪切模型-指数模型		界面剪切模型-双曲线模型		新剪切模型
试验号	实际峰值剪切应力	拟合峰值剪切应力	相对误差	拟合峰值剪切应力	相对误差	拟合峰值剪切应力	相对误差
1	15.87	16.17	0.30	21.00	5.14	15.16	0.71
2	30.61	31.46	0.85	40.98	10.37	29.66	0.95
3	45.48	47.78	2.30	62.42	16.94	44.51	0.97
4	57.02	60.74	3.72	81.69	24.66	56.47	0.55
5	16.61	16.68	0.07	21.58	4.97	16.00	0.61
6	32.98	33.06	0.08	41.70	8.72	32.56	0.42
7	47.19	48.08	0.89	61.81	14.62	46.21	0.98
8	59.81	62.97	3.16	83.47	23.66	59.44	0.37
9	16.54	15.93	0.61	19.50	2.95	15.77	0.78
10	32.92	32.81	0.11	41.68	8.76	32.86	0.07
11	46.39	48.59	2.20	64.19	17.80	46.36	0.03
12	54.58	58.00	3.43	77.24	22.67	53.93	0.65
13	16.47	17.01	0.55	22.73	6.26	15.85	0.62
14	28.78	30.09	1.31	39.68	10.90	27.95	0.83
15	38.10	40.80	2.70	53.76	15.66	37.82	0.28
16	49.52	52.51	2.99	70.08	20.56	48.53	0.10

试验号	上覆荷载/kPa	含水率/%	a₃	b₃	实际峰值剪切应力/kPa	拟合峰值剪切应力/kPa	相对误差/kPa	初始剪切刚度k_3,0/ (kPa·mm^-1)
1	25	3	1.85	0.05	15.87	15.16	0.71	1.85
2	50	3	3.63	0.05	30.61	29.66	0.95	3.63
3	75	3	5.57	0.05	45.48	44.51	0.97	5.57
4	100	3	6.60	0.04	57.02	56.47	0.55	6.60
5	25	7	2.00	0.05	16.61	16.00	0.61	2.00
6	50	7	4.16	0.05	32.98	32.56	0.42	4.16
7	75	7	5.90	0.05	47.19	46.21	0.98	5.90
8	100	7	7.11	0.04	59.81	59.44	0.37	7.11
9	25	11	1.84	0.04	16.54	15.77	0.78	1.84
10	50	11	4.11	0.05	32.92	32.86	0.07	4.11
11	75	11	5.54	0.04	46.39	46.36	0.03	5.54
12	100	11	6.45	0.04	54.58	53.93	0.65	6.45
13	25	15	1.81	0.04	16.47	15.85	0.62	1.81
14	50	15	3.34	0.04	28.78	27.95	0.83	3.34
15	75	15	5.04	0.05	38.10	37.82	0.28	5.04
16	100	15	6.07	0.05	49.52	48.53	0.10	6.07

含水率/%	A	B	C	达到极值时荷载/kPa	最大初始剪切刚度/(kPa·mm^-1)
3	-0.56	0.10	-2.96×10^-4	172.53	8.24
7	-0.66	0.12	-3.81×10^-4	152.31	8.17
11	-1.03	0.13	-5.44×10^-4	118.65	6.63
15	-0.18	0.08	-2.02×10^-4	205.85	8.36

加筋尾矿稳定性及界面剪切模型

Research on slip stability and interface shear model of reinforced tailings slope

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