金川二矿区地应力特征及其对巷道变形破坏的影响研究

doi:10.11872/j.issn.1005-2518.2021.06.120

Abstract

Abstract:

With the development of underground engineering construction to the deeper earth，high ground stress has become a key factor affecting the stability of deep roadway surrounding rock.Under the action of high in-situ stress，the mechanical behavior characteristics and microstructure of deep rock mass change significantly compared with shallow rock mass，which is the cause of frequent mining accidents in deep underground engineering，and also the research focus in the field of rock mechanics.Taking Jinchuan No.2 mining area，a typical high in-situ stress mining area，as the background，this paper summarizes the in-situ stress distribution characteristics of the study area according to the previous measured data.On this basis，the discrete element numerical simulation method was used to calibrate the rock mechanical parameters based on the laboratory test of rock samples in the study area，and the tunnel models under three different in-situ stress conditions were established.According to the simulation results，the development process of roadway surrounding rock deformation under different conditions was described，the deformation failure characteristics of roadway in each model were compared，the influence of ground stress on roadway deformation failure was analyzed，and the corresponding control methods were proposed.The main conclusions of the study include：（1）Due to the influence of complex geological background，the distribution of ground stress in Jinchuan No.2 mining area is highly discrete.In the measured data，there are more than 80% of the measure points show that maximum horizontal principal stress is greater than the vertical principal stress，and the stress of primary rock is mostly horizontal.In shallow mining areas，the growth rate of horizontal stress is greater than that of vertical stress.With the increase of buried depth，the increment speed of horizontal stress gradually decreases，and the vertical principal stress gradually approaches the maximum horizontal principal stress.（2）Without the influence of structural planes，the deformation mode of homogeneous surrounding rock roadway is mainly roof subsidence and floor heave，and the deformation is mainly dependent on plastic flow.With the continuous increasing of in-situ stress，the total deformation and deformation velocity of roadway are increasing.Ground stress does not change the deformation mode of roadway surrounding rock，but intensifies its failure degree.（3）When roadway excavation is carried out under geological conditions dominated by horizontal ground stress，support of roof and floor should be adopted to maintain the overall stability of roadway.In addition，because of the significant time effect of plastic deformation，the cracking caused by the compression of roadway lining also has a certain lag.Thus，the deformation of roadway should be regularly monitored in the construction in case of the dangerous deformation.The research results can provide theoretical reference for safe and efficient deep mining in Jinchuan No.2 mining area.

Key words: Jinchuan copper-nickel mine, high in-situ stress, deep roadway, deformation failure, PFC, supporting measure

CLC Number:

TD353

Guang LI,Fengshan MA,Jie GUO,Long ZOU,Yongyuan KOU. Study on Ground Stress Characteristics and Its Influence on Roadway De-formation Failure in Jinchuan No.2 Mining Area[J].Gold Science and Technology, 2021, 29(6): 817-825.

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编号	深度/m	σ_H/MPa	σ_h/MPa	σ_v/MPa	k
1	20	2.4	2.3	0.54	4.444444
2	44	4.2	3.5	1.19	3.529412
3	120	7.8	3.1	3.24	2.407407
4	240	15.2	14.6	6.48	2.345679
5	375	18.7	22.2	12.42	1.95459
6	460	24.5	13.3	12.96	1.505636
7	480	24.5	15.4	12.96	1.890432
8	480	21	13.2	18.6	1.129032
9	550	19.8	10.8	10.13	1.890432
10	570	26.7	12.4	18.6	1.435484
11	730	17.3	11.5	20.4	0.848039
12	730	22.4	6.4	15.1	1.483444
13	730	20.7	11.9	16.1	1.471591
14	730	19.9	11.6	16.4	1.285714
15	730	20.2	11.9	16.9	1.213415
16	740	19.9	7.4	18.5	1.195266
17	740	25.3	7.1	15.9	1.075676
18	750	25.9	10.8	17.6	1.591195
19	755	24.5	9.2	17.3	1.416185
20	780	20.2	13.1	22.5	0.897778
21	780	28.1	12.9	25.4	1.106299
22	790	26.2	15.6	22.5	1.164444
23	810	22.4	14.3	26.6	0.842105
24	816	25.5	6.7	22.9	1.113537
25	820	21.4	20.8	24.2	0.884298
26	938	37.1	36.4	26.9	1.379182
27	970	25.5	23.9	31.6	0.806962
28	970	22.2	9.3	29.7	0.747475
29	970	37.5	13.2	27.3	1.373626
30	970	34.5	14.2	24.2	1.42562
31	975	39.3	31.4	28.9	1.359862

材料	变量参数	数值	材料	变量参数	数值
颗粒	密度/（kg·m^-3）	2500	胶结物	弹性模量/GPa	20
	最小半径/mm	60		刚度比	1
	粒径比	1.67		抗拉强度/MPa	20
	孔隙率	0.1		黏聚力/MPa	20
	弹性模量/GPa	20		摩擦角/（°）	25
	刚度比	2		黏结半径系数	1.5
	摩擦系数	0.5

深度/m	水平地应力/MPa	竖直地应力/MPa	k
550	19.80	10.13	1.890432
750	25.90	17.60	1.591195
1 000	39.30	28.90	1.359862

Study on Ground Stress Characteristics and Its Influence on Roadway De-formation Failure in Jinchuan No.2 Mining Area

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