基于蠕变试验的浅埋空区群结构时变力学特性研究

doi:10.11872/j.issn.1005-2518.2018.04.511

Abstract

Abstract:

One of important factors that lead to ground and goaf collapse is the mechanical properties deterioration of shallow goaf group through time.Taking the shallow goaf group in Gumaling gold mine as an example，the creep model of the surrounding rock was obtained from rock creep test，and the time-variant mechanics properties of the shallow goaf group was analyzed by using numerical simulation method.The results show that the creep mechanical properties of the rock can be described by Cvisc model.After the goaf group is formed，the stress and displacement of ground rock mass and surrounding rock will change over time，showing significant time-variant mechanical characteristics.The roof displacement of the goaf group increases over time.The largest displacement is in the central goaf group，and the displacement is 0.24 m at the fifth year，indicating that the roof of goaf group will gradually collapse.The lateral deformation at two sides of pillar increases with time.Due to the surface failure of surrounding rock，the pillar continually narrows down，leading to the large-scale destruction of the goaf group.The ground forms a subsidence area centered on the central part of goaf group.The depth and extent of subsidence area increase with time，reaching 0.21 m at the fifth year. Some measures should be taken to protect the goaf group.

Key words: goaf group, time-varying mechanics, creep test, ground collapse, roof subsidence, pillar failure

CLC Number:

TD851

Zhongyuan GU,Keping ZHOU. Study on Time-Variant Mechanics Properties of Shallow Goaf Group Based on Creep Experiment[J].Gold Science and Technology, 2018, 26(4): 511-519.

Figures/Tables 13

Fig.1

Table 1

Table 2

Table 3

试件	$E M$ /GPa	$η M$ /（GPa·s）	$E K$ /GPa	$η K$ /（GPa·s）
平均值	4.52	4.07×10⁸	62.93	1.61×10³
A1	4.17	5.39×10⁸	62.45	1.58×10³
A2	4.51	2.16×10⁸	62.72	1.28×10³
A3	4.87	4.67×10⁸	63.61	1.98×10³

Table 3

Fig.2

Fig.3

Table 4

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蠕变应力/MPa	起始应变值/%	稳定应变值/%	蠕变应变/%
24.486	1.425	1.5638	0.1388
48.972	1.802	1.9019	0.0999
73.458	2.125	2.2678	0.1428
97.944	2.454	2.5043	0.0503
122.430	2.828	2.9168	0.0888

试件	高度/mm	直径/mm	蠕变抗压强度/MPa	蠕变系数
A1	99.43	49.52	123.521	0.841
A2	100.22	48.65	111.844	0.761
A3	99.78	48.79	119.249	0.812

材料	弹性模量/GPa	泊松比	内聚力/MPa	内摩擦角/(°)	抗拉强度/MPa
矿体	14.3	0.30	6.94	44.96	0.7
围岩	19.8	0.31	7.60	40	1.5

Study on Time-Variant Mechanics Properties of Shallow Goaf Group Based on Creep Experiment

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