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讨论金属矿山地面沉陷 [复制链接]

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离线zyep

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只看该作者 12楼 发表于: 2008-04-14
我来这里只有学习的份。
离线wateryou

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只看该作者 13楼 发表于: 2008-04-17
There are six types of common failure mechanisms of shallow stopes of hard rock mines: !cX[-}Q  
•    rock fracturing: YK#fa2ng  
Rupture of the surface crown pillar and collapse into the shallow stope. m_NCx]#e   
•    plug failure: X` YwP/D  
Sudden fall of the surface crown pillar, delineated by its boundary planes, by gravity into the shallow stope. The planes are well-defined, with near to vertically dipping uninterrupted discontinuities with low shear strength. The pillar thickness can vary; plugs up to 660 m high have occurred [Allen, 1934]. 0Q9T3X  
Failure potential depends considerably on the confinement available from redistributed stresses around the stope to resist movement; areas of numerous regional shallow stopes are prime candidates for plug failures. w Iv o"|%  
Rarely do visual precursor movements occur, although smaller scale movements do open discontinuities and allow for water flow. Failure occurs suddenly and completely as a block. 1R%1h9I4'  
•    ravelling: 6sfwlT  
Peripheral block by block rock mass failure without a self-support cavity form reached which includes delamination), ravelling failure involving sliding or buckling of thin rock layers at stope boundaries leading to the deStabilization of the surface crown pillar. $7Jo8^RE  
Gradual failure from an unsupported periphery of unfavorably oriented rock blocks, or those where discontinuity orientations are relatively shallow, is commonplace when the span exceeds self-support capabilities, but very low peripheral compressive stresses are required to keep blocks in place [Bétournay, 1995]. kAYb!h[`  
Blocks fail without the remainder of the rock mass mobilizing on a large scale unless a stable self-supported arch cavity is formed. 2'0K WYM  
•    strata failure: e&<yX  
Tensile failure of stratified rock at wall contacts or along the surface crown pillar span. Rd*[%)  
Few case studies of vertically progressing delaminations have reached surface. The poor cross-jointing normally shown by the rock masses make the strata stiffer and limits failure heights to shallow domes. In other cases, massive block failures have occurred when pillars fail in room and pillar mining. Such failures quickly choke off because of high bulking factors. eDKxn8+(H  
•    chimneying disintegration: g{k1&|  
The upward progression of disintegration within a weak rock mass forming a cavity with limited lateral extent (<5 m), developing from an underground opening toward surface. This condition is similar to that described for roadway intersections in room and pillar coal mining. .x83Ah`  
Failures (self-driving, and continuous if failed material is removed) normally progress upward in thick weak geological units (with low cohesion that can be sheared easily), but will continue up-dip when stronger units are encountered [Bétournay, 1998]. Equations 4 and 5 can be used respectively to evaluate the possible initiation of the failure mechanism and its maximum height. The bulking factor for weak rock units which host this failure mechanism in hard rock mines (e.g.schists, altered rock) is 1.05<k<1.2. %r{3wH# D@  
Ground support is only marginally effective in providing anchoring and global peripheral integrity. *~XA'Vw!  
•    rock mass caving: Rock mass break-up and gravity mobilization of blocks (flow) towards and into an opening leading to a progressive failure front moving towards surface. C@\{ehG  
Although the initiation of rock mass caving can begin with block ravelling, the mechanical action involved in breaking and mobilizing the rock mass (Figure 29) is difficult to quantify or predict with accuracy. Rock masses with blocks of similar shapes, smaller sizes with low surface friction, and shallow angle discontinuities are likely in areas of low confining stresses to block cave. These and many other factors readily make it difficult for a rock mass to breakdown during and after mining extraction. S^I,Iz+`S'  
The dimensions of the problem, along with surface effects have been defined by Janelid and Kvapil (1966) based on silo studies. The volume that has caved into a stope is defined by the draw ellipsoid. The limit ellipsoid contains the zone of broken material that has subsequently moved and expanded under gravity to fill this volume. If the draw ellipsoid intersects surface, complete failure of the rock mass in the surface crown pillar is registered
离线pendingboy

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只看该作者 14楼 发表于: 2008-04-21
真是太棒了,我找了很久的资料!!!谢谢楼主分享,很实用的资料!!!!下一次就顶一次!!!!!! 72 TI  
真是太棒了,我找了很久的资料!!!谢谢楼主分享,很实用的资料!!!!下一次就顶一次!!!!!!  "R #k~R  
真是太棒了,我找了很久的资料!!!谢谢楼主分享,很实用的资料!!!!下一次就顶一次!!!!!!      Q'B6^%:<~  
真是太棒了,我找了很久的资料!!!谢谢楼主分享,很实用的资料!!!!下一次就顶一次!!!!!!                
孔子曰:打架用砖乎,照脸乎,不宜乱乎;乎不着再乎,乎着往死里乎;
离线huangtian

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只看该作者 15楼 发表于: 2008-04-26
真是好东西啊,现在正需要这方面的资料,万分感谢!
离线liuzw12

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只看该作者 16楼 发表于: 2008-04-26
   
做岩土人,干岩土事,发岩土帖,人人为我,我为人人!
离线罗镇红
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只看该作者 17楼 发表于: 2008-04-28
我想找个土力学专业的人,翻译这个专业的资料,英译汉,有意者致电13601318225
离线yazhao
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只看该作者 18楼 发表于: 2008-05-01
本人希望得到有关矿井设计的资料 %98' @$:0  
望给一点建议
离线ltz888

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只看该作者 19楼 发表于: 2008-05-02
谢谢楼主分享
离线librascopio

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只看该作者 20楼 发表于: 2008-05-07
我们是做环境影响评价的,以前作过煤矿开采地表沉陷的半定量预测,对于金属矿山的都是定性的分析,结果现在遇到一个铝土矿的项目,评审专家要求进行地表沉陷定量预测,崩溃ING~
离线晚枫1977
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只看该作者 21楼 发表于: 2008-05-09
非常感谢,学习一下哈,还没有发言权
离线yuqingk

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只看该作者 22楼 发表于: 2008-05-12
支持一下~我现在也在做个铅锌矿采空区治理
离线sunston

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只看该作者 23楼 发表于: 2008-05-13
地表沉陷与岩体赋存状况、采矿方法等密切相关,地表沉陷应当首先从岩石力学开始,但这个岩石力学应当是 [ Fz`D/  
在现有岩石力学基础上有本质提升的力学理论,现在岩石力学的研究方法与思路已经完全阻碍了矿山岩石力学的 @/1w4'M  
发展,究竟怎么深入还有待探讨!
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