第23卷第22期
岩石力学与工程学报
23(22):3884~3890
2004年I 1月
Chinese Journal
ofRock
Mechanics
and Engineering
Nov.,2004
木架山采空区处理方案研究木
李俊平1彭作为1周创兵1孔建1盛永清1卢忠瑜2陈克钧2
(‘武汉大学水资源与水电工程科学国家重点实验室武汉430072)(2湖北荆襄化工集团有限责任公司
钟祥431910)
摘要木架山地表允许发生岩体移动和沉陷。由于非法开采,在井下形成了375 000m2的采空区。为了避免冲击地
压隐患,防止非法开采,必须崩塌上部采空区。提出用切顶与矿柱崩落法处理木架山采空区。应用ANSYS三维有
限元程序,研究了极限跨度、悬臂状态下的极限跨度和切顶深度,分析了采空区处理对后续开采的影响。结论表
明,覆岩较薄时,矿柱布置的变化必然引起采动应力的整体变化:应用102 m的极限跨度或76.5 m的悬臂极限跨度
和8~ll m的切顶垂直深度,可确保白云岩顶板自然塌落;采空区处理不会影响后续安全生产。在吼,y确定的情
况下,Ⅳ与计算部位的实际值差别越大,公式,=1.25Ⅳ【吼/(yH)+0.001
2七】06的计算误差也越大。
关键词采矿工程,采空区处理,有限元,切顶,矿柱崩落
分类号TD
853.391
文献标识码A
文章编号1000.6915(2004)22-3884.07
STUDY oN
SCHEMES
FoR DISPOSING ABANDONED
SToPE IN
MUJIA
HILL
Li Junpin91,Peng Zuoweil,Zhou Chuangbin91,Kong Jianl,Sheng Yongqingl,
Lu Zhongyu2,Chen
Kejun2
(iState
Key Laboratory
of
Water
Resources
and Hydropower Engineering Science,
Wuhan UniversiO,,
Wuhan
430072
China)
(2HubeiJingxiang Chemical(Group)Co.Ltd.,Zhongxiang
431910
China)
Abstract
Surface subsidence and rock movement is
allowed
in
Mujia
Hill.And
375 000 m2 continuous
and
gently inclined abandoned stopes were formed underground because of illegal
mining.To
prevent the potential
danger of
air
shock
wave
resulted from sudden caving of roof
and
illegal mining,the abandoned
stope
of upside
must
be
dilapidated.The method disposing abandoned
stope is
summarized,and
it is
proposed
that the
abandoned
stope
be
disposed by roof cutting and
pillar
dilapidation.The
3D
non—linear
FEM
code ANSYS is applied.The
minimal roof span,the minimal cantilever
roof
span and roof cutting depth
are
studied by the 3D
FEM.And
then
the
influence of the disposing of abandoned stope
on
subsequent mine is
analyzed.The results show that the
diversification of pillar distribution necessarily results in whole change of excavming stress when the
cover
terrane
thickness is thinner.If the minimal roof span of 1 02 m
long
or
the
minimal cantilever roof
span
of 76.5 m long and
roof
cutting of
8“1
1 m
vertical.deep
are adopted,uncontrolled collapse
of dolomite
roof
call
be
ensured.
Subsequently,mining safety will
not
be
affected
by disposing abandoned
stope.With吼,y
known,the
bigger the
difference between
H and
covedng
thickness
of field rock-mass is,the
bigger
the
error
calculated by
the
formula
,=1.25H【cr。/(rH)+O.00
1
2k]“o
is.
Key words
mining
engineering,abandoned
stope disposal,finite
element,roofcutting,pillar
dilapidation
2004年1月12日收到初稿,2004年3月8日收到修改稿。
・国家自然科学基金(50239070)资助课题。
作者李设平简介:男,1969年生,博士,1991年毕业于西安建筑科技大学采矿专业,现在武汉大学水利工程博士后流动站从事岩土工程方面的研
究工作.E-maih junpingli@163.corn。
万方数据