第
32
卷第
5
期
2015
年
09
月
文章编号:
1673-3363-(2015)05-0760-05
采矿与安全工程学报
Journal
ofMining &
Safety
Engineering
谷拴成,丁潇
(西安科技大学建筑与土木工程学院,陕西
西安
710054)
Vo
1.3
2
No.5
Sep
t.
2015
摘要在煤矿巷道开挖过程中,巷道固岩变形不协调常常会产生顶板离层,围岩离层对锚杆加固
影响程度的分析直接影响支护工程的安全性。基于拉拔荷载作用下锚杆错固段的受力分布规律,
综合考虑端部锚固锚杆预紧力作用及离层产生的附加荷载,得出含有离层的系统锚杆受力分布形
式。结果表明:离层影响下,锚固体的轴力和界面剪应力均会增大,离层值过大时锚杆很容易失
效,产生安全隐患。最后将离层影响考虑到煤矿错固设计中,提出了新的巷道支护设计思路,通
过分析发现考虑离层后的承载力设计方法是安全合理。
关键词
顶板离层;端部锚固;预紧力;锚杆荷载;支护设计
中图分类号
TD353
文献标志码
A
DOI
10.13545/j.cnki.jmse
.2
015.05.0
1O
The analysis
of
end anchoring-grouting prestressed anchor loading
and support design with bed separation considered
GU
Shuancheng
, DING
Xiao
(School
of Architecture
and
Civil
Engineering
, Xi'an
University
ofScience
and
Technology
, Xi'an,
Shaanxi
710054
,
China)
Abstract
Roof
bed
separation often occurs due to the defollnation incoordination
of
surrounding
rock
in
the process
ofthe
excavation
ofmine
roadway.
Bed
separation has effect
on
the bolts,
and
the estima-
tion
of
the influence will directly affect the safety
of
support systems. The stress distributions
of
sys-
tematic bolt has
been
obtained, considering the pre-tightening force
of
end
anchoring-grouting bolt
and
the additional stress caused
by
roof
bed
separation. The results have shown that
under
the influence
of
roof
bed
separation, anchorage axial force
and
shear stress will all increase. An
chor
failure happens
easily
when
bed
separation value is too large, which will produce the potential safety hazard. Finally, the
effects
of
bed
separation have
been
taken into consideration in the bolting design,
and
a
new
bolt design
concept has
been
provided.
It
has
been
proved that the bearing capacity design
method
after considering
roofbed
separation is safer and more reasonable.
Key
words
roofbed
separation;
end
anchoring-grouting; prestress; bolt loading; supporting design
煤层与含煤地层是沉积形成的,呈层状埋藏
[1]
,
并且多受节理裂隙切割
[2]
。由于煤系地层沉积的分
收稿日期:
2013-12-01
层性和结构与岩性上的差异性,采动覆岩在弯曲沉
降过程中产生不同步,这种不同步弯曲沉降引起岩
基金项目
2
国家自然科学基金项目
(51508462);
陕西省教育厅科研项目
(20
13JK0961)
作者简介:谷拴成
(1963
一).男,陕西省宝鸡市人,博士,教授,主要从事岩土工程支护与加固方面的研究。
通信作者:丁潇
E-mail:
dx_0402@163.com
Tel:
029-85583153
第
32
卷第
5
期
2015
年
09
月
文章编号:
1673-3363-(2015)05-0760-05
采矿与安全工程学报
Journal
ofMining &
Safety
Engineering
谷拴成,丁潇
(西安科技大学建筑与土木工程学院,陕西
西安
710054)
Vo
1.3
2
No.5
Sep
t.
2015
摘要在煤矿巷道开挖过程中,巷道固岩变形不协调常常会产生顶板离层,围岩离层对锚杆加固
影响程度的分析直接影响支护工程的安全性。基于拉拔荷载作用下锚杆错固段的受力分布规律,
综合考虑端部锚固锚杆预紧力作用及离层产生的附加荷载,得出含有离层的系统锚杆受力分布形
式。结果表明:离层影响下,锚固体的轴力和界面剪应力均会增大,离层值过大时锚杆很容易失
效,产生安全隐患。最后将离层影响考虑到煤矿错固设计中,提出了新的巷道支护设计思路,通
过分析发现考虑离层后的承载力设计方法是安全合理。
关键词
顶板离层;端部锚固;预紧力;锚杆荷载;支护设计
中图分类号
TD353
文献标志码
A
DOI
10.13545/j.cnki.jmse
.2
015.05.0
1O
The analysis
of
end anchoring-grouting prestressed anchor loading
and support design with bed separation considered
GU
Shuancheng
, DING
Xiao
(School
of Architecture
and
Civil
Engineering
, Xi'an
University
ofScience
and
Technology
, Xi'an,
Shaanxi
710054
,
China)
Abstract
Roof
bed
separation often occurs due to the defollnation incoordination
of
surrounding
rock
in
the process
ofthe
excavation
ofmine
roadway.
Bed
separation has effect
on
the bolts,
and
the estima-
tion
of
the influence will directly affect the safety
of
support systems. The stress distributions
of
sys-
tematic bolt has
been
obtained, considering the pre-tightening force
of
end
anchoring-grouting bolt
and
the additional stress caused
by
roof
bed
separation. The results have shown that
under
the influence
of
roof
bed
separation, anchorage axial force
and
shear stress will all increase. An
chor
failure happens
easily
when
bed
separation value is too large, which will produce the potential safety hazard. Finally, the
effects
of
bed
separation have
been
taken into consideration in the bolting design,
and
a
new
bolt design
concept has
been
provided.
It
has
been
proved that the bearing capacity design
method
after considering
roofbed
separation is safer and more reasonable.
Key
words
roofbed
separation;
end
anchoring-grouting; prestress; bolt loading; supporting design
煤层与含煤地层是沉积形成的,呈层状埋藏
[1]
,
并且多受节理裂隙切割
[2]
。由于煤系地层沉积的分
收稿日期:
2013-12-01
层性和结构与岩性上的差异性,采动覆岩在弯曲沉
降过程中产生不同步,这种不同步弯曲沉降引起岩
基金项目
2
国家自然科学基金项目
(51508462);
陕西省教育厅科研项目
(20
13JK0961)
作者简介:谷拴成
(1963
一).男,陕西省宝鸡市人,博士,教授,主要从事岩土工程支护与加固方面的研究。
通信作者:丁潇
E-mail:
dx_0402@163.com
Tel:
029-85583153