湖南宁乡大成桥地区岩溶地面塌陷分布特征及影响因素分析

湖南宁乡大成桥地区至2012年产生岩溶地面塌陷484处。文章通过对地质环境条件及岩溶地面塌陷时空分布特征的分析,总结出本区岩溶地面塌陷的分布特征和影响因素：（1）岩溶发育区发生塌陷428处,占总数的88.5%;冲沟地形中发生岩溶地面塌陷339处,占70%;覆盖层厚度小于10 m区发生塌陷335处,占总数的69.2%;双层结构区发生塌陷266处,占总数的55%,分布密度为7.82处/km2;冲洪积成因土体产生塌陷404处,残积土中产生塌陷80处;（2）岩溶地面塌陷在雨季的4-7月发生281处,占总数的58%;2001-2006年平均每年产生塌陷20处,2007-2012年平均每年产生塌陷54处,...

Full description

Saved in:
Bibliographic Details
Published in中国岩溶 Vol. 33; no. 4; pp. 490 - 497
Main Author 陈亮晶 孙锡良 皮景 王璨 欧健
Format Journal Article
LanguageChinese
Published 湖南省地质矿产勘查开发局402 队,湖南 长沙,410014 2014
Subjects
分布特征
岩溶地面塌陷
影响因素
湖南宁乡
influencing factors
岩溶地面塌陷
distribution characteristics
Ningxiang Hunan
影响因素
karst collapse
分布特征
湖南宁乡
Online AccessGet full text
ISSN1001-4810
DOI10.11932/karst20140414

Cover

More Information
Summary:湖南宁乡大成桥地区至2012年产生岩溶地面塌陷484处。文章通过对地质环境条件及岩溶地面塌陷时空分布特征的分析,总结出本区岩溶地面塌陷的分布特征和影响因素：（1）岩溶发育区发生塌陷428处,占总数的88.5%;冲沟地形中发生岩溶地面塌陷339处,占70%;覆盖层厚度小于10 m区发生塌陷335处,占总数的69.2%;双层结构区发生塌陷266处,占总数的55%,分布密度为7.82处/km2;冲洪积成因土体产生塌陷404处,残积土中产生塌陷80处;（2）岩溶地面塌陷在雨季的4-7月发生281处,占总数的58%;2001-2006年平均每年产生塌陷20处,2007-2012年平均每年产生塌陷54处,逐年增加趋势明显;（3）484处岩溶地面塌陷全部分布在煤炭坝疏干排水形成的降落漏斗范围之内;（4）本区地质环境极为脆弱：岩溶发育,覆盖层厚度较薄、力学性质差且双层结构土广泛分布于冲沟及冲积平原,是产生塌陷的内在因素;矿区疏干排水是主要诱发因素,降雨分布不均、地表水渗漏及河道整治对塌陷产生起促进作用。
Bibliography:karst collapse; distribution characteristics; influencing factors; Ningxiang Hunan
CHEN Liang-jing,SUN Xi-liang,PI Jing,WANG Can,OU Jian （402 Geological Prospecting Party Hunan, Changsha, Hunan 410014, China）
45-1157/P
In the past few years,484 karst collapses with a total collapse area of over 300km2 have occurred in the Dachengqiao area of Ningxiang county.They caused direct economic losses of more than 1billion RMB and they have generally been increasing in number.Dachengqiao is located in the transition zone between the hills of Hunan and the Dongting lacustrine plain.The area＇s geomorphology is mainly hills,with a few gullies and the Weishui alluvial plains;the local strata are mainly Permian,Cretaceous and Quaternary with scattered Carboniferous outcrops.Basic data about the collapses and their current status was obtained through data collection,field investigation,geophysical prospecting,drilling,pumping tests,long time observation,and groundwater level measurement.The environmental and geological conditi
ISSN:1001-4810
DOI:10.11932/karst20140414