| 三峡移民安置区泥灰质岩岩溶风化灾变性分析 |
| |
| 引用本文： | 张加桂.三峡移民安置区泥灰质岩岩溶风化灾变性分析[J].中国岩溶,2005,24(3):239-244. |
| |
| 作者姓名： | 张加桂 |
| |
| 作者单位： | 中国地质科学院地质力学研究所,北京,100081;中国地质环境监测院,北京,100081 |
| |
| 基金项目： | 三峡移民开发局资助项目 |
| |
| 摘 要： | 三峡移民安置区三叠系巴东组(T2b)泥灰质岩的岩溶风化问题是新近发现的重大工程地质问题.泥灰质岩具有灰岩和泥岩双重特性,在灰质成分遭受溶蚀的同时,泥质成分遭受风化,由此引起岩性的复杂变化,由室内测试得出,深灰色泥质灰岩经岩溶风化后,CaCO3含量呈降低的趋势,Fe2O3含量和蒙脱石含量增高,演变为一系列风化岩和残坡积土,包括灰绿色泥灰岩、黄绿色泥灰岩、粉红色钙质泥岩、棕红色钙质泥岩、棕红色泥砾层、黄褐色膨胀土,在深处地下水富集带,泥灰质岩则被溶蚀成为杏黄色泥质条带.随着岩性的变化,岩石的力学强度不断降低、完整性不断弱化,并可能产生普遍的地面不均匀沉降、地裂缝、滑坡、崩塌、泥石流及地面塌陷地质灾害,这些问题必须在移民迁建以及将来城镇运行过程中引起高度重视.
|
| 关 键 词： | 岩溶 风化 地质灾害 泥灰质岩 三叠系巴东组 三峡移民安置区 |
| 文章编号： | 1001-4810（2005）03-0239-06 |
| 收稿时间： | 2004-11-08 |
| 修稿时间： | 2004年11月8日 |
ANALYSIS ON CATASTROPH BY KARST WEATHERING OF MARLY LIMESTONE IN POPULATION RESETTLEMENT REGION OF THE THREE GORGES |
| |
| ZHANG Jia-gui.ANALYSIS ON CATASTROPH BY KARST WEATHERING OF MARLY LIMESTONE IN POPULATION RESETTLEMENT REGION OF THE THREE GORGES[J].Carsologica Sinica,2005,24(3):239-244. |
| |
| Authors: | ZHANG Jia-gui |
| |
| Institution: | 1.Institute of Geomechanics,Chinese Academy of Geological Sciences 2.China Institute of Geo-Environmental Monitoring |
| |
| Abstract: | The weathering of marly limestone of the middle Triassic Badong formation(T_2b) in the population resettlement region of Three Gorges is an important engineering geological problem newly discovered.Marly limestone bears both properties of limestone & mudstone.By field observation,it can be known while the CaCO_3 in marly limestones being dissolved,the mud content weathered,which put forward the complex variation of content of marly limestones.By lab test,it is proved that after weathering the CaCO_3 decreases and the Fe_2O_3 increases, which gives out a series of weathering rocks and residual soils,including celadon or kelly marl,pink lime mudstone,brown red lime mudstone,brown red mud gravel deposit,and yellow brown expansive soil.Along the water-flowing aquifer,marly limestone becomes apricot argillaceous zone.With the variation of the chemical contents,the mechanical intensity of marly limestone gradually drops and integrality weakens.Furthermore,there might vastly occur geo-hazards such as uneven subsidence,fissure,landslide,collapse,mud flow and cave-in,which should be paid great attention to in the process of population resettlement and the future town operation. |
| |
| Keywords: | Karst Weathering Geo-hazard Marly limestones Middle Triassic Badong formation(T_2b) Population resettlement region of the Three Gorges |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《中国岩溶》浏览原始摘要信息 |
| 点击此处可从《中国岩溶》下载免费的PDF全文 |
|
