滇西芒棒盆地芒棒组碳质粉砂岩的工程地质特性

J4 ›› 2012, Vol. 42 ›› Issue (4): 1090-1098.

滇西芒棒盆地芒棒组碳质粉砂岩的工程地质特性

郭长宝^{1, 2}|李海华²|陈溪华³|和勇³|歹家文³|张能³

1.中国地质科学院地质力学研究所|北京100081;
2.成都理工大学地质灾害防治与地质环境保护国家重点实验室|成都610500;
3.云南地质工程第二勘察院|昆明650050

收稿日期:2011-10-06 出版日期:2012-07-26 发布日期:2012-07-26
作者简介:郭长宝(1980-)|男|工程师|博士|主要从事工程地质与地质灾害方面的研究工作|E-mail:guochangbao@163.com
基金资助:
国家自然科学基金项目（41072269）；“十二·五”科技支撑计划课题（2012BAK10B02）；铁道部科技研究开发计划项目（2008G027-B）；地质灾害防治与地质环境保护国家重点实验室开放基金项目（SKLGP2010K015）

Engineering Geology Characteristic of the Carbonaceous Siltstone in Mangbang Basin, West of Yunnan Province

Guo Chang-bao^1,2,Li Hai-hua²,Chen Xi-hua³,He Yong³,Dai Jia-wen³,Zhang Neng³

1.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing100081|China;
2.State Key Laboratory of Geological Hazard Prevention &|Geological Environment Protection, Chengdu University of Technology|Chengdu610500|China;
3.Yunnan Geological Engineering the Seoond Investigation Institute, Kunming650218|China

Received:2011-10-06 Online:2012-07-26 Published:2012-07-26

摘要/Abstract

摘要：

滇西芒棒盆地是在上新世喜山运动后期高黎贡山强烈隆升过程中形成的近SN向的断陷盆地，在盆地内发育芒棒组碳质粉砂岩等半成岩，规划建设中的中缅公路保山—腾冲高速公路段从该套地层中通过。野外调查发现：该套碳质粉砂岩具有成岩差、易崩解、结构性强等特性，容易引发边坡失稳、隧洞围岩冒顶等工程地质问题。室内试验测试表明：该类岩石具有天然含水量高、孔隙度大、低膨胀性和有机质含量高等特点。由于有机质的胶结作用，天然岩体和干燥岩块浸水后的性状显著不同，岩体干燥后具有水稳性增强和膨胀势降低的特性。结合典型工程实例，开展了原位直接剪切试验。试验结果表明:碳质粉砂岩具有抗剪强度较高、峰残降差小等特点，是该类地层中大型不稳定斜坡体和蠕滑型滑坡发育的主要因素之一。

关键词: 芒棒组, 碳质粉砂岩, 半成岩, 工程地质

Abstract:

Mangbang basin is a SN directed fault depression basin which was shaped when Gaoligong Mountains intensely upheaved at the end of Himalayan movement in Pliocene period, where carbonaceous siltstone of Mangbang group, a kind of soft half-diagenesis rock, is well distributed. The Baoshan-Tengchong high way section of Burma Road will pass through this basin. Field geology survey indicates that this kind of carbonaceous siltstone is characterized by weak diagenesis, easy disintegration and strong structural strength, which can cause the engineering geological problems of slope failure and roof fall of surrounding rock in tunnel. Laboratory test results show a high natural water content, high porosity, low expansibility and high organic content of it. Due to organic cementation, striking difference can be obtained in the engineering properties of natural rock and dry rock after immersion in water, which indicates the enhancement in water stability and reduction in swelling potential of dried rock. Based on typical project example, in-situ shearing test was conducted on the carbonaceous siltstone, and the results indicate that it has the characteristics of high shear strength and little difference between peak and residual strength, which is one of the main factors for the development of large unstable slope body and creeping landslide in this kind of rock stratum.

Key words: Mangbang group, carbonaceous siltstone, half-diagenesis rock, engineering geology

中图分类号:

P642.2

郭长宝, 李海华, 陈溪华, 和勇, 歹家文, 张能. 滇西芒棒盆地芒棒组碳质粉砂岩的工程地质特性[J]. J4, 2012, 42(4): 1090-1098.

GUO Chang-bao, LI Hai-hua, CHEN Xi-hua, HE Yong, DAI Jia-wen, ZHANG Neng. Engineering Geology Characteristic of the Carbonaceous Siltstone in Mangbang Basin, West of Yunnan Province[J]. J4, 2012, 42(4): 1090-1098.

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