张永双, 郭长宝, 曲永新, 张明. 2012: 云南腾冲膨胀性硅藻土的发现及其工程地质意义. 工程地质学报, 20(2): 266-275.
    引用本文: 张永双, 郭长宝, 曲永新, 张明. 2012: 云南腾冲膨胀性硅藻土的发现及其工程地质意义. 工程地质学报, 20(2): 266-275.
    ZHANG Yongshuang, GUO Changbao, QU Yongxin, ZHANG Ming. 2012: DISCOVERY OF SWELLING DIATOMITE AT TENGCHONG,YUNNAN PROVINCE AND ITS IMPLICATION IN ENGINEERING GEOLOGY. JOURNAL OF ENGINEERING GEOLOGY, 20(2): 266-275.
    Citation: ZHANG Yongshuang, GUO Changbao, QU Yongxin, ZHANG Ming. 2012: DISCOVERY OF SWELLING DIATOMITE AT TENGCHONG,YUNNAN PROVINCE AND ITS IMPLICATION IN ENGINEERING GEOLOGY. JOURNAL OF ENGINEERING GEOLOGY, 20(2): 266-275.

    云南腾冲膨胀性硅藻土的发现及其工程地质意义

    DISCOVERY OF SWELLING DIATOMITE AT TENGCHONG,YUNNAN PROVINCE AND ITS IMPLICATION IN ENGINEERING GEOLOGY

    • 摘要: 结合在建的云南保山—腾冲高速公路沿线及周边地区典型地质剖面观测和多种室内试验手段测试,揭示了腾冲芒棒盆地的硅藻土是以硅藻为主、富含黏土矿物的黏土质硅藻土,属于一种轻质强膨胀性极软岩。其具有典型硅藻土与膨胀性黏土岩双重物理和水理性质,前者表现为极高的孔隙性、高吸水性、极强的结构性; 后者则表现为高塑性、显著的膨胀崩解性,而且膨胀崩解特性的显现与有机质含量密切相关。腾冲芒棒盆地膨胀性硅藻土的发现及其工程地质特性的研究,有助于加深对保山-腾冲高速公路沿线地质灾害形成机理的认识,对揭示中国西南地区某些湖相地层工程特性及地质灾害多发原因也具有重要的启示意义。

       

      Abstract: This paper was based on the field investigation of the typical geological sections and multiple methods of laboratory tests on the samples from the slopes along the Baoshan-Tengchong highway and adjacent area in Yunnan Province. It discovered a swelling clayey diatomite in the Neogene lacustrine strata, named Mangbang formation, at Tengchong area Yunnan Province. The clayey diatomite is belonging to a type of both light and strong swelling rock, which has double physical-hydraulic properties of both typical diatomite and swelling clay rock. The former include high porosity, high water absorption capacity, and very strong structure, the later include high plasticity, outstanding swelling and disintegration properties, and the appearance of swelling property mainly connected with the contents of organic matter. The discovery of the swelling clayey diatomite in Mangbang Basin, as well as the researches on its engineering properties, is not only instructive for realization of the mechanism of related geo-hazards along the Baoshan-Tengchong high way, but also helpful to understanding the engineering properties of some lacustrine deposits and their easily causing geo-hazards in southwestern China.

       

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