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在云南保山-腾冲高速公路建设中,遇到了与膨胀性硅藻土相关的边坡稳定问题。通过对云南腾冲五合乡、芒棒乡、团田乡多个地质剖面现场调查和室内物质成分、微观结构分析、力学性质测试表明,云南腾冲新近纪芒棒组硅藻土是一种富含膨胀性黏土矿物的黏土质硅藻土,在性状上属于膨胀性极软岩。天然硅藻土具有很强的结构性,导致其物理性质与力学性质的关系与传统岩土力学规律极不相符,如孔隙比高达2.20～2.78、液性指数为0.66～2.73的天然硅藻土单轴抗压强度竟高达1.09～2.11 MPa。综合研究表明,云南保山-腾冲高速公路建设中黏土质硅藻土边坡的滑坡灾害、风化剥落灾害与其工程特性密切相关。
In the construction of Baoshan-Tengchong Expressway in Yunnan Province, the slope stability problems associated with expansive diatomite have been encountered. Through the field survey and indoor material composition, microstructure analysis and mechanical property tests on a number of geological sections in Wuhe Township, Mang’guang Township, and Tuantian Township, Yunnan Province, the tests on the mechanical properties show that the diatomite from the Tijin Mangji Group in Yunnan Province is a Clay diatomite, an expansive clay mineral, belongs to expansive soft rock in character. Natural diatomite has a strong structure, resulting in the physical and mechanical properties of the relationship with the traditional laws of rock and in the law is extremely inconsistent, such as the porosity ratio of 2.20 ~ 2.78, liquid index of 0.66 to 2.73 natural diatomaceous earth Uniaxial compressive strength as high as 1.09 ~ 2.11 MPa. The comprehensive study shows that the landslide disaster and weathered spalling disaster of clay diatomite slope in Baoshan-Tengchong Expressway construction in Yunnan are closely related to its engineering characteristics.