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硅藻土是一种强结构性土,具有密度小、孔隙大、干燥土块吸水率高等特点。天然硅藻土的抗剪强度大,但在外界扰动或风化后,结构性强度丧失,易发生滑坡等斜坡变形破坏现象,因此,研究其在大变形下的力学性质很有必要。利用环剪仪可以研究土体在较大剪切位移条件下抗剪强度变化规律,对重塑硅藻土进行环剪试验研究,得到了不同竖向压力下的应力-位移曲线,认为重塑硅藻土为典型的应变软化型土;根据测试结果得到了重塑硅藻土的抗剪强度和残余强度,并从物质组成和微观结构特征方面对重塑硅藻土的力学性质进行了分析,为硅藻土滑坡的成因分析和灾害防治提供了依据。
Diatomite is a strong structural soil, with a small density, large pores, high moisture content of dry clods. Natural diatomite has a large shear strength. However, after the external disturbance or weathering, the structural strength is lost and landslides and other slope deformation and damage are easy to occur. Therefore, it is necessary to study the mechanical properties under large deformation. The shear shearing strength of soil under large shear displacement can be studied by means of ring shearer, and the shearing strength of remolded diatomite is studied. The stress-displacement curves under different vertical pressures are obtained, and it is considered that remodeling Diatomite is a typical strain-softening soil. According to the test results, the shear strength and residual strength of the remolded diatomite are obtained. The mechanical properties of the remolded diatomaceous earth are also analyzed from the aspects of material composition and microstructure , Provided the basis for the cause analysis and disaster prevention of diatom landslides.