Rock soil similar material and preparation method thereof

Abstract

The invention relates to a rock soil similar material and a preparation method thereof, and the rock soil similar material is particularly suitable for a geotechnical engineering geomechanics model test and a seismic modeling vibrating table physical model test. According to the rock soil similar material, powdered iron and barite powder are selected as fine aggregates, quartz sand is selected as a coarse aggregate, gypsum is selected as a cementing agent, and glycerin is selected as a conditioning agent. The preparation method comprises the following steps of: weighing and uniformly stirring all the components of the rock soil similar material according to the mass part; pouring the stirred mixture in a rigid mould and compacting the mixture by layers; and after the mould is removed, naturally airing a test piece which is taken down at a normal temperature for 5-7 days. The rock soil similar material has the advantages of high density, large strength and deformation parameter change range, wide raw material source, simple preparation method, stable mechanical property at the room temperature, no harm to a human body, and the like; and the test piece is easily processed and formed, and is naturally aired without curing.

Description

technical field [0001] The invention relates to a rock-soil similar material and a preparation method thereof, in particular to a rock-soil similar material suitable for rock-soil engineering geomechanics model tests and earthquake simulation shaking table model tests. Background technique [0002] Model test is a method to conduct scale-down research on specific engineering problems according to a certain similarity principle, including static model test and dynamic model test. The results of the model test can be used to infer the mechanical phenomena and laws that may occur in the prototype, so as to solve practical engineering problems. This research method has the advantages of intuition, simplicity, economy, speed and short test period. According to the similarity theory, similar materials should be used to make the model in the model test, and the successful development of similar materials is the prerequisite for the smooth progress of the model test. In the model t...

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Problems solved by technology

[0004] ① Using coated iron powder and barite powder as aggregate, and rosin as cementing agent [Han Boli, Chen Xialing, Song Yile, et al. Research on similar materials of rock mass [J]. Journal of Wuhan University of Water Conservancy and Electric Power. 1997(2): 6 -9], the main disadvantage of this material is that when making similar materials, the neoprene adhesive used to add film to the coarse aggregate contains toluene, which has toxic effects after invading the human body when it volatilizes

[0005] ② The main filler material is quartz sand with different particle size distribution, and gypsum, cement and water are used as binder [Zuo Baocheng, Chen Congxin, Liu Caihua, etc. Experimental research on similar materials [J]. Rock and Soil Mechanics. 2004 (11): 1805-1808], the density of quartz sand in this material is relatively small, and it is impossible to obtain a density greater than 2.6g / cm 3 similar materials

[0006] ③Using magnetite concentrate powder and river sand as the main material, gypsum or cement as the binder [Ma Fangping, Li Zhongkui, Luo Guangfu. NIOS model material and its application in geomechanical similar model tests[J]. Hydropower Acta Sinica. 2004(1): 48-51], the influence of different coarse and fine aggregate contents on the friction characteristics of the material was not considered in the development process of the material

[0007] ④ Use iron ore powder, barite powder and quartz sand as aggregates, rosin and alcohol solution as cementing agent, and gypsum as regulator [Wang Hanpeng, Li Shucai, Zhang Qiangyong, et al. Development of similar materials for new geomechanical model tests[J] .Journal of Rock Mechanics and Engineering.2006(9):1842-1847], the material is processed and stacked to make a model, and it is not easy to make a continuous and uniform model

[0008] ⑤ Use barite powder as aggregate, gypsum, engine oil or liquid paraffin oil as cement, and other materials such as quartz sand, limestone powder, zinc oxide powder, lithopone, iron powder, bentonite powder, glycerin, etc. Auxiliary materials for deformation modulus [Jiang Xiaolan, Chen Jin, Sun Shaowen, et al. Research on new materials for dam foundation rock mass in Jinping engineering geomechanics model [J]. Journal of Yangtze River Academy of Sciences. 2009(6): 40-43], this category Most of the materials are pressed and formed, and the model is made by assembling masonry. It is not easy to make a continuous and uniform model.

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