基于天然红层材料的软岩成型模拟研究

Molding simulation of soft rock based on natural red bed materials

岩石模拟是岩土工程模型试验、地质岩芯模拟试验等研究的核心。但目前基于人工材料的模拟制备受限于现有相似理论与技术手段,成岩结果与实际岩性差异较大,特别是软岩的成型模拟问题尤为突出。以天然红层材料为原料,改进传统的成岩模拟系统,考虑成岩过程中温度、孔隙流体压力及上覆压力的分阶段影响,模拟红层软岩从松散岩土颗粒到岩石的形成过程,得到工程标准尺寸软岩岩芯。通过与天然红层软岩进行成岩过程、物理性质、化学性质及力学性质的对比研究表明,以天然红层为原料的软岩岩芯与天然红层软岩性质相似。该研究突破了人工材料配制、3D打印等方法一般只能满足某一方面性质的局限,为大量不同功能需求的软岩岩芯研究提供了新的制作思路与方法。

Rock simulation is the core of the researches such as geotechnical engineering model test and geological core simulation tests.At present,however,the molding simulation results based on artificial materials are greatly different with that from the actual rock properties due to the limitations of existing similarity theory and technical approaches,especially for the molding simulation of soft rock.In this study,the natural red beds is taken as the raw materials and the traditional diagenesis simulation system is improved.The influences of temperature,pore fluid pressure and overlying pressure are considered herein.The formation process of red bed is realized from the loose rock and soil particles to the rock and the engineering standard size soft rock cores are obtained.Based on the comparison results of diagenesis process,physical properties,chemical properties and mechanical properties between the natural red bed soft rock and the soft rock core that based on natural red bed materials,it is found that the simulated soft rock cores have similar properties with that of the natural red beds soft rock.This study breaks through the limitations where only certain properties can be generally satisfied from the artificial material similarity simulation,3D printing or other methods.This study can provide a new manufacturing ideas and methods for the research of large demand soft rock core with differing functional requirements.