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岩体钻孔过程中结构夹层力学性质的试验研究

Experimental investigation of mechanical properties of structural interlayers for rock masses during drilling process.

作者信息

Liu Xinxing

机构信息

China Coal Science & Technology Ecological Environment Technology Co. Ltd, Beijing, 100013, China.

出版信息

Sci Rep. 2024 Oct 7;14(1):23324. doi: 10.1038/s41598-024-73425-5.

DOI:10.1038/s41598-024-73425-5
PMID:39375366
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11458583/
Abstract

With the continuous development of underground engineering construction in China, it is particularly important to study the identification of structural plane characteristics of rock masses. In this study, three types of pseudo-rock specimens with structural plane interlayers were fabricated to analyze the patterns of drilling parameter changes in rock bodies with structural planes during the drilling process and to explore the characterization and identification methods of rock body structural planes. Gneiss, granite, and sandstone were used as rock materials, with gypsum mortar as the interlayer material for the structural planes in these three types of specimens. The indoor digital drilling equipment was utilized for conducting indoor digital drilling experiments. The variation patterns of drilling parameters in rock bodies with structural surfaces under different interlayer inclinations and thicknesses were analyzed. The relationship between the ratio of the change in rotational speed and drilling speed during the stable phase of the upper rock mass and the peak torque and peak drilling pressure has been established. The relationship between the structural plane inclination angle and the ratio of change in rotational speed and drilling speed has been determined. By utilizing the variation in these ratios, the impacts of the structural plane inclination angle and the thickness of the structural plane on the peak torque and peak drilling pressure have been elucidated. The research results provide a theoretical basis for the stability evaluation of rock masses with structural planes under drilling action.

摘要

随着我国地下工程建设的不断发展，研究岩体结构面特征的识别尤为重要。在本研究中，制作了三种带有结构面夹层的类岩石试件，以分析钻孔过程中含结构面岩体的钻进参数变化规律，并探索岩体结构面的表征和识别方法。选用片麻岩、花岗岩和砂岩作为岩石材料，以石膏砂浆作为这三种试件结构面的夹层材料。利用室内数字钻孔设备进行室内数字钻孔试验。分析了不同夹层倾角和厚度条件下含结构面岩体钻进参数的变化规律。建立了上部岩体稳定阶段转速变化率与钻进速度变化率同峰值扭矩和峰值钻进压力之间的关系。确定了结构面倾角与转速变化率和钻进速度变化率之间的关系。通过利用这些变化率，阐明了结构面倾角和结构面厚度对峰值扭矩和峰值钻进压力的影响。研究结果为钻孔作用下含结构面岩体的稳定性评价提供了理论依据。

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An experimental investigation into the borehole drilling and strata characteristics.对钻孔和地层特征的实验研究。
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