为了准确研究深层页岩断裂损伤演化规律,基于三维扫描获取了深层页岩的天然裂缝面,采用三维建模、3D打印和类岩样材料制备了深层页岩粗糙裂缝面和岩样基质,进一步通过分层浇筑制备了含有不同裂缝倾角和粗糙裂缝面的岩样试样。通过真三轴压缩试验,探究了不同裂缝倾角和不同力学加载方式对岩样力学性能和破坏形态的影响规律。结果表明:(1)利用3D打印技术和分层浇筑制备的类岩样可以代替深层页岩,用于研究井壁崩塌破坏规律。(2)不同裂缝倾角对岩样抗压强度的影响规律总体均呈先减小后增大,呈“U”型变化趋势。(3)不同力学加载方式对岩样抗压强度以及破坏形态的影响十分明显,不同力学加载方式导致岩样自由面产生变化,从而改变了岩样的抗压强度和破坏形态。研究成果可为制备类岩样和室内研究提供参考。
To accurately study the fracture damage evolution law of deep shale, natural fracture surfaces of deep shale are obtained based on three-dimensional scanning. Using 3D modeling, 3D printing, and rock-like materials, we prepared rough fracture surfaces and rock matrices of deep shale. Further, we fabricated rock samples containing fracture surfaces with different angles and roughness through layered pouring. True triaxial compression tests were conducted to investigate the influence of different fracture angles and mechanical loading methods on the mechanical properties and failure modes of the rock samples. The experimental results indicate that: (1) Rock-like samples prepared using 3D printing technology and layered pouring can substitute deep shale for studying the collapse failure law of wellbores. (2) The influence of different fracture angles on the compressive strength of rock samples generally shows a "U" shaped trend, with the strength first decreasing and then increasing. (3) Different mechanical loading methods significantly affect the compressive strength and failure modes of rock samples. Different loading methods lead to changes in the free surface of the rock samples, thereby altering their compressive strength and failure modes. The research results can provide a reference for the preparation of rock-like samples and indoor studies.
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