饱水裂隙砂岩动态力学特性与裂纹扩展规律研究

doi:10.13722/j.cnki.jrme.2023.0904

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摘要为研究饱水裂隙岩石动态力学特性及裂纹扩展规律，对预制0°，15°，30°，45°，60°，75°，90°共7种倾角裂隙的砂岩试件进行饱水处理，利用SHPB试验装置开展冲击压缩试验。结果表明：不同倾角预制裂隙的饱水砂岩和天然砂岩试件动应力–应变曲线相似，大致分为3个阶段，试件动抗压强度、动应变和动弹性模量均随裂隙倾角增大整体呈先减小后增大的趋势；与预制裂隙天然砂岩试件相比，饱水砂岩试件动抗压强度和动弹性模量略有提升，而动应变减小，表现出动态加载条件下水作用的Stefan效应。随预制裂隙倾角变化，饱水砂岩试件破坏方式呈现为张拉、剪切和张拉剪切复合型等破坏模式，裂隙倾角0°和15°时为II型破坏，30°～75°时为I–II复合型破坏，90°时为I型破坏。预制裂隙砂岩试件裂纹起裂位置主要集中在裂隙尖端附近，起裂角随预制裂隙倾角增大而减小，且入射端起裂角大于透射端。

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	平琦1
	2
	3
	孙施佳2
	3
	高祺2
	3
	吴世伟2
	3
	李向阳2
	3
	徐一杰2
	3
	胡静2
	3
	唐庆林2
	3

关键词 ：岩石力学, 饱水状态, 裂隙砂岩, 冲击压缩, SHPB试验装置

Abstract：In order to study the dynamic mechanical properties and crack extension law of water-saturated fractured sandstone，sandstone specimens with seven prefabricated crack inclinations(0°，15°，30°，45°，60°，75°，and 90°) were saturated with water，and impact compression tests were carried out with the split Hopkinson pressure bar(SHPB) test device. The results show that the dynamic stress-strain curves of prefabricated and natural sandstone samples with different inclination angles are similar，and can be roughly divided into three stages. The dynamic compressive strength，dynamic strain and dynamic elastic modulus all showed an overall trend of decreasing and then increasing with increasing fracture inclination. Compared with prefabricated natural sandstone specimens，the dynamic compressive strength and dynamic elastic modulus of the water-saturated sandstone specimens were slightly increased，while the dynamic strain was reduced，showing the Stefan effect of water action under dynamic loading conditions. With the change of fracture inclination，the failure modes of water-saturated sandstone specimens are tensile，shear and tension-shear composite failure modes. The fracture inclination is 0° and 15° for type II failure，30°‐75° for I-II composite failure，and 90° for type I failure. The crack initiation position of prefabricated fractured sandstone specimens is mainly concentrated near the fracture tip，and the crack initiation angle decreases with the increase of the fracture inclination angle，and the crack initiation angle at the incident end is larger than that at the transmitted end.

Key words： rock mechanics saturation state fractured sandstone shock compression SHPB test device

引用本文:

平琦1，2，3，孙施佳2，3，高祺2，3，吴世伟2，3，李向阳2，3，徐一杰2，3，胡静2，3，唐庆林2，3. 饱水裂隙砂岩动态力学特性与裂纹扩展规律研究[J]. 岩石力学与工程学报, 2024, 43(S1): 3131-3139.
PING Qi1，2，3，SUN Shijia2，3，GAO Qi2，3，WU Shiwei2，3，LI Xiangyang2，3，XU Yijie2，3，HU Jing2，3，TANG Qinglin2，3. Study on dynamic mechanical properties and crack extension law of water-saturated fractured sandstone. , 2024, 43(S1): 3131-3139.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0904 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS1/3131

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