Scholarlink

<p>Deep buried fractures are often subjected to temperature variations and cyclic stresses, yet the hydro-mechanical behavior of the fracture under the coupling of the two is not fully understood. In this study, we investigate the flow and deformation evolutions of granite fractures under two cyclic loadings conditions on fractured granite samples pretreated at varied temperatures up to 500 °C. The results show that under cyclic stressing, the overall deformation of the fracture is dominated by elastoplastic deformation. Under constant cyclic loadings (CCL), the plastic deformation mainly occurs in the first cycle, manifested by the recovery of the fracture permeability is much lower than that of the subsequent cycles, while under stepwise cyclic loadings (SCL), the plastic deformation more evenly occurs in each cycle, characterized by a smaller difference of the permeability reduction of the fracture after each cycle. Moreover, with the increase of pretreatment temperature, more plastic deformation of the fracture can be observed, and the overall flow loss of the fracture becomes progressively larger after cyclic stressing, but the general flow pattern is maintained. The distinct elastoplastic fracture behavior under different cyclic modes and pretreated temperature can be attributed to applied peak loading, asperity strength and microstructural changes of the granite matrix.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Permeability Variations of a Thermal-Treated Granite Fracture Under Constant and Stepwise Cyclic Loadings

  • 期刊论文

  • 发表日期：

    2025年6月16日

查看全文
  • Qinglin Deng,
  • Yunlan Bai,
  • Zhaolong Ge,
  • Yongfa Zhang,
  • Yuhuai Cui,
  • Zhi Yao,
  • Shihui Gong,
  • Qisi Huai

摘要

Deep buried fractures are often subjected to temperature variations and cyclic stresses, yet the hydro-mechanical behavior of the fracture under the coupling of the two is not fully understood. In this study, we investigate the flow and deformation evolutions of granite fractures under two cyclic loadings conditions on fractured granite samples pretreated at varied temperatures up to 500 °C. The results show that under cyclic stressing, the overall deformation of the fracture is dominated by elastoplastic deformation. Under constant cyclic loadings (CCL), the plastic deformation mainly occurs in the first cycle, manifested by the recovery of the fracture permeability is much lower than that of the subsequent cycles, while under stepwise cyclic loadings (SCL), the plastic deformation more evenly occurs in each cycle, characterized by a smaller difference of the permeability reduction of the fracture after each cycle. Moreover, with the increase of pretreatment temperature, more plastic deformation of the fracture can be observed, and the overall flow loss of the fracture becomes progressively larger after cyclic stressing, but the general flow pattern is maintained. The distinct elastoplastic fracture behavior under different cyclic modes and pretreated temperature can be attributed to applied peak loading, asperity strength and microstructural changes of the granite matrix.