院报 ›› 2024, Vol. 41 ›› Issue (8): 113-119.DOI: 10.11988/ckyyb.20230554

• 岩土工程 • 上一篇    下一篇

基于双重介质渗流-应力耦合模型的高压压水试验渗透参数反演

王锦国1(), 韩智颖1(), 程伟2, 黄瑞瑞1, 尤琳2, 杨蕴1   

  1. 1 河海大学 地球科学与工程学院,南京 211100
    2 中国电建集团昆明勘测设计研究院有限公司,昆明 650051
  • 收稿日期:2023-05-21 修回日期:2023-08-28 出版日期:2024-08-01 发布日期:2024-08-13
  • 通讯作者: 韩智颖(2000-),男,江西抚州人,硕士研究生,研究方向为地下水渗流计算、多场耦合模拟。 E-mail:
  • 作者简介:

    王锦国(1974-),男,山西阳泉人,教授,博士,研究方向为地质工程、水文地质、地下水污染机理与评价等。 E-mail:

  • 基金资助:
    江苏省自然科学基金项目(BK20221507)

Inversion of Permeability in High Pressure Packer Test under Hydro-Mechanical Coupling of Dual Media

WANG Jin-guo1(), HAN Zhi-ying1(), CHENG Wei2, HUANG Rui-rui1, YOU Lin2, YANG Yun1   

  1. 1 School of Earth Science and Engineering, Hohai University, Nanjing 211100, China
    2 Power China Kunming Engineering Corporation Limited, Kunming 650051, China
  • Received:2023-05-21 Revised:2023-08-28 Published:2024-08-01 Online:2024-08-13

摘要:

高压压水试验过程中岩体易发生水力劈裂产生裂隙,岩体内部孔隙、裂隙双重导水,渗流场和应力场相互作用,导致岩体渗透参数的时空变异性。基于高压压水试验反演渗透参数需考虑双重介质渗流-应力耦合作用下产生裂隙前后渗透系数的变化规律,利用渗流-应力耦合数值模型结合工程现场高压压水试验数据进行参数反演,计算得到不同压力阶段下灰岩岩体渗透率。主要结论如下:发生水力劈裂前,随着注液压力的增大,渗透率及孔隙水压力在不同压力阶段之间分界明显,渗透率反演值与规程公式计算值相近;发生水力劈裂后,岩体渗透率增大约2倍,孔隙介质渗透率和通过的流量出现陡减现象。

关键词: 高压压水试验, 双重介质, 渗流-应力耦合, 渗透率, 水力劈裂

Abstract:

Hydraulic fracturing easily occurs in rock masses under high-pressure packer tests, involving dual water conduction via pores and cracks. This interaction between the seepage and stress fields results in spatial-temporal variations in rock mass permeability parameters. For accurate permeability parameter inversion during high-pressure packer tests, it is recommended to consider the change in permeability coefficient before and after fracture occurrence under hydro-mechanical coupling of dual media. A hydro-mechanical coupling numerical model is employed to simulate high-pressure packer tests, and parameter inversion is conducted using on-site test data to calculate limestone permeability across different pressure stages. Key findings include: before hydraulic fracturing, as injection pressure increases, permeability and pore water pressure sees distinct boundaries among different pressure stages, with inverted permeability closely aligning with specified formula values. After hydraulic fracturing, rock mass permeability increases by about 2 times, accompanied by sharp declines in matrix pore medium permeability and flow rates.

Key words: high-pressure packer test, dual media, seepage-stress coupling, permeability, hydraulic fracturing

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