学术论文

      内水压下含中空裂隙新型材料的压裂试验及数值模拟研究

      Fracturing Experiment and Numerical Simulation Study on New Material Containing a Hollow Internal Crack Under Internal Water Pressure

      摘要:
      研制出一种完全透明、-15~-10℃下拉压强度比达1/6.6的树脂材料,其与岩石特性的相似程度比前人研究成果有大幅提高.制作了内置单裂隙试件,所含裂隙为中空张开型.采用自主设计的注水设备和低温加载装置,在固定水压作用下,分别开展水压为2、4 MPa时的单轴压缩试验和水压为2 MPa时的双轴压缩试验.详细描述了试件的次生裂纹形态和裂隙扩展过程,分析其产生的条件与机制,对比了有水与无水条件下试件破裂规律的异同.采用FLAC3D开展数值模拟研究,在FLAC3D自带均质流体模型基础上,引入改进的弹脆性本构模型,对损伤单元的力学参数和渗透系数进行二次定义,计算结果与文中试验结果相符合,表明了新数值模拟方法的有效性,可以很好地反映水压作用下裂隙岩体强度和稳定性的变化特征.
      Abstract:
      A new resin material is developed,which is completely transparent and has more brittle rock-like fracture properties than before.Its tension-compression ratio is up to 1/6.6 at-15~-10 ℃ and open fractures can be made inside.Water injection device,loading equipment and technological methods are correspondingly designed.Experiments on hydraulic fracturing are carried out.Cases of two different internal water pressures under uniaxial compression and one constant internal water pressure under biaxial compression are investigated.Failure and secondary crack propagation processes of the specimen are described and analyzed in detail,and the produce condition and mechanism are studied.Furthermore,comparative study on specimen failure and secondary crack propagation between cases of water pressure and no water are also conducted.Besides,numerical simulation is carried out using FLAC3D.Based on isotropic fluid model of FLAC3D,a new elastic-brittle constitutive model is introduced and mechanical parameters and permeability coefficients of damaged elements are redefined.The superfine and reasonable form of unit division is also required.The numerical simulation results are in good agreement with the testing results in this paper,which suggests the effectiveness of the new numerical simulation method.
      作者: 付金伟 [1] 朱维申 [2] 张新中 [3] 石路杨 [3] 谢富东 [4]
      Author: FU Jinwei [1] ZHU Weishen [2] ZHANG Xinzhong [3] SHI Luyang [3] XIE Fudong [4]
      作者单位: 华北水利水电大学土木与交通学院,河南郑州450045;山东大学岩土与结构工程研究中心,山东济南250061 山东大学岩土与结构工程研究中心,山东济南,250061 华北水利水电大学土木与交通学院,河南郑州,450045 国家电网济南供电公司,山东济南,250012
      刊 名: 工程科学与技术 ISTICEIPKU
      年,卷(期): 2017, 49(4)
      分类号: TU43
      在线出版日期: 2017年9月18日
      基金项目: 国家自然科学基金资助项目,华北水利水电大学高层次人才科研启动项目资助,高等学校博士学科点专项科研基金博导类资助项目