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投稿时间：2021-12-21 修订日期：2022-05-06
投稿时间：2021-12-21 修订日期：2022-05-06
中文摘要: 动态扰动促进地下岩体的内部裂纹发育，改变岩体的有效应力、渗透率及孔隙率。为此，开展了动态循环加载下致密花岗岩孔隙率、渗透率及有效应力系数（Biot’s系数）演化规律及影响机理研究。首先，针对致密花岗岩开展了考虑不同扰动因素（轴向静压、力振幅、频率及循环次数）的动态循环加载试验；之后，测试了不同扰动因素动态加载后的花岗岩孔隙率和渗透率，利用Cross-plotting法分析了不同动态扰动因素对花岗岩Biot’s系数的影响。结果表明：1）动态循环加载促进了花岗岩内部裂纹扩展，增加了孔隙占比及渗流通道，弱化了作用于花岗岩骨架颗粒上的有效应力，导致花岗岩Biot’s系数、渗透率和孔隙率增加。2）随着应力水平（轴向静压和力振幅之和）的增加，花岗岩Biot’s系数、渗透率和孔隙率的变化存在明显的应力门槛值，即65%UCS～70%UCS（UCS表示单轴抗压强度），超过门槛值后三者的增加速度迅速增加；随频率的增加，由于蠕变累积损伤逐渐减小，花岗岩Biot’s系数、渗透率和孔隙率逐渐减小；随循环次数的增加，三者呈现线性增加的趋势。3）基于相关性分析和理论推导分别建立了动态循环加载后花岗岩Biot’s系数和渗透率的经验预测模型，且模型的预测结果与试验结果具有较好的一致性。研究结果有助于理解动态扰动对岩体孔隙率、渗透率及Biot’s系数等参数的影响，为确定动态扰动后花岗岩地层有效应力系数和渗透率提供一个参考。
Abstract:Dynamic disturbance promotes the development of internal cracks in the underground rock mass, and changes the effective stress, permeability, and porosity of rock mass. Therefore, the evolution law and mechanism of porosity, permeability, and effective stress coefficient (Biot’s coefficient) of tight granite under dynamic cyclic loading were studied. Firstly, a dynamic cyclic loading test considering different disturbance factors (axial static stress, force amplitude, frequency, and cycle number) was carried out for granite. Then, the porosity and permeability measurements were performed for the disturbed granite, and the cross-plotting method was used to calculate the Biot’s coefficient of the disturbed granite. The experimental results indicate that: 1) Dynamic cyclic loading promotes internal crack propagation in granite, leading to increases in pore volume and seepage channels, and degradations of effective stress. Thus, an increase in the Biot’s coefficient, permeability, and porosity was exhibited for the disturbed granite. 2) With the increase of the stress level, the changes in Biot’s coefficient, permeability, and porosity of the disturbed granite have obvious stress thresholds, i.e., 65%UCS~70%UCS, where their increasing rate increases rapidly after the threshold value are exceeded. As the frequency increases, the Biot’s coefficient, permeability, and porosity gradually decrease due to the decrease of creep cumulative damage, whilst an approximately linearly increasing change is presented with the increase of the number of cycles. 3) Prediction models for Biot’s coefficient and permeability are established based on the correlation analysis. The predictions are in good agreement with the experimental observations. The testing results in this context are likely to be helpful for understanding the effect of dynamic disturbance on the parameters such as porosity, permeability, and Biot’s coefficient of granite and could provide a reference for determining Biot’s coefficient and permeability of the granite stratum after dynamic disturbance.
文章编号：202101243 中图分类号：TU458 文献标志码：
基金项目:国家自然科学基金项目（52178185）
| 作者 | 单位 | |
| 温宏平 | 山西工程科技职业大学 工程管理学院，山西 太原 030003 | 648541005@qq.com |
| 李炜光 | 长安大学 公路学院，陕西 西安 710061 | 262128942@qq.com |
| 王旭昊 | 长安大学 公路学院，陕西 西安 710061 | |
| 刘状壮 | 长安大学 公路学院，陕西 西安 710061 |
作者简介:第一作者：温宏平（1985—），男，讲师，硕士. 研究方向：沥青混凝土及水泥混凝土等多场耦合效应. E-mail：648541005@qq.com;通信作者：李炜光, E-mail：262128942@qq.com
引用文本：
温宏平,李炜光,王旭昊,刘状壮.动态循环加载下花岗岩孔渗参数演化规律[J].工程科学与技术,2022,54(5):119-128.
WEN Hongping,LI Weiguang,WANG Xuhao,LIU Zhuangzhuang.Evolution Law of Granite Porosity-permeability Parameters Under Dynamic Cyclic Loading[J].Advanced Engineering Sciences,2022,54(5):119-128.
引用文本：
温宏平,李炜光,王旭昊,刘状壮.动态循环加载下花岗岩孔渗参数演化规律[J].工程科学与技术,2022,54(5):119-128.
WEN Hongping,LI Weiguang,WANG Xuhao,LIU Zhuangzhuang.Evolution Law of Granite Porosity-permeability Parameters Under Dynamic Cyclic Loading[J].Advanced Engineering Sciences,2022,54(5):119-128.