胡宝文,南博文,吕聪瑞,宿辉,宋金科,李江哲,李世奇

• 1:河北工程大学水利水电学院
• 2:河北省智慧水利重点实验室
• 3:城市地下空间工程北京市重点实验室
• 4:北京科技大学土木与资源工程学院

摘要(Abstract)：

【目的】为探究工程岩体在高应力下加卸载过程中的断裂形貌变化及成因，【方法】以粗糙度作为描述形貌几何特征的重要参数，定量表征形貌变化，以拉剪比作为描述断裂特征的重要参数，定量表征断裂模式变化，选取两类花岗岩，开展加卸载力学试验，通过数字图像技术对破裂面粗糙度及成因进行分析。【结果】结果显示：在高应力卸荷条件下，初始围压、卸围压速率及矿物粒径均对花岗岩破裂面粗糙程度起负相关影响；超景深显微观察发现，粗糙程度越低的花岗岩，其断口出现剪切断裂占比越高；在围压卸荷破坏过程中，30 MPa围压卸荷，岩石破裂面以沿晶拉伸断裂为主，40 MPa围压卸荷，以沿晶和穿晶拉剪复合型断裂为主，50 MPa围压卸荷，以穿晶剪切断裂为主；随着矿物粒径和卸围压速率的增大，破裂面均呈现剪切断裂占比增加的趋势。【结论】结果表明，高围压卸荷下岩石破裂时张拉断裂占比越高，其破裂面越粗糙，相反剪切占比高，其破裂面粗糙度越低。

关键词(KeyWords)： 花岗岩;卸荷试验;粗糙程度;断裂形貌;拉剪比;力学性能;影响因素

Abstract:

Keywords:

基金项目(Foundation): 河北省自然科学基金项目基础研究专项(E2020402087);河北省自然科学基金资助项目(E2019402256);; 国家重点研发计划“超大型深井矿山高效绿色开采技术与智能装备”(2022YFC2904100);; 佛山市科技创新专项资金项目(BK22BE024)

作者(Author): 胡宝文,南博文,吕聪瑞,宿辉,宋金科,李江哲,李世奇

DOI: 10.13928/j.cnki.wrahe.2024.02.016

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