热处理下含钻孔结晶岩裂纹发育及力学特性  

Experimental high-temperature heat treatment of crystalline rocks and analysis of crack development characteristics

作　　者：王李昌 董陇军[2,4] 王璐 肖敏杰[3] 隆威 WANG Lichang;DONG Longjun;WANG Lu;XIAO Minjie;LONG Wei(School of Geosciences and Info-physics,Central South University,Changsha 410083,China;School of Resources and Safety Engineering,Central South University,Changsha 410083,China;China Civil Engineering Construction Corporation,Beijing 100038,China;Deep Underground Resources and Energy Technology and Innovation Center,Central South University,Changsha 410083,China)

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083 [2]中南大学资源与安全工程学院,长沙410083 [3]中国土木工程集团有限公司,北京100038 [4]中南大学长沙市深地资源能源开发技术创新中心,长沙410083

出　　处：《中国有色金属学报》2025年第3期1005-1016,共12页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52104112);长沙市科技计划重大专项项目(kh2401026);湖南省科技创新计划资助项目(2023RC3051);湖南省自然科学基金资助项目(2025JJ20030)。

摘　　要：干热岩开发系统中井壁围岩稳定受到深部高温高应力环境的影响,钻井井壁极易发生失稳破坏,结晶岩是干热型地热能的主要赋存岩体,因此选取含钻孔闪长岩试样进行热处理试验,以研究温度对裂纹发育的影响,并进行双轴压缩声发射试验模拟井内环境。结果表明:升高温度能够促进结晶岩微观、细观裂纹发育活动;在双轴应力作用下,试样产生大量的宏观裂纹,沿孔壁的破裂带发生剪切滑移破坏;温度升高促进了试样微裂纹的发育,导致高温热处理后的试样在双轴应力作用下破坏后形成的岩块强度和完整性降低,试样粉碎程度随温度升高而增加。研究成果可为深层地热钻井稳定性控制提供理论依据。The stability of wellbore surrounding rock in hot dry rock(HDR)development systems is critically influenced by deep high-temperature and high-stress environments,where borehole instability and failure frequently occur.As crystalline rocks serve as the primary reservoirs for HDR geothermal energy,the diorite specimens containing boreholes were subjected to thermal treatment experiments to investigate temperature effects on crack development,combined with biaxial compression acoustic emission tests to simulate in-well conditions.The results demonstrate that elevated temperatures significantly promote the initiation and propagation of micro-and meso-scale cracks in crystalline rocks.Under biaxial stress,the macroscopic cracks extensively develop in the specimens,with shear slip failure occurring along fracture zones near borehole walls.Increased temperature accelerates microcrack evolution,leading to reduced strength and integrity of thermally treated rock fragments post-failure under biaxial loading.Furthermore,the degree of rock fragmentation exhibits a positive correlation with temperature.These findings provide a theoretical foundation for stability control in deep geothermal drilling operations.

关 键 词：结晶岩 高温热处理 双轴应力 声发射 裂纹发育 

分 类 号：TU45[建筑科学—岩土工程]