煤矿安全2025，Vol.56Issue(7)：153-162,10.DOI:10.13347/j.cnki.mkaq.20231865
采动应力路径下裂隙砂岩细观力学特性和能量演化特征
Meso-mechanical properties and energy evolution characteristics of fractured sandstone under mining stress path
摘要
Abstract
In order to explore the differences in deformation failure characteristics and energy evolution of fractured rock masses un-der the mining stress path,triaxial loading and unloading tests were conducted on sandstone samples with different fracture lengths and angles using PFC numerical simulation.The causes of sample failure are analyzed through the failure modes of the samples,and the transformation relationship between energy storage and dissipation is characterized by the energy release coefficient k.The res-ults show that:with the increase of fracture length,the peak strength and elastic modulus of sandstone decrease,while with the in-crease of fracture angle,the peak strength and elastic modulus of sandstone first decrease and then increase;four types of cracks,namely coplanar shear cracks,anti-shear cracks,tensile cracks and far-field tensile cracks,are produced during specimen failure,and the main cause of specimen failure is the expansion of shear cracks from the tip to the end of the prefabricated cracks;the shear cracks show an evolution trend of coplanar-non-coplanar-coplanar with the fracture length,while the shear cracks show an evolution trend of coplanar-non-coplanar with the fracture angle;the influence of prefabricated fractures on the surrounding displacement field increases with the increase of fracture length and shows a change of first increasing and then decreasing with the increase of fracture angle;the energy release coefficient k shows a changing trend of decreasing-increasing-decreasing-steady decreasing,and the failure strength of the rock can be evaluated by the energy coefficient kc at the peak stress based on energy evolution.关键词
采动应力路径/围岩控制/PFC模拟/预制裂隙/裂纹演化/能量转化Key words
mining stress path/surrounding rock control/PFC simulation/prefabricated crack/crack evolution/transformation of energy分类
矿业与冶金引用本文复制引用
李雪峰,潘超,曹俊才,严林,韩腾飞,洪旭..采动应力路径下裂隙砂岩细观力学特性和能量演化特征[J].煤矿安全,2025,56(7):153-162,10.基金项目
国家自然科学基金青年科学基金资助项目(52204129) （52204129）
贵州省科技支撑计划资助项目(黔科合[2023]273) （黔科合[2023]273）
贵州省科技计划资助项目(黔科合战略找矿[2022]ZD001) （黔科合战略找矿[2022]ZD001）
