CAJ | 학술논문

对20℃、70℃、140℃、200℃、300℃、400℃、600℃、800℃等8种不同温度后红砂岩的力学特性进行了试验研究，结合压汞、SEM 扫描电镜微观试验分析不同温度后红砂岩孔隙结构变化及微裂纹产生规律，并对红砂岩的不同温度劣化微观机制作初步探讨。研究表明：（1）不同温度后红砂岩单轴抗压强度在300℃达到峰值为常温的1.4倍；红砂岩劣化阀值温度为600℃，单轴抗压强度降幅达32.5%；（2）不同温度后红砂岩产生的裂纹宽度绝对多数分布在0～0.01μm区间内，该区间内各阶段裂缝的分布比值与单轴抗压强度呈较好的相关性；（3）沿晶和穿晶裂纹产生以及裂纹均质性变差是红砂岩劣化的主要影响因素。
대20℃、70℃、140℃、200℃、300℃、400℃、600℃、800℃등8충불동온도후홍사암적역학특성진행료시험연구，결합압홍、SEM 소묘전경미관시험분석불동온도후홍사암공극결구변화급미렬문산생규률，병대홍사암적불동온도열화미관궤제작초보탐토。연구표명：（1）불동온도후홍사암단축항압강도재300℃체도봉치위상온적1.4배；홍사암열화벌치온도위600℃，단축항압강도강폭체32.5%；（2）불동온도후홍사암산생적렬문관도절대다수분포재0～0.01μm구간내，해구간내각계단렬봉적분포비치여단축항압강도정교호적상관성；（3）연정화천정렬문산생이급렬문균질성변차시홍사암열화적주요영향인소。
Researches are carried out on the mechanical properties of red sandstones treated at 20°C, 70°C, 140°C、200°C, 300°C, 400°C, 600°C and 800°C, respectively. Based on the researches, the regular patterns of the pore structure and micro fracture of the heated red sandstones are investigated combined with mercury and scanning electron microscope analyses. It is concluded that: (1) the maximum uniaxial compressive strength of heated red sandstones at 300°C is 1.4 times as much as that of red sandstones at room temperature. The uniaxial compressive strength decreases by 32.5% when red stones are heated to 600°C. (2) The crack widths of heated red sandstones are mainly ranged from 0 to 0.01 μm, during which there are better correlation between the distribution ratio of cracks and the uniaxial compressive strength. (3) The main affecting factors of the deterioration of red sandstones are the transgranular cracks and heterogeneity of cracks.