微波-力作用下硬岩损伤规律及本构研究  

Study on the Pattern of Hard Rock Damage and Constitutive Relation with the Microwave-Force Action

作　　者：胡梦玲 叶家桐 戴俊[1] 杨凡[1] HU Mengling;YE Jiatong;DAI Jun;YANG Fan(Xi′an University of Science and Technology,Xi′an 710054)

机构地区：[1]西安科技大学,西安710054

出　　处：《现代隧道技术》2022年第4期40-49,共10页Modern Tunnelling Technology

基　　金：国家自然科学基金(41702346,51174159);陕西省教育厅自然科学研究项目(No.17JK0502);陕西省教育厅专项科研研究基金(No.15JK1471)。

摘　　要：为使微波技术早日应用于破岩工程中,明确微波-力作用下硬岩的损伤规律及本构关系是必要的。引入D-P准则和Weibull分布,建立微波-力作用下硬岩本构模型,通过对硬质花岗岩进行微波照射和单轴抗压试验,探究硬岩微波损伤规律,并对本构模型进行验证。研究结果表明:随微波功率增加,花岗岩内部裂纹发育,脆性和强度明显弱化;1 min微波照射条件下,4.0 kW功率作用即可达到花岗岩损伤极限的60%,此后损伤不随功率增大而加剧,试样开裂临界功率为3.33 kW,熔融临界功率为5.33 kW;修正本构模型整体耦合较好,尤其是阈值至峰值段,耦合效果极佳,表现出极具应用价值的保守性。To apply microwave technology to rock fragmentation engineering as soon as possible, it is necessary to define the pattern of hard rock damage and constitutive relation with the microwave-force action. By introducing the D-P criteria and the Weibull distribution, a constitutive model of hard rocks with the microwave-force action is built, and through the microwave irradiation and uniaxial compression tests of hard granite, the pattern of microwave damage to hard rocks is explored and the constitutive model is verified. The study results show that the cracks in granite develop and the brittleness and strength are significantly reduced as the microwave power increases. At 4.0 kW,60% of the granite damage limit can be reached, and then the damage is not aggravated as power increases. Under the 1 min irradiation condition, the critical power of sample cracking is 3.33 kW and the critical power of melting is5.33 kW. The unity coupling of the modified constitutive model is better, and especially for the section from the threshold value to the peak value, the coupling effect is extremely good, reflecting the conservatism with a high application value.

关 键 词：微波破岩 硬岩 损伤变量 本构模型 试验 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]