强吸波矿物对微波辅助破岩效果影响规律及机制研究

张志强; 李铧辰; 陈方方; 卢高明; 侯宇杰

doi:10.3973/j.issn.2096-4498.2023.08.005

隧道建设 >

2023 , Vol. 43 >Issue 8: 1308 - 1315

DOI: https://doi.org/10.3973/j.issn.2096-4498.2023.08.005

研究与探索

强吸波矿物对微波辅助破岩效果影响规律及机制研究

张志强 ,
李铧辰 ,
陈方方 ,
卢高明 ,
侯宇杰

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（1. 西安理工大学土木建筑工程学院，陕西西安 710048； 2. 西安科技大学建筑与土木工程学院，陕西西安 710054； 3. 盾构及掘进技术国家重点实验室，河南郑州 450001）

张志强(1976—)，男，四川广汉人，2009年毕业于西安理工大学，岩土工程专业，博士，教授，现从事裂隙岩体力学、微波辅助破岩等研究工作。 Email: zhangzq87@xaut.edu.cn。

网络出版日期: 2023-09-10

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Influence Law and Mechanism of Strong WaveAbsorbing Minerals on MicrowaveAssisted RockBreaking Effect

ZHANG Zhiqiang ,
LI Huachen ,
CHEN Fangfang ,
LU Gaoming ,
HOU Yujie

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(1. School of Civil Engineering and Architecture, Xi′an University of Technology, Xi′an 710048, Shaanxi, China;2. School of Architecture and Civil Engineering, Xi′an University of Science and Technology, Xi′an 710054, Shaanxi, China;3. State Key Laboratory of Shield Machine and Boring Technology, Zhengzhou 450001, Henan, China)

Online published: 2023-09-10

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摘要

为更深入分析微波照射岩石破坏机制及强吸波矿物含量对微波照射弱化岩石效果的影响程度，以玄武岩为研究对象，利用离散元软件PFC(particle flow code)，建立多颗粒钛铁矿-辉石-斜长石三元介质玄武岩细观结构数值计算模型，对在高功率短时间的微波照射条件下强吸波矿物(钛铁矿)含量变化对微波照射后玄武岩裂纹的萌生、发展及强度弱化效果影响进行研究。研究表明： 1)玄武岩试样经微波照射后，发现玄武岩内部首先在强吸波矿物与相对弱吸波矿物交界处产生大量沿晶裂纹，随后部分沿晶裂纹逐渐扩展并以最短连接路径穿过矿物形成穿晶裂纹； 2)微波照射后，沿晶裂纹主要集中在钛铁矿-斜长石交界处，穿晶裂纹主要分布于钛铁矿和辉石； 3)经微波照射，玄武岩试样产生不均匀性分布的损伤，增强了岩石韧性，随钛铁矿含量增加，经微波照射后玄武岩试样的峰值强度和弹性模量显著降低，应力-应变曲线起伏态势增强、峰值产生点提前，并且玄武岩试样的强度弱化程度与强吸波矿物钛铁矿含量之间呈现正比例关系。

关键词： 辅助破岩; 微波照射; 玄武岩; 强吸波矿物; 强度弱化; 致裂机制

本文引用格式

张志强 , 李铧辰 , 陈方方 , 卢高明 , 侯宇杰 . 强吸波矿物对微波辅助破岩效果影响规律及机制研究[J]. 隧道建设, 2023 , 43(8) : 1308 -1315 . DOI: 10.3973/j.issn.2096-4498.2023.08.005

Abstract

To explore the rock damage mechanism under microwave irradiation and the influence of strong waveabsorbing mineral content on the effect of microwave irradiation on fracturing rocks, basalt is selected as the research object and the discreteelement program particle flow code is used to establish a microscopicstructure analysis model based on numerical calculation for ternary medium basalt composed of ilmenite, diopside, and plagioclase. The influence of the content variation of strong waveabsorbing mineral (ilmenite) on the initiation and development of basalt cracks and the strength weakening effect after microwave irradiation is examined under the irradiation conditions of high power and short time. The results show the following: (1) A large number of intergranular cracks occurred first at the junction between strong waveabsorbing minerals and relatively weak waveabsorbing minerals inside the basalt, and then, some intergranular cracks gradually expanded and passed through the minerals with the shortest connecting path to form transgranular cracks. (2) The intergranular cracks were mainly concentrated at the ilmeniteplagioclase junction, while the transgranular cracks were mainly distributed in ilmenite and diopside. (3) The basalt sample produced damage with uneven distribution, enhancing the rock toughness. Furthermore, with increasing ilmenite content, the peak strength and elastic modulus of the basalt sample significantly decreased, the stressstrain curve fluctuation increased, and the peak generation point advanced. Moreover, the degree of strength weakening of the basalt sample was directly proportional to the ilmenite content, which is a strong waveabsorbing mineral.

Key words： assisted rock breaking; microwave irradiation; basalt; strong waveabsorbing mineral; strength weakening; cracking mechanism

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