为研究开放式微波作用下节理岩体的破裂特征，并评估微波辅助悬臂掘进机的破岩效率，开展微波致裂模拟节理岩体试验。首先，利用9块尺寸为0.5 m×0.5 m×0.3 m（长×宽×厚）的闪长岩岩样垒成1.5 m×1.5 m×0.3 m（长×宽×厚）的人造节理岩体，以模拟节理间距为0.5 m的岩石开挖面； 然后，利用6 kW的工业微波系统及缩径介质填充天线对该节理岩体进行微波照射加热致裂试验，研究不同微波照射点间距（15 cm和20 cm）下岩体的破裂特征，分析节理与照射点间距对微波致裂的影响，测量微波处理后岩体的等效岩石质量指标(RQD)和磨蚀性指数(CAI)； 最后，基于Bilgin经验模型评估微波照射前后刀盘功率为200 kW的悬臂掘进机的破岩效率和刀具磨损变化。[JP+1]结果表明： 1)2种照射点间距下，岩体的等效RQD从100降低到62和50，微波预处理可使悬臂掘进机在该闪长岩岩体中的破岩效率提高170%～280%； 2）照射点间距为20 cm时，CAI从4.0减少到3.4，可使刀具损耗降低11%。
郑彦龙
,
马中骏
,
李建春
,
赵晓豹
. Fracturing of an Artificial Rock Mass by Open-Ended Microwave and Potential Benefits to Assisted Mechanical Excavation(开放式微波致裂模拟节理岩体试验及辅助破岩评估)[J]. 隧道建设, 2023
, 43(8)
: 1338
-1347
.
DOI: 10.3973/j.issn.2096-4498.2023.08.008
In order to investigate the fracturing characteristics
of jointed rock mass subjected to openended microwave and estimate
the efficiency of microwaveassisted rock breakage by
roadheader, tests are conducted on an artificial rock mass under openended microwave. The artificial rock mass (1.5 m×1.5 m×0.3 m) is erected by nine diorite
blocks (0.5 m×0.5 m×0.3 m) to simulate a working face with a 0.5 m joint spacing. The
rock mass is treated point by point at a spacing of 15 cm and 20 cm,
respectively, using a 6 kW microwave source and an openended antenna. The influences of radiation spacing and the distance
from radiation to joint on the fracturing of the artificial rock mass are
analyzed. The equivalent rock quality designation (RQD) of the microwave
treated rock mass is then calculated and the improvement in the rock breakage
efficiency of a 200 kW roadheader is estimated based on the Bilgin empirical
model. The Crechar abrasivity indexes (CAI) of diorite with and without
microwave treatment are measured. The results show that the equivalent RQD is
reduced from 100 to 62 and 50 at an radiation spacing of 15 cm and 20 cm,
[HJ2.1mm]respectively, and the CAI is reduced from 4.0 to 3.4 at the radiation
spacing of 20 cm. Microwave treatment can significantly enhance the rock
breakage efficiency of the roadheader by 170%~280%, and reduce the tool wear by
11%.
