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Study on Thermal Sensitivity and Crack Propagation of Granite Based on Discrete Element Method
Received date: 2021-11-26
Revised date: 2022-04-11
Online published: 2022-10-31
Under a certain stress state，the thermal induced stress field and the initial stress field are superimposed，resulting in the initiation of new thermal cracks on the basis of the original cracks，which affects the mechanical properties of the rock.However，the effect of thermal stress field can also be applied to rock crushing.It is necessary to study the fracture caused by thermal and mechanical action of rock.Due to the limited monitoring technology of the experiment under high temperature，the relevant research is difficult to carry out.Using the method of combining experiment and simulation，based on the experiment and the discrete element method，the cracking process caused by heat and force of prefabricated crack model with different inclination angles was studied under different initial stress states. The relevant thermal eigenvalues were analyzed，and the propagation path of thermal crack was theoretically analyzed according to the fracture criterion and the evolution process of the second invariant in the heating process.The results show that under the high stress state，the thermal sensitivity is strong （the crack initiation temperature is low，the crack propagation temperature range is in the front，and the crack propagation process is intense），the peak temperature is low，but the peak thermal stress is high.Prefabricated cracks with different angles will also affect the relevant thermal eigenvalues. Under the same initial stress state，with the increase of prefabricated crack angle，the thermal sensitivity de-creases.Moreover，the peak temperature has a similar law.When the crack initiation state is reached，the thermal crack first forms at the tip of the prefabricated crack.With the increase of temperature，the distribution of the second invariant of stress changes，and the thermal crack will expand at the maximum of the second invariant.The research results have certain reference significance for deep thermal rock breaking and rock engineering stability.
Mingjian LI , Tubing YIN , Xiaosong TAN , Zheng YANG . Study on Thermal Sensitivity and Crack Propagation of Granite Based on Discrete Element Method[J]. Gold Science and Technology, 2022 , 30(4) : 559 -573 . DOI: 10.11872/j.issn.1005-2518.2022.04.181
山东黄金：前三季度净利同比预增148.61%~156.09%
近期，山东黄金集团发布2022年前三季度业绩预盈公告。预计前三季度实现归属于上市公司股东的净利润6.5亿元至7.5亿元，同比增加148.61%~156.09%；预计实现归属于上市公司股东的扣非净利润7.13亿元至8.13亿元，同比增加156.35%~164.25%。
公司称，通过强化战略规划引领、全力推进复工达产、全面加强精益管理、加快推进资源整合、从严抓好安全环保等举措，所属矿山自2021年下半年起，黄金产量逐步提升，收效明显。今年前三季度，随着产能的恢复，公司黄金主业盈利能力增强，持续巩固了向上向好发展态势。
金矿资源是影响黄金企业发展的核心关键因素。公司表示，当前正加快推进世界级黄金基地建设，着力发挥公司位于胶东半岛的招莱区域黄金资源的规模化优势和现代化生产水平，确定了以“三山岛资源带、焦家资源带、新城资源带”等矿权资源为基础，以矿业、冶炼、循环经济、智能矿山、生态矿业、产业协同六大规划板块为依托的世界级黄金基地建设规划，为公司的规模化生产经营及发展壮大提供强大的资源支撑。
（来源：中国证券报）
http://www.goldsci.ac.cn/article/2022/1005-2518/1005-2518-2022-30-4-559.shtml
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