The Variation Law of In-situ Stress and Rock Mechanical Parameters with Buried Depth in Coastal Mining Area and Their Relationship
Received date: 2020-08-13
Revised date: 2021-05-25
Online published: 2021-10-08
The Xiling mining area in Sanshandao gold mine is the first coastal metal mining area in China.Therefore，it is of great significance for coastal rock engineering excavation design and disaster control to study the effect of the buried depth on in-situ stress，rock mechanical properties and their relationship.For this purpose，the standard rock specimen at 5 different buried depths ranging from 300 m to 1 900 m were taken from the three geological drilling in this mining area，namely ZK88-21，ZK88-14 and ZK94-2.With the aid of MTS815，the mechanical parameters and acoustic emission Kaiser point in different directions of rock at different buried depths were tested，and the mechanical properties and in-situ stress of rocks were further obtained.On this basis，the in-situ stress，rock mechanics parameters and their interrelationships at different buried depths were analyzed.The results show that the mechanics parameters，self-weight stress，vertical stress，maximum horizontal stress and minimum horizontal stress have a logarithmic relationship with the buried depth，and the increase amplitude of vertical stress is gradually smaller than that of the self-weight stress with the increase of the buried depth.Similarly，the rock mechanics parameters are roughly logarithmic to the in-situ stress.Among them，the effect of the maximum horizontal stress on the rock mechanical parameters is greater than that of the minimum principal stress.In addition，the effect of buried depth on the tensile strength is greater than its effect on the compressive strength.
Xi WANG , Chunde MA , Xingquan LIU , Mingwei JIANG , Yuyun FAN . The Variation Law of In-situ Stress and Rock Mechanical Parameters with Buried Depth in Coastal Mining Area and Their Relationship[J]. Gold Science and Technology, 2021 , 29(4) : 535 -544 . DOI: 10.11872/j.issn.1005-2518.2021.04.150
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