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This study presents crack initiation, propagation and coalescence at or near pre-existing open cracks in a numerical

â Ôàêóëüòåò ãðàaeäàíñêîãî ñòðîèòåëüñòâà, ÑÀÄÐÀ èíñòèòóò, Òåãåðàí, Èðàí ã Ñû÷óàíüñêèé óíèâåðñèòåò, ×ýíäó, Êèòàé Èññëåäîâàíî âëèÿíèå ðàçúåäèíåíèÿ ñîåäèíåíèÿ ïðè ñäâèãå ïëîñêîãî íåñòàáèëüíîãî ñîåäèíåíèÿ ïîä äåéñòâèåì èíòåíñèâíîé íîðìàëüíîé íàãðóçêè ñ èñïîëüçîâàíèåì ïðîãðàììíîãî îáåñïå÷åíèÿ PFC2D. Ïåðâîíà÷àëüíî êàëèáðîâêà PFC2D ïðîâåäåíà íà îñíîâå ýêñïåðèìåíòàëüíûõ äàííûõ äëÿ ñîãëàñîâàíèÿ ñ ìîäåëèðóåìûì ÷èñëîâûì ðåçóëüòàòîì. Äîñòîâåðíîñòü ìîäåëèðóåìûõ ìîäåëåé ïðîâåðåíà ïðè ñðàâíåíèè ñ ðåçóëüòàòàìè ïðÿìûõ èñïûòàíèé íà ñäâèã, âûïîëíåííûõ íà íåñòàáèëüíûõ ñî÷ëåíåííûõ ôèçè÷åñêèõ ìîäåëÿõ. Áëàãîäàðÿ ÷èñëîâîìó ïðÿìîìó èñïûòàíèþ íà ñäâèã ïðîöåññ ðàçðóøåíèÿ áûë îòìå÷åí âèçóàëüíî, è ðàçðóøåííûå îáðàçöû îòáèðàëèñü ïîäîáíûìè ýêñïåðèìåíòàëüíî íàáëþäàåìûì òåíäåíöèÿì. Äèñêðåòíîå ìîäåëèðîâàíèå ýëåìåíòà ïîêàçûâàåò, ÷òî íà ðàçðóøåíèå îáðàçöà ãëàâíûì îáðàçîì âëèÿåò ðàçúåäèíåíèå ñîåäèíåíèÿ, â òî âðåìÿ êàê ïðî÷íîñòü ïðè ñäâèãå ñâÿçàíà ñ ìîäåëüþ ðàçðóøåíèÿ è ìåõàíèçìîì ðàçðóøåíèÿ.Êëþ÷åâûå ñëîâà: ïðîãðàììíîå îáåñïå÷åíèå PFC2D, íåñòàáèëüíîå ñîåäèíåíèå, ðàçúåäèíåíèå ñîåäèíåíèÿ, òðåùèíû ñäâèãà è ðàñòÿaeåíèÿ. Introduction. The rock mass is composed of non-persistent joints and intact rock [1].The shear sliding of non-persistent joints is important factor controlling the mechanical behavior of rock masses [2]. Therefore, a study on the shear failure behavior of nonpersistent joint can provide a good understanding of both local and general rock instabilities, leading to an improved design for rock engineering projects. Lajtai [3,4], tensile wing cracks were found to first appear at the tips of horizontal joints, followed by the secondary shear cracks propagating towards the opposite joint. Savilahti et al. [5] did some further study on the specimens with jointed rock under direct shear testing where the joint separation varies in both horizontal and vertical directions and joint arrangement changes from non-overlapping to overlapping using modelling material. The coalescence patterns for specimens indicated that, the jointed rock failed in mixed and tensile modes for non-overlapping and overlapping joint configurations, respectively. Wong et al. [6] studied

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