【摘要】：基于多邊形比例邊界有限元模擬了重力壩裂縫擴(kuò)展過程,綜合考慮了壩-庫水-地基相互作用、裂縫面接觸和縫水壓力的影響。其中該接觸模型能夠有效防止裂縫面的相互嵌入;該縫水模型除能考慮裂縫面開合速度、縫隙寬度和水流形態(tài)對(duì)縫水壓力分布的影響,還可基于連續(xù)性條件模擬縫內(nèi)水體流動(dòng)和空化的現(xiàn)象。以Koyna壩裂縫擴(kuò)展為例,研究了裂縫面接觸條件和縫水壓力對(duì)計(jì)算結(jié)果的影響。結(jié)果顯示,考慮接觸的影響,震損較為嚴(yán)重。而與假定為常水壓力分布的情況相比,實(shí)際的縫水壓力分布形式對(duì)結(jié)果影響較為復(fù)雜。在裂縫張開時(shí),減小了裂縫擴(kuò)展的可能,而在裂縫閉合時(shí)正好與之相反。
[Abstract]:The crack propagation process of gravity dam is simulated based on polygonal proportional boundary finite element method, and the effects of dam-reservoir-foundation interaction, crack surface contact and fracture water pressure are considered comprehensively. The contact model can effectively prevent the fracture surface from embedding into each other. The model can not only consider the effects of crack surface opening and closing velocity, gap width and flow pattern on the distribution of water pressure, but also simulate the phenomenon of water flow and cavitation in the seam based on continuous conditions. Taking the crack propagation of Koyna dam as an example, the effects of fracture surface contact conditions and fracture water pressure on the calculated results are studied. The results show that the earthquake damage is serious considering the influence of contact. Compared with the case where the normal water pressure distribution is assumed, the influence of the actual fracture water pressure distribution on the results is more complicated than that of the normal water pressure distribution. When the crack is opened, the possibility of crack propagation is reduced, but when the crack is closed, it is just the opposite.
【作者單位】： 大連理工大學(xué)海岸與近海工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;大連理工大學(xué)建設(shè)工程學(xué)部水利工程學(xué)院工程抗震研究所;
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃(項(xiàng)目編號(hào)2016YFB0201000;課題編號(hào)2016YFB0201001) 國(guó)家自然科學(xué)基金委創(chuàng)新研究群體基金(51421064)資助項(xiàng)目
【分類號(hào)】：TV642.3

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