【摘要】：以棋盤(pán)石工程為依托,采用1∶50的相似比,開(kāi)展模型試驗(yàn)。針對(duì)75°傾角逆斷層黏滑錯(cuò)動(dòng)的情況,研究上覆地層的錯(cuò)動(dòng)變形規(guī)律與跨斷層隧道的結(jié)構(gòu)受力、損傷特征,并對(duì)襯砌結(jié)構(gòu)的破壞模式與破壞機(jī)制進(jìn)行分析。研究表明:隨著斷層上盤(pán)抬升,斷裂傳播至地表,形成一個(gè)倒置的三角剪切帶。在2.5D埋深處剪切帶的寬度約為0.635D(D為隧道洞徑),在隧道拱頂位置處剪切帶約為0.315D。地表位移變化與斷層傳播規(guī)律基本一致;斷層破碎帶處隧道與土體的接觸壓力的變化最大,是下盤(pán)接觸壓力變化值的3~5倍;斷層上盤(pán)隧道承受負(fù)彎矩,下盤(pán)承受正彎矩;在斷層破碎帶中,錯(cuò)動(dòng)位移量為0.34D時(shí),襯砌變形縫處發(fā)生剪切、擠壓引起的開(kāi)裂,局部伴有張拉裂縫。設(shè)置變形縫后,鉸接式隧道僅在變形縫處發(fā)生嚴(yán)重破壞,節(jié)段襯砌損傷輕微,抗錯(cuò)斷效果明顯優(yōu)于未設(shè)變形縫隧道。
[Abstract]:Based on the chessboard stone project and the 1:50 similarity ratio, the model test was carried out. In view of the viscous slip dislocation of 75 擄inclination reverse fault, the law of dislocation deformation in overlying strata and the structural stress and damage characteristics of cross-fault tunnel are studied, and the failure mode and failure mechanism of lining structure are analyzed. The results show that with the uplift of the upper face of the fault, the fault propagates to the surface, forming an inverted triangular shear zone. The width of shear band at 2.5D depth is about 0.635D (D is tunnel diameter), and the shear band is about 0.315D at the top of tunnel arch. The change of surface displacement is basically consistent with the law of fault propagation, the contact pressure between tunnel and soil in the fault fracture zone is the biggest, which is 3 ~ 5 times of the change value of the contact pressure in the bottom, the tunnel in the upper side of the fault bears negative bending moment, and the lower side bears the positive moment. In the fracture zone, when the dislocation displacement is 0.34D, shearing occurs at the deformed joint of the lining, which is caused by extrusion, and there is a tension crack in the local area. After setting the deformed joint, the hinged tunnel only occurs serious damage at the deformed joint, and the damage of segment lining is slight, and the effect of anti-malfunction is obviously better than that of the tunnel without deformed joint.
【作者單位】： 同濟(jì)大學(xué)土木信息技術(shù)教育部工程研究中心;同濟(jì)大學(xué)地下建筑與工程系;上海徐匯濱江開(kāi)發(fā)投資建設(shè)有限公司;上海同濟(jì)建設(shè)工程質(zhì)量檢測(cè)站;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51478342,51278377)
【分類(lèi)號(hào)】：U451

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