论文部分内容阅读
以大连黄泥川现役隧道仰拱处开槽铺设水管工程为实例,采用室内实验及工程类比等方法,结合现场实际情况,确定相似实验原材料为中砂、石膏粉、425普通硅酸盐水泥,配合比选用相似程度最高的755组。针对仰拱处不同深度开槽隧道围岩的变形破坏机理进行研究,采用相似模型实验、数值模拟,结果表明:开槽后仰拱处的承载能力较未开槽时变强;当开槽深度小于2m时,仰拱处的承载能力随着开槽深度的增大而变强,但是当开槽深度超过2m后,承载能力随着开槽深度增加而变弱;而开槽深度不超过2m时,槽底最先受拉破坏,开槽深度超过2m时,拱顶最先受拉破坏;开槽深度为2m时,承载能力最大,说明此开槽深度为最优值。
Taking the example of slotted aqueduct on the arch of the active tunnel of Huangni Chuan in Dalian, indoor experiment and engineering analogy were used as examples to determine the similar experimental raw materials for medium sand, gypsum powder, 425 ordinary Portland cement, With the highest level of selection of similar 755 group. Aiming at the deformation and failure mechanism of surrounding rock of slotted tunnel with different depths on the inverted arch, similar model experiments and numerical simulation are carried out. The results show that the bearing capacity of the inverted arch after slotting becomes stronger than that of the case without slotting. When the depth is less than 2m, the bearing capacity at the inverted arch becomes stronger with the increase of the depth of the groove, but when the depth of the groove exceeds 2m, the bearing capacity becomes weaker with the increase of the depth of the groove; while the depth of the groove does not exceed 2m When the groove depth exceeds 2m, the vault is the first to be damaged by pulling. When the groove depth is 2m, the bearing capacity is the largest, indicating that the groove depth is the optimal value.