CAJ | 학술논문

高地应力软岩隧道围岩流变效应明显，形变压力导致的仰拱和边墙连接处的应力集中是导致隧道底鼓破坏的重要原因，合理的隧道断面形态有利于减小应力集中，保证隧道长期安全运营。在考虑软岩流变效应的情况下，以有限元软件ABAQUS为平台，通过Python编程实现隧道断面参数化设计和有限元计算，基于结合罚函数的Nelder-Mead函数建立隧道断面优化算法，并以隧道开挖面积，隧道最大仰拱隆起，围岩蠕变损伤区面积，衬砌最大轴力和衬砌最大弯矩为优化目标，对宜-巴（宜昌至巴东）高速峡口隧道断面形态进行优化，为高地应力软岩隧道断面设计提供科学指导。
고지응력연암수도위암류변효응명현，형변압력도치적앙공화변장련접처적응력집중시도치수도저고파배적중요원인，합리적수도단면형태유리우감소응력집중，보증수도장기안전운영。재고필연암류변효응적정황하，이유한원연건ABAQUS위평태，통과Python편정실현수도단면삼수화설계화유한원계산，기우결합벌함수적Nelder-Mead함수건립수도단면우화산법，병이수도개알면적，수도최대앙공륭기，위암연변손상구면적，츤체최대축력화츤체최대만구위우화목표，대의-파（의창지파동）고속협구수도단면형태진행우화，위고지응력연암수도단면설계제공과학지도。
When tunneling in high geostress region, the surrounding rock often produces obvious rheological deformation. The deformation would lead to stress concentration at the connection between side wall and inverted arch, which might result in floor heaving during tunnel operation period. So, a reasonable section shape of tunnel which could reduce stress concentration is very important for the long-term stability of tunnel. Considering rheological effect of surrounding rock, the parameterization design of tunnel section is programed into ABAQUS by Python. And a tunnel section optimization algorithm is established based on combination penalty function and Nelder-Mead function. An optimized objective function is established for Xiakou tunnel considering excavation area, floor heaving, creep damage area, axial force and bending moment of supporting system. The optimization results will provide scientific guidance for high geostress soft rock tunnel.