ABSTRACT
In the conditions of intensive development of urban engineering and transport infrastructure, long-operating sewage tunnel collectors face the action of a combination of unfavorable anthropogenic effects. The external anthropogenic effects include additional static and vibro-dynamic loads caused by ground and underground transport, changes in urban planning and geotechnical conditions, as a rule, during joint underground and high-rise construction. The internal effects include sign-alternating (pressure and non-pressure) influence of aggressive sewage waters and, consequently, structural corrosion and beyond-limit decrease of the bearing capacity during long-term exploitation. The paper gives real practical examples and shows that simulation of pre-limit strain-stress behavior of tunnel collectors under the conditions of combined anthropogenic effects and calculative substantiation of protective measures ensure the bearing capacity and service reliability during the lifecycle at the stages of reconstruction and use.
