Abstract
The article describes the escalator tunnel construction using tunnel boring machines in St. Petersburg. To reduce the harmful effects of underground construction on the Earth's surface in the mouth of the tunnel technology is used jet grouting rock mass. Based on the analysis of field data of the earth surface subsidence and rock strata proved the effectiveness of the jet grouting technology. Subsidence of the surface and within the grouting area, are approximately null. The fact that the development of subsidence occurs mainly outside the zone of jet grouting soil is shown. A method of reducing subsidence by grouting additional unstable rocks in the massif, which will reduce the harmful effects of underground construction for an massif and the earth's surface, is offered. To assess the efficiency of the proposed method, a numerical modeling based on the finite element method is carried out. According to the modeling results it is revealed that the proposed method will reduce the subsidence at the surface by 2-3 times.
Highlights
Для снижения вредного влияния подземного строительства на земную поверхность в устьевой части тоннеля применяется технология струйной цементации породного массива
Based on the analysis of field data of the earth surface subsidence and rock strata proved the effectiveness of the jet grouting technology
A method of reducing subsidence by grouting additional unstable rocks in the massif, which will reduce the harmful effects of underground construction for an massif and the earth's surface, is offered
Summary
Для снижения вредного влияния подземного строительства на земную поверхность в устьевой части тоннеля применяется технология струйной цементации породного массива. Практика проходки эскалаторных тоннелей с применением ТПМК в Санкт-Петербурге показала, что обеспечить отсутствие сдвижений пород по контуру тоннеля за счет четкого соблюдения технологических режимов невозможно. Основным способом снижения оседаний на поверхности следует признать использование методов, позволяющих изменить свойства окружающих тоннель пород, например применение струйной цементации грунта (jet grouting) вблизи устья тоннеля
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