ОПРЕДЕЛЕНИЕ ДАВЛЕНИЯ ГРУНТА НА ОБДЕЛКУ ТОННЕЛЯ ПО ТЕОРЕТИЧЕСКИМ РАСЧЕТАМ И ПОЛЕВЫМ ИСПЫТАНИЯМ Earth Pressure in Jinci Tunnel by Theoretical Calculation and Field Measurement

Du Yanqiang, Zhao Yan, Fu Shuai

Аннотация


На примере железнодорожного тоннеля «Цзиньчи», выполнены исследования напряженно-деформированного состояния обделки с использованием метода конечных элементов и данных мониторинга в натурных условиях. Определены зависимости горного давления на обделку от условий заложения (глубина, уклон трассы, прочность грунта, наличие тектонических напряжений). При выборе типа обделки и способа сооружения тоннеля предложено ориентироваться на предложенные автором шесть классов грунта по прочности и три типа условий по глубине заложения (в зависимости от наличия или отсутствия свода равновесия над тоннелем. Сравнение результатов расчета с данными натурных измерений показало хорошую сходимость (11,3%). Измеренное горизонтальное давление грунта оказалось больше расчетного, что для данного тоннеля связано с влиянием анизотропии грунта и горизонтальных тектонических напряжений.
Полный текст статьи публикуется в английской версии журнала
«Soil Mechanics and Foundation Engineering” vol.59, No.1

Determining the rock or soil pressure of a tunnel is a prerequisite for excavation and lining. A theoretical calculation and on-site monitoring of the soil pressure of Jinci tunnel was made combined with case studies. The data of soil pressure obtained by both means was compared and analyzed in this paper and the results showed that: (1) Depth had a significant influence on both failure mode and soil pressure. (2) Jinci Tunnel had a fifth grade surrounding soil. The theoretically calculated value of the vertical soil pressure was 11.3% greater than the measured one. The calculated value had a high reliability and can be used as the design load of the lining structure. (3) The calculated value of the horizontal soil pressure was 23.3% less than the measured one, due to the effect of horizontal tectonic stress and anisotropy of the soil. The research findings provided a method to determine the soil pressure of tunnels, and it can serve as a reference for similar projects.


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