2411-3336 2541-9404 Записки Горного института Journal of Mining Institute Санкт-Петербургский горный университет императрицы Екатерины ΙΙ Empress Catherine II Saint Petersburg Mining University JNNOAW pmi-15639 https://pmi.spmi.ru/pmi/article/view/15639 Геотехнология и инженерная геология Geotechnical Engineering and Engineering Geology Geomechanical analysis of the impact of the new tunnels construction in the vicinity of existing underground subway structures on the state of the soil massif Геомеханический анализ влияния строительства новых тоннелей в окрестности действующих подземных сооружений метрополитена на состояние грунтового массива Nabatov Vladimir V. Набатов В. В. Nabatov Vladimir V. nv4@mail.ru 0000-0002-0047-0462 Национальный исследовательский технологический университет «МИСиС» (Москва, Россия) National University of Science and Technology “MISIS” (Moscow, Russia) Voznesenskii Aleksandr S. Вознесенский А. С. Voznesenskii Aleksandr S. al48@mail.ru 0000-0003-0926-1808 Национальный исследовательский технологический университет «МИСиС» (Москва, Россия) National University of Science and Technology “MISIS” (Moscow, Russia) 13 09 2023 2023 264 926 936 27 10 2021 20 06 2023 25 12 2023 © Vladimir V. Nabatov, Aleksandr S. Voznesenskii 2023 В. В. Набатов, А. С. Вознесенский Vladimir V. Nabatov, Aleksandr S. Voznesenskii CC BY 4.0 https://pmi.spmi.ru/pmi/article/view/15639

Рассмотрена специфика поведения грунтового массива вблизи строящегося тоннеля в сложных горнотехнических условиях, выявленная благодаря совместной интерпретации результатов геофизических измерений в тоннеле и компьютерного моделирования. Описаны результаты полевых геофизических исследований, проводившихся для выявления областей разуплотненного грунта за обделкой в двух действующих тоннелях при последовательной проходке под ними двух новых тоннелей. Использовался метод анализа отклика обделки на ударное воздействие, предусматривающий вычисление его энергии. Установлено, что зоны разуплотнения в основном находятся в боковых нижних областях тоннеля. Для обоснования механизма образования полостей проведено компьютерное моделирование методом конечных элементов в системе COMSOL Multiphysics. Конечно-элементная модель построена на критерии Друкера – Прагера в варианте двухмерной постановки задачи. Показано, что при исходном положении двух старых тоннелей области разуплотнения могут развиваться в основном по бокам. При проходке новых двух тоннелей положение зон существенно меняется. Возникают зоны разуплотненных грунтов между тоннелями и наблюдается тенденция распространения областей к верхней точке тоннеля. По геофизическим данным отмечены временные задержки воздействия строящихся тоннелей на действующую линию, а также сокращение размеров областей разуплотненных пород со временем. Отмечается удовлетворительное совпадение положения областей разуплотнения и пустот, полученных геофизическим методом, с результатами численного моделирования.

The specificity of the behavior of the soil massif near the tunnel under construction in difficult mining conditions is considered. It was revealed through the joint interpretation of the results of geophysical measurements in the tunnel and computer simulation. The results of field geophysical studies to identify areas of decompacted soil behind the lining in two existing tunnels during successive drilling of two new tunnels under them are described. A method to analyze the response of the lining to impact was used providing for the calculation of its energy. It has been established that the decompaction zones are mainly located in the lateral lower areas of the tunnel. To substantiate the mechanism of formation of cavities, computer simulations were carried out using the finite element method with the COMSOL Multiphysics software. The finite element model is built on the Drucker – Prager criterion in the variant of a two-dimensional problem statement. It is shown that at the initial position of two old tunnels, the areas of decompaction can develop mainly on the sides. The position of the zones changes significantly when excavating two new tunnels. Soil decompaction zones appear between the tunnels and there is a tendency for the areas to spread to the upper point of the tunnel. According to geophysical data time delays in the impact of new tunnels on the existing line are noted, as well as a decrease in the size of decompacted soil areas over time. There is a satisfactory agreement between the positions of the decompaction areas and voids obtained by the geophysical method and the results of numerical simulation.

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