КОМПЛЕКСНЫЕ ИССЛЕДОВАНИЯ ЗАКРЕПЛЯЮЩЕГО СОСТАВА ПРЕДНАПРЯЖЕННЫХ АНКЕРОВ В ВОДОНАСЫЩЕННЫХ ГРУНТАХ ПРИ ПРОХОДКЕ ГИДРОТЕХНИЧЕСКОГО ТОННЕЛЯ Research on combination test of high pretension cable anchor anchoring agent for surrounding rock with diverse water-rich states in Haidong tunnel

Xiaotian Lei, Zhigang Tao, Keyuan Liu, Ruixue Zhang, Mingjiu Cai, Xiaowei Fan

Аннотация


Дается краткий обзор исследований и приводятся результаты собственных исследований по креплению тоннельной выработки в водонасыщенных песчаных грунтах предварительно напряженными анкерами, как альтернативы традиционного крепления стальными арками, торкретированием и устройством вторичной бетонной обделки. Испытывались канатные анкера, напряжение которых создавалось натяжением стальных тросов, расположенных в заполненной смолой оболочке. Выяснилось, что свойства смолы существенно влияют на изменение величины натяжения троса: чем быстрее схватывается и набирает прочность смола, тем большую нагрузку выдерживает анкер. Приводятся результаты экспериментальных исследований по определению оптимальной комбинации закрепляющего состава (свойств смолы) и величины натяжения стального троса в зависимости от свойств грунта и обводненности. Подробно описывается методика экспериментов, приводятся зависимости для оценки усилия натяжения анкерного троса и критерии оценки надежности закрепления. Результаты показывают, что по мере увеличения дренажной способности скважины быстросхватывающийся анкерный раствор дает неоспоримые преимущества, хотя и с ограниченной способностью контролировать фильтрацию. Предложены оптимизированная схема комбинирования затирки и двухуровневый критерий раннего предупреждения для обеспечения технической поддержки для данного тоннеля и аналогичных проектов, связанных с большим количеством воды в тоннелях.


Полный текст статьи публикуется в английской версии журнала
«Soil Mechanics and Foundation Engineering”, vol.63, No.2


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