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Advantages of employing multilevel monitoring wells for design of tunnels subjected to multi-aquifer alluvial

Journal of Mountain Science 2021年第1期18卷 219-232页

作者： mohsen golian Ebrahim SHARIFI TESHNIZI Hamed TAVASOLI ROSTAMI Homayoon KATIBEH Mario PARISE Masoud MAHDAD Habib SAADAT Mehdi ABBASI Mahshid EBAD ARDESTANI Tehran Science and Research Branch Islamic Azad UniversityTehran ***Iran Department of Geology Faculty of SciencesFerdowsi UniversityMashhad 917751436Iran Mining and Metallurgical Engineering Department Amirkabir University of Technology(Tehran Polytechnic)Tehran ***Iran Earth and Environmental Sciences Department University Aldo MoroBari 70121Italy Iran University of Science and Technology Tehran ***Iran Shiraz University Shiraz ***Iran

For tunnels being excavated through multiple knowledge of the aquifers’hydraulic head becomes essential for determining groundwater inflow into the tunnel and analyzing its stability,specifically using multilevel monitoring *** the multi-aquifer alluvial section of the Glas tunnel(Iran),since the hydraulic head calculations were based on the data obtained from single-piezometer boreholes,the excavation risk was assessed to be at high level and the tunnel seemed to be unstable,thus an incorrect conclusion was derived from the misleading *** take cost mitigation measures into account,it was necessary to calculate the hydraulic head at tunnel level *** installing nested and clustered wells the mean hydraulic head was measured to be 70 m,significantly different from the 90 m previously determined by *** the updated value,the groundwater inflow and bulkhead load,formerly calculated as 0.65 m^(3)/s and 9.5 bars,were determined to be 0.49 m^(3)/s and 7.5 bars,respectively.

关键词： Nested wells Clustered wells Hydraulic head Pumping test Mechanized tunneling Iran

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