PSI - Issue 17

Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 17 (2019) 602–609

ICSI 2019 The 3rd International Conference on Structural Integrity The effect of cryogenic suction on the monitoring data of ice barrier formation in a porous water-saturated soil Plekhov O. a *, Panteleev I. a , Kostina A. a , Levin L. b a Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science, Perm 614013, Russia b Mining institute of the Ural Branch of Russian Academy of Sciences, Perm 614007, Russia Artificial ice wall formation is one of the most frequently used techniques for waterproofing of mineshafts constructed in water saturated rock massifs. In this work, we have developed a complex monitoring system for control of formation of ice. The system includes hydro-observation and temperature monitoring wells combined with simulation module. At the beginning of the monitoring process, we observed contradictory indications of ice wall closing moment by hydro-observation and temperature monitoring subsystems. To explain this effect we introduced in the simulation module two models of ground freezing, which consider the key effects observed under the phase transition in a saturated soil. There are existing of nonequilibrium moisture content in the soil at negative temperatures, kinetic peculiarities of water-ice transition in a porous medium and redistribution of moisture in partially saturated soil. Based on the detail simulation model we have shown that moisture content inside the closed ice wall can decrease due to water migration towards the phase transition front, which, consequently, slows down the water level in hydro-observation wells. ICSI 2019 The 3rd International Conference on Structural Integrity The effect of cryogenic suction on the monitoring data of ice barrier formation in a porous water-saturated soil Plekhov O. a *, Panteleev I. a , Kostina A. a , Levin L. b a Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science, Perm 614013, Russia b Mining institute of the Ural Branch of Russian Academy of Sciences, Perm 614007, Russia bstract Artificial ice wall formati is one of the most frequently used techniques for waterproofing of mineshafts constructed in water saturated rock ma ifs. In this work, we have developed a complex monitoring syste for control f formation of ice. The system includes hydro-observation and temperature monitoring wells combined with sim lation ule. At the beginni of the monitoring process, we s r contradictory indications of ice wall closing moment by hydro-observation and temperat monitori g subsystems. To xplain this ffect we introduced in the simulation module two models of grou freezing, which con ider the key effects observed und r the phase transition in a saturat d soil. There are existing of no equilibrium moistur content in the soil at negative te peratures, kinetic peculiarities of water-ice transition in a porous medium a d r distribution of moisture in p rtially saturated soil. Based on the detail simulation model we have shown that moisture content inside the closed ice wall can decrease due to water migration towards the phase transition front, which, consequently, slows down the water level in hydro-observation wells. Abstract

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. P er-review under responsibility of th ICSI 2019 rganizers. Keywords: artificial ground freezing, numerical simulation, frost heave, thermo-hydro-mechanical model

Keywords: artificial ground freezing, numerical simulation, frost heave, thermo-hydro-mechanical model

1. Introduction

1. Introduction

The study of the process of fluid migration in a porous medium has a long history, which dates back to 1920s, when Taber conducted the first experimental investigation of the process of lens formation during the propagation of the The study of the process of fluid migration in a porous medium has a long history, which dates back to 1920s, when Taber conducted the first experimental investigation of the process of lens formation during the propagation of the

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. * Corresponding author. Tel.: +7-342-237-8321; fax: +7-342-237-8487. E-mail address: poa@icmm.ru * Corresponding author. Tel.: +7-342-237-8321; fax: +7-342-237-8487. E-mail address: poa@icmm.ru

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.081