TY - JOUR AU - Koji Watanabe, AU - Akira Mitsumori, AU - Hidetoshi Nishioka, AU - Masayuki Koda, PY - 2017/10/05 Y2 - 2024/03/29 TI - EVALUATION OF HEAVING RESISTANCE FOR DEEP SHAFT USING NODULAR DIAPHRAGM WALL JF - GEOMATE Journal JA - INTERNATIONAL JOURNAL OF GEOMATE VL - 14 IS - 46 SE - Articles DO - UR - https://geomatejournal.com/geomate/article/view/2823 SP - 40-45 AB - <p>In recent years, an increasing number of plans in Japan have been proposed for large-scale<br>railway structures to be built deep underground. To construct a large-scale railway structure, it is necessary to<br>construct vertical shafts that serve as the starting and ending point for the shield machine during the<br>construction as well as the air vents once it goes into operation. In such situations, it is expected that there<br>will be an increase in the cases where the vertical shafts will be built to reach deep underground. If typical<br>diaphragm walls were used to construct these deep shafts, the embedment depth of the diaphragm walls<br>would have to be made substantially significant in order to control the heaving. Heaving as stated here is a<br>phenomenon in which pressurized water contained in the permeable layer below the impermeable layer close<br>to the bottom of the excavated ground breaks through the impermeable layer owing to the upward force of<br>the water pressure during the excavation process, which then causes the vertical shaft to lose its stability.<br>Using nodular diaphragm walls that have nodular part on the diaphragm walls of the deep shaft could be<br>relied upon for the purpose of supporting the embedment depth of the diaphragm walls. In this research, the<br>influence the nodular part resistivity was examined in resisting heaving when nodular diaphragm walls are<br>used for the deep shaft. The experiments at gravitational and centrifuge acceleration fields were conducted,<br>and their effectiveness were confirmed.<br><br></p> ER -