... by both tensile and compressive stress. Relatively unstable parts of the URL are the bottom of the shaft, rotation parts of the -560m-platform and some corners. These parts should be paid attention to in the future excavation process. 1. Preface HLW refers to the waste produced by nuclear industry...

... Abstract In the recent years, the continuing trends has been towards to mechanization of shaft excavation operations. Mechanization offers safer, faster, more efficient, and more environment friendly operations in mining and tunneling. Raise Boring Machine (RBM) is one of the mechanical...

... in the North West Province of South Africa. Karee 3 Shaft (K3) is the largest of the 12 shafts on the Lonmin Marikana lease area. The shaft is able to hoist on average 12 400 t of UG2 and Merensky ore per day (285 200 t per month). The shallower reserves of both Merensky and UG2 Reefs have nearly been depleted...

... limits the use of this innovative concept. This manuscript will review the history of the use of unlined pressure tunnels / shafts in the world and presents prevailing design approaches in the use with the aid of the use of some very important cases of failures and successes where unlined / shotcrete...

... Abstract The main design principle of unlined pressure tunnels/shafts in a hydropower scheme is to provide sufficient confinement (minor principal stress) to withstand the internal hydrostatic water pressure. Rock support is only provided in areas where very weak rockmass is encountered...

... construction method. underground space ground condition pipe-roofing technology Reservoir Characterization micro-tunnel boring machine diameter Matsui rail transportation Shimada pipe shaft installation MTBM ground transportation isrm international symposium asian rock mechanics...

... station with ventilation located approximately at the center of the tunnel system. The construction started in 2014 and is ongoing until 2026. The emergency station, which is located at the toe of two 400 m deep shafts, requires the construction of large permanent caverns with dimensions in the range...

... Abstract Drilled shafts or bridge piers can transmit huge structural loads (both axial and lateral) through the overburden soil to the underlying rock mass. Drilled shafts are usually socketed into rock to increase their axial and lateral load carrying capacity. The part of the shaft, drilled...

... Abstract The depth of shafts tends to be deeper with that of shield tunnel because of the high utilization of underground space. On the other hand, there are few cases where shafts are constructed below 40m in depth. It is considered that the distribution of lateral earth pressure acting...

... in 2004 and the tunnels and stations have become in service since October 29, 2013. In this paper, the construction of an underground railway station (Sirkeci Station) in an urban area consisting of neighboring large-scale tunnels and shafts by means of NATM is reported. Sirkeci Station has two...

... Abstract The purpose of the study is application for construction and development of solutions to technical problems in order to ensure airtightness around the operation shaft plug. The technical problems on airtightness of the operation shaft plug are divided into the several risks as follows...

... Abstract This study addresses the influence of a fault on stress distribution and the stability of a concrete lining during sinking of a shaft thorough a large-scale fault at the Horonobe Underground Research Laboratory (URL) in Hokkaido, Japan. The project is being constructed by the Japan...

... tunnel ever designed in South Korea and using Drill & Blast excavation method. A total length of tunnel for light vehicles is 10.91km long including both open cut and tunnel sections and 4 ventilation shafts. Many design issues had been aroused during the preliminary design phase (i.e. a detail...

... and supporting surge shaft system. The aim of these excavations is balance between power plant and waterway system and also acts to prevent of water hammer. These shafts are located in the Bakhtiari Formation (Conglomerate rocks) and the Lhbary formation (conglomerate- silt Stone and clay stone with the thin...

... behavior, verify that the design loads did not exceed the design capacity, validate the design approach, and evaluate construction methods and thereby increase the reliability and efficiency of production drilled shaft construction operations. The additional borings exposed extensive geologic variability...

...-third loading were used. construction materials crack development shaft experimental result Reservoir Characterization CFRP sheet specimen loading central pump room anhui university metals & mining cfrp sheet 2300 120 0 application construction process carbon fibre Wellbore...

... ABSTRACT In this study, it was designed to examine the key factors as to the end-bearing capacity of drilled shaft based on the past studies, and furthermore to verify and visualize the effect on the factors systematically through the scaled model test, which has been well known...

... of underground spaces have been expanded. FLAC 2D and UDEC are successful softwares for such analyses. In this study, Siah-Bishe right pressure shaft has been modeled by FLAC 2D. Axisymmetry geometry with simple 3D model is used to account for the 3D shape of the shaft. One of the properties of this model is its...

.... There is a big rock (11.6m long, 2.3m wide and 0.7m high) at the shaft station of Panbei coal mine need to be removed, and it is very near to a coal seam. It can not be removed by blasting; therefore soundless cracking technique was chosen. Hundreds of holes were drilled with a diameter of 42mm, a depth of 500mm...

... in longitudinal direction. This paper presents a monitoring case study on double closer pipe jacking in Shanghai. The pipe jacking tunnels share one working shaft with 10.2m in diameter and 33.7m in depth, so that the net distance between two tunnels is only 0.48D and D is the outside diameter of tunnel...