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New Hydro-Mechanical Tunnel Excavation Method Using an Abrasive Waterjet System

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New Hydro-Mechanical Tunnel Excavation Method Using an Abrasive Waterjet System Japanese Geotechnical Society Special Publication The 6th Japan-Korea Geotechnical Workshop New hydro-mechanical tunnel excavation method using an abrasive waterjet system Gye-Chun Cho i), Gun-Wook Joo ii), Tae-Min Ohiii), and Eun-Soo Hongⅳ) i) Professor, Department of Civil and Environmental Engineering, KAIST, 291, Daehak-ro, Daejeon 305-338, Republic of Korea. ii) Ph.D. Student, Department of Civil and Environmental Engineering, KAIST, 291, Daehak-ro, Daejeon 305-338, Republic of Korea. iii) Senior Researcher, Underground Space Department, KIGAM, 124, Gwahang-ro, Daejeon 305-350, Republic of Korea. ⅳ) Research Associate Professor, Department of Civil and Environmental Engineering, KAIST, 291, Daehak-ro, Daejeon 305-338, Republic of Korea. ABSTRACT Tunnel excavations in urban areas are highly restricted by the need to control the blasting vibration level and obtain rapid excavation. A new tunnel excavation method using an abrasive waterjet (AWJ) system assisted by mechanical excavation tools is now under development for efficiently creating tunnels and underground spaces, such as generating a continuous free surface on the tunnel’s perimeter. This artificial continuous free surface can increase the efficiency of the excavation rate and even enhance the excavation rate at various free surface conditions. In this study, an in-situ experimental test was performed to verify the free surface effects on excavation performance. A continuous free surface is generated using an abrasive waterjet system. Mechanical excavation tools (drilling jumbo or hydraulic rock breaker) are utilized to excavate the remaining tunnel face. According to the in-situ experimental results, we expect that this new tunnel excavation method can be effectively utilized as baseline data for establishing new alternative tunneling methods in various construction locations, such as short tunnels near urban areas, utility tunnels, and shafts Keywords: tunneling, abrasive waterjet, mechanical excavation tool, hard rock excavation 1 INTRODUCTION etc. The waterjet commonly has to travel some distance Hard rock excavation in urban areas is a significant to the target material, which is usually referred to as the challenge owing to unacceptable excavation vibration standoff distance. A long standoff distance reduces the levels and the necessity of rapid excavations. depth of the cut and depresses the waterjet’s effective Conventional blasting methods and/or the use of a energy (Kovacevic, 1992). Free surface generated by an tunnel boring machine (TBM) are broadly utilized at AWJ system on a tunnel’s perimeter diminishes present. However, conventional blasting methods vibration propagation compared with the conventional cannot prevent the propagation of blasting vibration, blasting methods (e.g., the New Australian Tunneling while the TBM method is not appropriate for mixed Method) by generating a free surface line on the tunnel ground conditions or short tunnels. Therefore, the face (Oh et al., 2012). development of a new tunnel excavation method is We introduces a new hydro-mechanical tunnel necessary to constructing tunnels and underground excavation method using an abrasive waterjet system in spaces efficiently and with fewer restrictions. which the abrasive waterjet system generates High pressurized waterjet systems are used in continuous free surfaces on the tunnel’s pay line. various industries like machining and mining (Summers, Several experimental tests were performed to verify the 1995). The waterjet system is now an emerging free surface effects. First, continuous free surfaces were technology being used not only in the machining and generated using the abrasive waterjet system; several mining fields but also in the civil engineering field, sets of penetrating hole-spacing conditions next to the especially in tunneling. Rock cutting using an abrasive free surface were generated using a drilling jumbo waterjet (AWJ) has been in use in recent years. Hlavac machine. Then a hydraulic hammer or hydraulic rock et al. (2009) performed an experimental test for granite splitter was used to gradually excavate the areas closest and marble specimens which investigated the optimized to the free surface. We evaluated the efficiency of each parameters for obtaining high AWJ cutting quality. method’s excavation efficiency with a construction There considered several waterjet cutting parameters: process and measurement of rock fragmentation size. water pressure, water flow rate, traverse rate, stand-off distance, nozzle or focusing nozzle type, nozzle contact angle, abrasive type, abrasive size or its distribution, http://doi.org/10.3208/jgssp.v04.k06 132 2 EXPERIMENTAL PROGRAM 2.2 Experimental procedures Several in-situ tests were performed in a quarry in 2.1 Test setup which the rock mass composition was predominantly A waterjet using single nozzle system was granite with a uniaxial compressive strength of 120-200 implemented by high water-pressure with various water MPa and rock mass rating (RMR) value of 87 (that is, flow rates and traverse rates. For this test we used a very good rock). The rock excavation method using an diesel plunger pump, which can generate a high water abrasive waterjet system that was developed in our flow rate. The pump's power was 600 HP and the study for alternate blasting method to the conventional maximum water flow rate was approximately 80 l/min method. This system is composed of a pump carriage at 250 MPa. For the orifice and focusing nozzle parts, and an excavation carriage (Fig. 2). A free surface line four different sizes of sapphire orifices (inner diameters can be generated using the excavation carriage and the of 0.64, 0.71, 0.89, 1.02 mm) were utilized in this test; blasting vibration will be trapped along the free surface the water flow rate reached 9.58, 12.02, 18.78, 24.53 line. The abrasive waterjet-aided rock excavation l/min/ea at 250 MPa, and the focusing nozzle inner method is distinguished from the conventional blasting diameter was 2.29 mm. Figure 1(a) shows that the method only by the presence of the free surface on the waterjet nozzle traverse system can be operated at the tunnel face. The new system consists of a high pressure same standoff distance conditions (50 mm for a single water pump, a tank to supply the abrasive, a nozzle nozzle system, 300 mm for a dual nozzle system) for a mount, and a rig to move the nozzle. The type of pump given traverse rate. Water pipes supplied the high used (plunger, 600 HP) can generate high water pressurized water and abrasive pipes entrained the pressure (up to 280 MPa); 250 MPa was used for abrasives inside the nozzle mixing chamber using cutting in this study. This high pressurized water flow induced suction pressures (e.g., abrasive injection type). was mixed with abrasive particles supplied from an In addition, the main abrasive tank supplied its own air abrasive supply tank and projected towards the target pressure to the abrasive particles which were surface through the nozzle mount. The abrasive was transported through the pipe line, and a sub-abrasive 40-mesh garnet particles. tank supplied the abrasive by high pressurized suction pressure, as shown in Figure 1(d). As the abrasive for this experiment, we used small garnet particles; the Horizontal excavation Free-surface line abrasive properties are shown in Table. 1. The granite Pump carriage Excavation carriage specimens were prepared (quarried from the Tunnelface Hwang-Deung region in Korea) with the physical Blasting properties of the specimen as follows: dry density of 26.66 kN/m3, porosity of 0.68%, absorption ratio of 0.25%, and uniaxial compressive strength of 208.5 MPa. The dimensions were as follows: thickness of 400 mm, Fig. 2. Tunnel excavation method using an AWJ system. width of 400 mm, and length of 1500 mm. 2.3 Mechanical excavation tools Several in-situ tests were performed using mechanical excavation tools, such as a hydraulic hammer and a hydraulic rock splitter, after generating a clear free surface line on the tunnel’s perimeter. The hydraulic hammer is a powerful percussion hammer fitted to an excavator for demolishing concrete structures or rocks. The system is operated by an auxiliary hydraulic system from the excavator. The hydraulic splitter is a type of portable hydraulic tool that is used in demolition jobs that involve breaking large blocks of concrete and rock mass. Hydraulic rock splitters consist of two wedges that are inserted in a pre-drilled hole, and several hydraulic cylinders push Fig. 1. Components of the abrasive waterjet system. out a center point between the two side cylinders, Table 1. Abrasive properties. forcing them to separate (sufficient tensile strength for Hardness rock splitting procedures must be applied). Component Specific gravity Particle size (Mohs scale) Mg3Al2Si3O12 6.5~7.5 3.1~4.3 30~200 mesh (pyrope garnet) 133 3 SUGGESTION OF A NEW TUNNEL 3.1 Abrasive waterjet system combined with EXCAVATION METHOD USING AN AWJ hydraulic hammer SYSTEM ASSISTED BY MECHANICAL TOOLS A hydraulic hammer or a hydraulic impact hammer can excavate large areas of brittle material such as rock Hard rock excavation in urban areas is quite a mass in mining or tunneling. Excavation by a common challenge owing to unacceptable levels of excavation method by using hydraulic hammer is usually vibration and the necessity of rapid excavations. excavated from the center point to outer points on the Conventional blasting methods and/or the use of a tunnel’s bottom line. This method grows the size of the tunnel boring machine (TBM) are broadly utilized at slotting hole by sequential and repetitive excavation present. However, conventional blasting methods procedures. However, in this study, our excavation cannot prevent the propagation of blasting vibration, method is totally the opposite of the above traditional while the TBM method is not appropriate for mixed method. First, we generated the continuous free surface ground conditions or short tunnels. Therefore, the on the tunnel’s perimeter and also generated several development of a new tunnel excavation method is drilling holes using a drilling jumbo machine.
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