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RISS 인기검색어
- 검색키워드
- 저자 : Rajinder Bhasin (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Bhasin, Rajinder,Aarset, Arnstein Korean Tunnelling and Underground Space Associatio 2020 자연, 터널 그리고 지하공간 Vol.22 No.1
Tunnelling to bypass major landslide areas is considered as a good and long-term environmentally friendly solution to reduce an existing hazard. In Norway, hundreds of kilometres of tunnels have been constructed in areas prone to landslides and snow avalanches. Although tunnelling is considered as an expensive mitigation strategy for bypassing landslides, analysis indicate that in some cases the cost of building a tunnel can be repaid by savings in driving costs (fuel) alone over a period of 5-10 years due to reduced driving distances. The other benefits of constructing tunnels in landslide areas include savings in time and increased safety. The Norwegian Method of Tunnelling (NMT) is considered safe, efficient and cost effective compared to other tunnelling techniques. Some aspects of NMT, which are considered safe and cost efficient, are presented. The application of updated rock support techniques, including reinforced ribs of shotctrete (RRS), which is a key component of the Norwegian Method of Tunnelling (NMT), is highlighted.
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Rajinder Bhasin,Thomas Pabst 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.3
Numerical simulations have been performed to assess the stability of a large underground powerhouse in the Himalayas, using bothfinite element and distinct element approaches. Large convergences (around 250-300 mm) along the 45 m high wall of the MachineHall have been measured by total station measurements during construction and up to 60 mm in the post construction and operationalphase. Displacements are continuing at a reduced rate of about 3 to 6 mm per year. A large number of rock bolts have failed in thepowerhouse and the shotcrete liner presents cracks and failure marks, thus questioning the long-term integrity and stability of theexisting rock support system. The purpose of the numerical analysis was to back-calculate the prevailing rock mass conditionssurrounding the machine hall, thereby gaining a better understanding of the mechanisms responsible for the instability in the cavern. The results from the analysis indicate that there was possibly an underestimation of the rock support requirements needed for thecavern, coupled with a not so good installation (incomplete grouting of the bolts). Both the length and the capacity of the rock boltswere underestimated presumably due to the existence of a high stress regime in the area, which may not have been taken intoconsideration in the design of rock support. The effect of a possible earthquake, frequent in this area, has also been studied and provesto induce a significant increase of the displacements and the support failure.
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