http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Panthi Krishna Kanta (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
Krishna Kanta Panthi 한국자원공학회 2015 Geosystem engineering Vol.18 No.1
In recent past, the development activity in hydropower sector got momentum in theHimalayan region. However, the investment cost is considered considerably higher than in other part of the world, and there is a strong need to look for alternative solutions that reduces the investment cost.Civil engineering part of the costs is one of themajor areaswhere cost reductions could bemade by involving today’s construction technology. As it is well known, the use of underground space, such as waterway tunnels, shafts, and underground caverns, are inevitable in the development of hydropower projects in the Himalaya. Finding innovative solutions in underground construction is therefore a key issue where cost reductions can be achieved to improve financial viability. It is highlighted here that the traditionally used fully concrete linedwaterway systemhas proven to be costly solutions; therefore, innovative solutions are needed to reduce the fully concrete lined length of the pressure tunnels. However, applied solutions must guarantee long-term stability and sustainability, cost-effectiveness, and construction time savings. This paper presents some design considerations that could be used to reduce fully concrete lined tunnel length for low to medium pressure waterway tunnels. Adoption of such an approach will help reduce overall construction costs and times. However, one should make sure that the prevailing rockmass conditions and applied tunnel rock support consisting of sprayed concrete and systematic bolting are enough to secure long-term stability and safety of the waterway system.
-
Basnet Chhatra Bahadur,Panthi Krishna Kanta 한국자원공학회 2021 Geosystem engineering Vol.24 No.1
The Himalayan region is renowned with its complex topography and active tectonic movement, which causes accumulation and sudden release of strain energy instigating changes in the in-situ stress state. This paper evaluates in-situ stress state at the Upper Tamakoshi Hydroelectric Project where shotcrete lined headrace tunnel with considerable hydrostatic head is being implemented. Start of the pressure tunnel at the downstream-end was proposed inside slope topography of about 300 m above valley bottom based on in-situ stresses measured by 3D overcoring at the test tunnel located at valley level. It was believed that pressure tunnel start location with a hydrostatic head of 420 m was inferred to have almost similar in-situ stress state measured at the test tunnel. However, minimum principal stresses measured by hydraulic fracturing were found insufficient to avoid hydraulic jacking. This manuscript evaluates in-situ stress state of the area and explores reasons behind much lower stresses than expected. Detailed assessment of the stress state using both measured data and 3D numerical analysis is performed, which revealed that the stress state has high degree of spatial variation even at similar overburden conditions. The analysis further demonstrates that presence of local shear zone has considerable de-stressing effect.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
