West Taiwan Corridor High Speed Rail is 345 km in length and has various guideway structures including viaducts/bridges, tunnels, embankments/cuts. Geotechnical techniques are widely applied , for example, the embankment fill , cut excavation, slope protection, tunnel excavation, foundation construction, ground improvement, etc. The geological condition along the proposed alignment at the north section can be divided into two categories, interbedding of sandstone and mudstone, and gravel formation (conglomerate); at the south section, it is composed mainly of recent alluvium of silty clay, silty sand and their interbedding. It is important to adopt appropriate geotechnical techniques to construct with different characteristics structures. Therefore, the quality, cost and schedule of High Speed Rail construction can be fully ensured or optimized.
The Pinglin Tunnel, including two main tubes with 12m in diameter and one pilot tube with 5m in diameter, is approximately 12.9km long. The maximum overburden is approximately 720m and the geological structure along the tunnel is very complicated with large amount of ground water. Therefore the geotechnical consideration is very important and should be carefully studied and evaluated. This paper is to introduce the key issues regarding geotechnical engineering during planning and design stages. The actual results during construction is also interpreted to compare with the anticipative condition in the planning and design stages.
The South Link Railway located in the southern part of Taiwan is the last section of Taiwan‘s Round-the-Island Railway System, with total length 98.248Km, The route goes from west coast through central mountain areas to the east, following the edge of steep cliffs along the coast. A series of 35 tunnels totaling 38.924Km long and 188 bridges totaling 10.736Km long , cover more than half length of this line. In the beginning, construction was frustrated by extremely difficult geology and many other unforeseen problems. After long struggle and intensive research, newly developed geotechnics and materials were adopted. Thanks to the technical assistance from consultants and experts, the difficult problems were finally resolved. This project was completed and opened for public at the end of 1991.
In this paper, the solution measures are collected and the problems are reviewed. The objective of this presentation is to provide help and reference to all who are concerned when similar problems are encountered in the future.
The tunnel construction underneath Hsinten river is a key part of underground railway in Wanhua-Panchiao project. The engineering process was influenced by uncertain factors such as weather and flood condition. During the construction period, the flood control of Taipei Basin area, the safety of railway bridge 3, and stream erosions should be considered. This engineering project is very complicated and challenging.
The factors which influence the tunnel construction methods were reviewed in this paper.
This paper discusses the application of shield tunneling technique in the soft ground condition of Taipei Metropolitan Area, especially focusing on the solution of a shield machine which was entrapped and damaged due to the unforeseen complex strata and embedded large boulders.This was solved by manually excavation with the application of combined soil improvement and compressed air.
Fu Shing North Road underpass is situated directly beneath the Song San airport in Taipei city. As the soil encountered in this underpass project is medium to highly sensitive clay, construction method should be carefully selected in order to minimize any possible ground deformation that might endanger fly safety and normal operation of airport.
The combination of pipe roof and ESA method is chosen for this project after elaborative consideration. In this paper, the author will explain the benefits of utilizing ESA method for this project. Special interest focusing on ground deformation, directly resulted from key construction components, such as work shaft, ground improvement, pipe roof and ESA method, is also given in this paper. In the end, the authors will introduce some feasible measurements and suggest quality control and monitoring program which may prevent settlement during all stages of the construction.
The safety of reservoir not only affects its operation functions and huge financial benefit but also the safety of human life and property for people living downstream. Therefore, the governments in the developed countries pay great emphasis on the safety of the reservoir. This paper describes the policy and guidelines for reservoir safety issued by the government. It also discusses the geotechnical issues in the safety evaluation of earth dam, including (1) main items in field safety inspection, defect indications, possible causes and potential effects; (2) monitoring program, results evaluation and determination of safety warning level of monitoring data; and (3) the current practice of seismic safety evaluation of earth dam.
For the planning, design and construction of large plants on a reclaimed land in west coast of Taiwan, the geotechnical engineering experiences on site investigation, liquefaction analysis for various fine contents, soil improvement by dynamic consolidation, consideration of settlements due to dredge fill, facility load distribution,shallow and deep well pumping, unusual behavior of pile foundation together with its analysis and construction are presented in this paper.