Research conclusions: The core technology of the RCESDSS is the integration of GIS with DSS along with experiences of railway construction environmental supervision and the environment protection technology of railway. In this way, the RCESDSS can process the feature-spatial data and has powerful decision-making support function. The establishment of this system can provide visual decision-making support for environmental supervisor.

Research conclusions: (1) SAR interferometry has some unique advantages, and is suitable for the DEM with various range, high precision and high resolution. (2) The technology has huge application potentiality for railway survey and design, railway geologic disaster and roadbed deformation monitoring of Qinghai-Tibet Railway in permafrost zone.

Research conclusions: The different statistics methods are needed to calculate the distribution of wind-force monitoring spots according to the different climate conditions. To monsoon climate, the extremal I distribution should be taken as the basis, to typhoon climate, the Peason III distribution should be taken as the basis, and to mixed climate, first of all, the dominant climate should be determined, then the relative statistics method should be selected.

Research results: The geological route selection between Semai-Dazhuca of Lhasa-Rikaze Railway has the features of route selection in plateau mountain and valley area, so it is necessary to take the unique geographic environment and climate characteristics into account in route selection. Through making analyses and doing researches, one safe, rational and feasible route program is selected, which can save much construction cost.

Research Conclusions: The karsts encountered in the construction can be divided into four types according to the engineering-geological, characteristics, namely cave type, fluid bowl type, pipe type and large-sized karsts, and they can be divided further according to the hydro-geological characteristics, namely free filling type, semi-filling type, filling type, flow type, overflow type and underground river type. For the kasrst cave, the reinforcing measures of filling, refilling and grouting can be taken, for fluid bowl, the reinforcing measures of filling guard arch, supporting the excavated area and grouting can be taken , for the karst pipe, the reinforcing measures of filling guard arch, drainage in advance, grouting; support with large pipe shed and remaining the existing drainage system can be taken, and for large-sized karst; the reinforcing measures of filling guard arch; grouting and support with large pipe shed can be taken for the upper and steel pipe pile, slab and beam crossing the tunnel; cap of pile trestle and filling subgrade can be taken for the bottom.

Research conclusions: It is proposed that in the geological forecast in advance for tunnel, TSP203 System should be taken as principal means along with other geophysical prospecting methods, geological sketch in details and level drilling in advance #ox supplementing and verifying each other.

Research results: The paper extractes the characteristics of the railway disease in permafrost region. And according to the particularity of the plateau permafrost, the paper extractes corresponding subgrade maintaining measure and maintenance contents. Considering the peculiarity of the plateau permafrost, we put forward emergency measures for some subgrade diseases. At last, the paper advances corresponding suggestions about the railway subgrade's conserving measures of the Qinghai-Tibet plateau permafrost region.

Research conclusions: The method of generally determining differential compensative load for scatteredload anchor rope in the course of tension presented in this paper is suitable for all kinds of seatteredload anchor rope with a perfect applicability. Before the anchor rope is tensioned integrally, the anchor rods of each unit can be stressed evenly by tensioning all anchor rods to design tension loads after compensatively tensioning all anchor ropes of each unit in order from beginning with long anchor rope unit at bottom. The anchorage stress on the anchor zone after the anchor rope is tensioned is close to the design anchorage stress with consideration of, the deformation of anchor rod of each unit under condition of friction.

Research results: The manually auxiliary maintenance should be done to the transplanted turf, which is helpful for the turf's growth. The basically same outcome can be obtained as that from integrally transplant by transplanting the 15cm upper part of turf. The 15cm-17cm interval between turfs is the most favourable for the turf's growth, because turf has a perfect growing capacity. The research outcome has been applied in the environment recover project for Qinghai-Tibet Railway, which has brought about remarkable social and economic benefits.

Research results: In this paper, the explanation is given to the working principle of anchor wire dynamic meter and the analyses of the change characteristics and loose of anchoring prestress in the cause of prestressed anchor wire dynamic meter being tensioned and after it being locked so as to show the effects of anchor wire dynamic meter in anchor wire engineering and monitoring reinforcement of side slope.

Research results: The analytical results show that the regular waveforms in track random irregularities, such as sine wave and triangular wave, could be identified with wavelet method. The high frequency defects on local rail could be checked better with wavelet method. Thought wavelet, the obvious track irregularities (characteristic track irregularities) in every range wavelength could be recognized, which is helpful for making more analysis of these track irregularities. So, analysis of track irregularities from the time-frequency point of view with wavelets is a new technical method for guaranteeing the safe running of railway.

Research Conclusions: From the analyses of this extremely large water bursting, it can be seen it is suitable for draining the water in dissolved chamber connecting with underground river, but not for blocking it. Sluice culvert can be used if the water is large. It is proposed the sluice culvert of about 400m can be excavated at the outside of the tunnel, which has the same effects as Mengping Underground River. In this way, there is no bad influence on environment and the water height can be lowered, which can guarantee safe construction of tunnel and eliminate the latent danger. It is also proposed cap of pile trestle can be used for the dissolved chamber crossing tunnel with plate arch because the rocks around the chamber are complete with good stability and width of 11m.

Research conclusions: The effective highness and eccentricity of the contacting face of duct piece joint have big influences on flexural rigidity of duct piece joint, so it is an effective way to change the structure size for adjusting flexural rigidity of duct piece joint in design of duct piece structure.

Research results: It is necessary to take the different construction auxiliary measures from those for construction of tunnel main portal because of complicated landform of tunnel face, bad geological conditions and complicated stressed status of structure when the start tunneling is conducted for the tunnel with big cross section and cutting face. Some commonly used methods for start tunneling are presented, such as big pipe shed method, spreading cut and cover tunneling method, little pilot hole reverse construction method and counter pressure on strata method, and the analyses of start tunneling of the tunnel with big cross section and cutting face are made in combination with the construction practice in this paper.

Research conclusions: The multi-yield surface model has its popularity and flexibility to describe the characteristic of the soil mass and the previous calculation with the multi-yield surface model fovoured safety.

Research conclusions: The key points of suspension in low headroom tunnel are how to use the low headroom and satisfy all technical standards along with consideration of the saving materials and construction cost. There are different resolutions to the different headroom tunnels, it depends on the site conditions to adopt the resolution.

Research conclusions: The typical construction practices at home and abroad show shielding machine has its own advantages of rapid and safe shielding when the engineering geological conditions fit to usage of shielding machine. But shielding machine will lose its advantages or cause the losses in construction schedules and cost if the geological conditions are not made clear or don’t fit to usage of shielding machine. These are the most basic norms of technical guidance.

Research conclusions: The equipments in control center are configured more perfectly, the power supply scheme of the switch station is more reasonable, the problem of channels is solved rationally, the video supervisory control system is applied for the Cast time, and the shortage in measuring distance for failure is pointed out. Moreover, the electric power equipments are indoor ones and all the incoming and outgoing lines are cables. The practical operation has been proved that all performances indexes of system can satisfy the design requirements with stable and reliable operation.

Research conclusions: The main reason for the boosting caused by extinction. coil is that the imbalance degree of wire-to-earth capacity is over high. The ideal resolution is to replace extinction coil of SHEBU transformer with the one that can automatically trace and adjust the compensative current.

Research conclusions: The risk in joint development project with government has the features of systematism, relativity and variety that are different from those in ordinary development project. In the joint development project with government, the great effects should be made on dealing with the policy change risk, the government trust risk, market risk etc.

Research conclusions: The innovative practice of application of BT Mode in financing for Olympic Metro Line of Beijing Metro plays a promotive role in the, long-term development of the enterprise. The law system should he established and the taxing system and investment management system should be defined to BT Mode applied in construction.