Research Conclusions:With a series of institution arrangement and realistic technological methods, the railway has make great progress in optimizing the energy consumption structure and further lowering the unit energy consumption. Railway has huge latent to save energy. The improving technological path concentrates on the two sectors. One is to further implement the project of substituting the electricity for oil and the other is to change the production increasing way and energy consuming way with the technical methods of the transportation institutional adjustment, etc.

Research results: Based on the summary on influence of understructure work construction on ground water environmental and taking the Line 2 of Xi ˊan City Rail Communication as an example , the influence of foundation pit precipitation in construction period on the groundwater environment is calculated with empirical formula and the influence on the flow field of groundwater after metro operation is predicated with the numerical simulation the method. However, the foundation pit precipitation only occurred in the Zhang Village station with the central water level dropping 6. 3 m, the precipitation of 10 454. 15 m3/d and influencing radius of 441 m. This will have certain influence on the ground-water flow because the underwater flow mute will be dammed by the metro track, resulting in head water raising and rear water lowering with simulation change amplitude of underground water level between 0～1.7 m.

Research results: Three quantitative indexes were put forth such as the fitness between urban rail transit network middle and city gravity centre, the fractal dimension identity between urban rail transit network and urban form, and the direction coordination between urban rail transit and city developing. Based on these quantitative indexes, a compositive coordination index was built to quantitatively analyze the coordination between rail transit network configuration and urban form. Take Xi an urban rail transit network planning for instance , the coordination between it is four pre-selection networks and urban form was analyzed. These compositive coordination indexes of four pre-selection network were 0. 7829，0. 7778 , 0. 6908 , 0. 7849 , the computing results showed that the forth network is the best one.

Research conclusions: In the high altitude control surveying of the railway construction , distortion of reductions of elevation is mainly in the length deformation. So , it is the best choice to select the level surface with compensation used as plane of projection,and build an independent coordinates system based on the orthomorphic projection 3°bands. The method is simple conversion, furthermore, the result of calculated coordinates is very close to the coordinates in the original coordinate system of national unity. It is helpful for the link between inside and outside of the surveying area. If the line length has a wide span from east to west, and when the center of the surveying area is far from the central meridian, we should consider selecting” any local projective stripes" or other methods.

Research conclusions: From the viewpoint of energy, the passive temperature requires no power and no moving mechanical parts during operation, which is the most commonly used technology for frozen soils temperature control. On the contrary, the active temperature control requires power to operate or has moving parts in temperature control system. The most distinct features of the two methods are that whether the freezing process can be controlled and whether need any support to energy consumption. For some calculation of frozen soils temperature control, there are a lot of formulas and charts obtained in long time, which can be used, but if it wants a more precise calculation, it needs simulation with some mature models.

Research results: The paper, basil on the systematic analysis and research, advances heat transfer theory of ventilation pipeline embankment in permafrost regions of Qinghai-Tibet plateau. The author thought the ventilation pipeline embankment has three heat transfer mode, namely, forced convection air, natural convection heat transfer and heart exchange. And the maximum effectiveness of a reasonable length and pathway was gained through theoretical calculations and test results in permafrost regions of Qinghai-Tibet plateau.

Research conclusions: The influence of the stability by the collar beam for the double-shaft and thin-wall high-rise pier is preliminarily given; the collar-beam is making a larger contribution to the straight forward stability for the bridge, and has little effect for the lateral stability; increasing the collar-beam between the thin-wall piers , the contribution for the stability comes to the stabilization. The collar-beam between the thin-wall piers is effectively increasing the stability for the double-shaft and thin-wall high-rise pier bridge, but after a certain extent, increasing the numbers of the collar-beam is not apparent.

Research conclusions: The simulation load analysis to the box cofferdam with solid65 element can solve the unit freedom coupling of the reinforcement concrete mixed materials effectively and perfectly simulate the dimension, space location, connecting conditions, edge conditions and space carrying state to provide high exact value model for the structural optimum and high exact value for the construction.

Research conclusions: ln a certain phase difference, when considering the one-way trip to the wave effect and three orthogonal traveling wave effect, internal forces and displacement of the structure both change cyclically, with natural cycle the same basically. At the same time, traveling wave effect results a significant impact on the response peak to the earthquake for the cable-stayed bridge with support system.

Research Conclusions:Taking the shield construction of bidding 19 of Line 4 of Beijing metro as an example, this paper analyzes the stratum stress change caused by the excavation and the displacement caused by stratum loss with the monitoring and measurement on the site. The results of analysis and measurement show the deformations can be controlled in the prescribed limit if the parameters of soil pressure, synchronic grouting and boring speed are decided rationally and an effective soil pressure balance is established.

Research conclusions: If the most substances in water and mud bursting are mud and sand, it is difficult for pumping water to treat water and mud bursting. In this case, the water stopping plug should be adopted to treat water and mud bursting. Based on the verification of the shearing force, the plug length should be designed according to the characters of water and mud bursting and grouting mechanism. The medium of the water and mud bursting in the Maluqing Tunnel is the cohesive soil and water, so the grouting mechanism should has the hustle-sediment action, the hydrate- concretion action and the float - sediment action in the cement concretion by the effect of the rainfall and the disconnected grouting. Therefore，the length of the water stopping plug must be of 10-20 times of the hole diameter.

Research results:The tunnel entrance construction should be based on site topography，geology, hydrology, from the environmental point of view, to develop a scientific and rational program hole, using a reasonable construction technology, methods and steps to carry out the construction. The paper explains that the long-span tunnel construction method should be changed into the small-span method(such as CD method, CRD method, etc.)and auxiliary construction methods(such as ring type excavation with conservation of core soil, advanced entrance construction method, etc.)，so as to effectively solve the potential safety problems and environmental problems.

Research conclusions: Take the north side shaft construction of Wuhan Yangzte River tunnel for example, this paper analyzes the construction effect in terms of excavation steps, pipe material, buried depth, distance to pit, pipe diameter and wall thickness of pipe. The result indicates that the pipeline displacement increases as excavation depth. The magnitude of the displacement is mainly determined by the first two excavation stages. The first two excavation stages should be strictly monitored; for the sake of diaphragm wall, end-effect exists on the pipeline. End-effect becomes distinct as close to the pit. And the displacement mode is changed for the sake of end-effect; outer diameter and thickness of pipeline has no distinct effect on pipeline displacement; multiple types of pipelines have no distinct effect on each other when they exist together.

Research results:Through calculating and optimizing the excavation subsequence with multiple-goal planning theory, and taking many rational technical measures , the subsidence of the existing Line 1 under-passed by Line 10 in Guoshuang Section is effectively controlled and the max. subsidence value is 4. 83 mm, which is less than the limitation value of 5 mm and guarantees the construction safety and normal operation of existing Line 1.

Research conclusions:Main defects of the secondary，holes lying behind the crown, and the next is seepage. The secondary lining mechanic is showed to be very complex and unfavorable due to holes. The weak parts locate the crown and middle of the arch. The first reason of lining defect is that construction had not adopted IVATM and had not caught the key design meaning. The next reason is that it is hard to fill the crown fully and densely. Some treatments are presented if the hole size lying behind the crown is very large to ensure the operation in safety.

Research results: Through analysis of the characteristics of linear motor vehicles and the line , we integrate the single construction that displaying the characteristics of LIM fully. With proved, compared to choose, learned from the advanced maintenance concept design in foreign, we put forward a reasonable overall layout and save the land. By use of the new technology and the new idea boldly, we develop the practical and feasible maintenance pattern which laid the foundation for widespread using the automatic LIM vehicles in Beijing, to gain the experience and to save the project investment.

Research conclusions:Generally, there are three types of evacuation in the tunnel, which are the corridor neighbour tunnel evacuation, the special horizontally tunnel evacuation and the inner vertically evacuation. Through the comparison among these evacuation methods, it is concluded that the evacuation type and the distance between two transverse tunnels should be determined by the geological and constructional condition.

Research results: Through doing researches, the design scheme of matching ratio of high performance concrete is selected to meet the durable requirement, the matching technology of concrete construction machinery and construction procedure，mastered, and the summary is made on high performance concrete construction technology for large sectional loess tunnel on passenger dedicated line to achieve the rapid, high quality and high efficient construction.

Research conclusions:The results of the experiment are as follows; the bending strength of the concrete with 8% of the slag cement substituted by silica fume is 8. 8 MPa at the three-day age, increased by 44.3 %，while it is 11. 4 MPa at the twenty eight-day age, increased by 50.0%;some properties of the sample ZR-2，adulterated with silica fume , ，dramatically prior to the sample ZR-1，such as the corrosion-resistant properties of brine salt solution , anti- freeze-thaw performance and anti-permeability performance. According to the data of this experiment, we could assert that with 8% of slag cement substituted by isometric silica fume, the high-bending concrete with good durability could be achived.

Research results:Through summary on the theoretical base of vertical integration, the analyses of five characteristics of general construction contractor project are made, the discussions are made on the factors influencing the vertical integration of general contractor from six aspects of business cost, production efficiency and management cost, optimum design, investment amount, assets specialization and market competition, and the conclusion is made that the construction enterprise with single ability can carry out the vertical integration toward general construction contractor.

Research conclusions:The economic benefit of protection engineering for geological disasters along railway is made up of loss-reduced benefit and value-added benefit,which has its own characteristics by compared to general engineering. The loss-reduced benefit is the focus of analysis. By establishing loss accounting model, cost accounting model and economic benefit accounting model, and by the step-by-step analysis of the accounting, the standard of geological disaster management measures and investment programme can be determined.

Research Conclusions: BT project mode is suitable for the developed area with large amount controlled financial revenue. The successful BT project requires a credible and high-efficient government. BT project is action between government and enterprise with signing contract by the authority of government and enterprise rather than company and the enterprise. A perfect BT protect should have good social benefits and evaluation of the government, which can influence the thoughts on the reform of construction management mode in the area, so the more attention should be paid to the BT project mode so as to enlarge the business scope and market portion and realize the scale benefits of the contractor.

Research conclusions: EU's common transport policy is intended to get rid of various restrictions and coordinate the transports among the member states. To invigorate railway transport is an essential step for realizing a balanced development of different transport modes. EU's policy on railway transport has been laid down in laws, and all the member states，requested to change their policies into laws. For years, EU has made efforts on establishing a unified European railway system for the purpose of establishing a unified European railway market, thus enhancing the unified use of its railways and further opening the railway transport market. EU's railways are financed mainly by public budget , private investment, highway toll income and turning the external costs into internal expenses, so as to maximize the benefits of transport.