【正文】 ound nuclear waste, it is necessary to solve the deep excavation of the postrock pressure and rock strata in the role of nuclear waste under the stress of high temperature change。 (7) Construction of the summer heat must be cooled to control the concrete into the mold temperature shall not exceed 28 ℃ 。 (3) do a good job back to the outskirts of underground construction fill, is the underground construction of the first line of defense against water。 11 (3) The regulations: First, the summer heat without cooling measures construction: concrete mixture into the mold temperature is higher than 35 ℃ , when the temperature dropped at night when the temperature both inside and outside the large and prone to fracture。 3) against the practice of underground structure calculation and analysis of the simulation. No matter how kind of an underground structure, the system solve the overall analysis, ponent analysis and dug up the ground floor of the structure of the three aspects of the problem of the real simulation of underground structures of the structural optimization of a certain significance. Calculation methods and design e to the Conclusion, it can be used as the structural design of underground structures of reference. Most of the use of underground reinforced concrete structures or steel reinforced 10 concrete structure, the current design specifications related to the probability theory are based on limit state design method, the reliability of indicators to measure the reliability of structural ponents using the design of subexpressions coefficient design. Limit state can be divided into the carrying capacity limit state and serviceability limit state, for the carrying capacity limit state should be met: Cracks in the ground floor of building structures to deal with prevention and treatment. Analysis: (1) Design factors: emphasis on the general design of underground construction works vertical wall panels of the reinforced structure and intensity, the level of neglect of horizontal reinforcement cracking strength. Crosssection of the wall structure due to the particle stress is nonuniform shrinkage stress and thermal stress of concrete efforts to achieve the ultimate tensile strength, caused by the plastic deformation and fracture。 sound insulation and sound absorption of the appropriate use of measures to control the noise level allowed. Building to deal with such as a plete portfolio of interior space and changes in the unity of the material texture and contrast the rich interior colors and harmonization, have helped to create a good internal environment, the elimination of the underground environment on people39。s cold climate, so in large cities, the development of underground mercial center of the city of Montreal has a few underground mercial center even as a construction area of 810,000 square meters, forming an underground city. In addition, industrialized countries also paid attention to the protection of underground construction to play the traditional style of the city to improve the urban environment, urban space, etc. to expand the positive role played by. For example, the city of Nagoya, Japan in conjunction with urban roads alteration, in the ground layout of the mercial street and parking lot, stay out of the ground in addition to the necessary pedestrians, carriageway, in the central part of the park into a largescale city center. Other factors, such as Tokyo, Osaka and other places are also provided with the underground business street. Another example is the University of the United States a number of historical buildings and structures in order to preserve the unity of style and ease tension in the land, the construction of a number of underground construction, such as library, gymnasium, teaching Museum (Figure 2), achieving good results. These facts reflect the tiefbau increasingly wide range of applications. Underground construction of the type of underground construction can be classified according to the functions of military, civil, air works, industry, transport and munications, storage and other buildings, and underground utilities. For example: in the construction of military fortifications can be used for shooting, observation of construction, shelter construction, etc.), in civil construction, including residential buildings, public buildings, a variety of civil air defense engineering, industrial construction, transportation and munication construction, warehouse construction, as well as the types of underground utilities, such as underground water plant, solid or liquid waste 5 treatment plant, pipeline and other corridors. Several features of both largescale underground construction known as the underground plex. Tiefbau classified according to construction method, there are two types of open excavation and mining. Open excavation pletely backfilled after construction, the above did not build any buildings, known as singlebuilt underground construction。s first underground railway. During World War II, the protection of underground construction in the superiority of attention, some veterans of the important military installations and arms factories, warehouses, etc., built in the ground, and the construction of the airraid shelter for the residents. Since the late 50s, as a result of economic development and scientific and technological progress, the rapid increase in 3 urban population, the increasingly serious environmental pollution, energy crisis and the existence of the danger of war and other factors, underground construction in Japan, the United States, Sweden, the Fe