Advanced Materials Research Vols. 971-973

Abstract: According to recent development of environmental geotechnical engineering, Some characteristics and related disciplines of geotechnical engineering are summarized and elaborated. Environmental geotechnology views and appropriate countermeasures are proposed, and urban construction of environmental geotechnical problems are briefly analysed. By emphasizing potential environmental geotechnology , further development and improvement for theories and pratices can be obtained.

Abstract: The text gives a detailed description of control strategy over power synthesis device with hydraulic energy-saving technology, allocates power for combination drive system during different work procedures reasonably and provides theoretical basis for research of power synthesis technology in the future.

Abstract: Railway Land design has an important influence on project investment, land resources utilization and environmental protection. Based on the ObjectARX custom entity technology of AutoCAD , this study proposes a new method of land design. To fulfill this purpose, at first, this paper customizes custom entities of railway land areas and geographic areas, which involves existing buildings, cash crop areas and environmental preserves. It is convenient to design the land by editing these entity data or directly dragging land piles in AutoCAD . Besides, computer will automatically calculate the land quantity and cost in real time, which can help designers analyze the land use. Practices have proved that this method can avoid a large number of tedious statistical work and significantly improve the efficiency of land use design.

Abstract: Remote sensing (RS) and geographic information system (GIS) are an important means of monitoring water body areas for large lakes and water reservoirs. This study is based on environment and mitigation satellite CCD data characteristics of China's own R & D, using the combining method of multi-band and single-band to construct a water body identification patterns based on environmental mitigation satellite and extracting the water body area of Qinghai Lake since the September of 2008 to 2011 during April - November each year. Then the variations characters of the annual, seasonal and monthly were analyzed during 2008 and 2011. At last, induced its driving force of area variation of Qinghai Lake.

Abstract: We did sorts of shear strength tests in different moisture content conditions with amount of disturbed soil which was collected from the swelling soft rock in the north of xianfeng town open-cast coal. Furthermore, we analyzed the physical relationships between moisture content of the rock-soil mass and shear strength under different soaking time or different moisture content conditions. Finally, we find the shear strength of rock-soil mass drops along with the saturated degree of test specimen doubled and re-doubled. We get a conclusion that soaking of the rock-soil mass has a strong influence on the strength of rock-soil mass. The soaking of groundwater and surface water could soft the rock-soil mass, which plays an important role in controlling the stability of side slope, also in continuing slip deformation.

Abstract: TheCoulomb stress changes are usually adopted to make analysis on faultinteractions and stress triggering. This paper mainly deals with Coulomb stresschange of mainshock and affect on aftershocks. We preliminarily conclude thatthe mainshock produce Coulomb stress change on aftershocks most behavingpositive and triggered them. By calculating it is obvious that more aftershocksfell into stress increasing area and triggering percentage is up to ninety ofmaximum and seventy-one of minimum.

Abstract: With the development of thetimes, the floor space has been unable to meet human requirements, bututilization of urban underground space has become a kind of choice to solvevarious problems. In recent years, many international organizations andresearch institutions have begun to develop urban underground space, and otherissues have been discussed in a number of meetings. As a new type of transportation, subwaycan effectively solve traffic congestions. This paper applies a kind of computer-aided Engineering,like ANSYS, to establish three-dimensional finite element model offour-hole parallel tunnel, Loadingthe subway train, andthen calculating, finally analyzing rules of vibrationof the surrounding ground of four-hole parallel tunnel when the subway is working.

Abstract: Based on the Grey neural network, combine with the sampling data from Yangtze estuary wetland which measured in fifteen sampling site in raising tide and falling tide in May 2010 to intelligent comprehensive evaluation the sea water quality of Yangtze estuary wetland. The results showed that the sea water quality of sampling data wereⅠ.The precision of training and testing data set showed the Grey neural network had good generalization capacity, with good fitting precision and strongly predictive ability. It can be used to similar data set calculation.

Abstract: Because of the high cost, complex structure, workedlong period of time in abominable condition and especially in north pole withthe extremely condition, the reliability of the buoys should be very reliable. Thereforeto research the useful lifeand the security on active service of the buoys have very important meaning.

Abstract: This paper introduces a new method to get the saturated-surface-dry mass of coarse aggregate based on basket method, by testing the difference of the aggregate mass before and after being immersed in water for 24 hours. It also describes the design of test process. By comparing the different test results of the new method and the method in current code, it shows significant advantages of the new method and removes the shortcoming of the current method, the result is more close to the real value of material properties.