impact value
3.By reviewing the cases of environment impact value of urban rail transit in China in recent years, and based on the analysis and summary of environment impact value (EIV) results and practical effects, some problems in environment impact value (EIV) are discussed comprehensively, among which arc the choice of environment protection targets, the accuracy of source strength analogy, forecasting methods of noise and vibration and the principles of control measure.
5.The C v method of DWTT, parameter method of M= C v 1/2 / YS and Leis amendment method can rectify this bias in some degree to less tolerance between prediction and measurement through the analysis of several fracture control parameter such as sharply impact value,COD, DWTT test and measurement of anti crack toughness. This makes the prediction value approach to actual measured value, and improves the accuracy of pipeline anti crack prediction sharply.
8.The inter-pervasion and inter-impact of those value orientations have many types.
9.The components and inter-impact of those value orientations have various impacts on the implementation process of public policy.

