No abstract

With the increasing public attention to environmental protection, the control of pollution has become a joint goal of human. As one of the four major environmental pollutions, noise pollution seriously affects the normal study, work and health of teachers and students in schools, hence becoming an environmental issue of general concern in modern society. At present, the research and prevention of noise in colleges and universities are still in the initial stage in China. In addition, there are few noise studies in universities based on regions. Most of people are lack of enough attention to noise pollution, prevention and control measures and there is much room for improvement in all aspects. The purpose of this review is to summarize the current situation and causes of campus noise pollution in the central region of China and put forward some suggestions to improve the quality of sound environment on campus. In the end, it will provide some feasible references for the research in related fields.

Taking the draw water tunnel of the Jiulong river across railway in Fujian province as the research object,the influence of the subgrade settlement of Yingtan-Xiamen double railway and Xiamen-Shenzhen high-speed railway as a result of the double draw water tunnel excavation is analyzed by FLAC3D. Through numerical simulation the condition of whether the subgrade is reinforcement and whether have train load on the subgrade, the result of subgrade settlement in both single tunnel perforation and double tunnel perforation is derived. It shows that: the position of maximum settlement is just above the tunnel centerline, the proportion of subgrade settlement caused by the right line excavation is 67.5% and the one caused by the left line excavation is 32.5% when subgrade is unreinforced and there is no train load; the proportion of subgrade settlement caused by the right line excavation is 60% and the one caused by the left line excavation is 40% when subgrade is reinforced but there is no train load. The proportion of subgrade settlement caused by the right line excavation is 63% and the one caused by the left line excavation is 37% when subgrade is reinforced and there is train load. The results fit well with monitoring data and can be used as a reference for similar engineering projects. Currently, with the rapid development of China's economic, the situation of other engineering projects crossing the existing railway line has been increasing. Most researchers is carried out through the way of on-site monitoring to analyze deformation of ground surface and the railway embankment, and then comes up with the safety assessment and displacement control measures of the tunnel construction[. The common methods of ground surface deformation analysis and prediction contain empirical formula, model test and numerical simulation[. There are a lot of numerical simulation achievements for new construction crossing the existing railway[3-, which mainly focused on the embankment settlement for single or multiple tunnel beneath a single railway line. Based on previous studies, this paper analyzes the railway embankment settlement under the condition whether there is reinforced roadbed or not, and whether the two-lane tunnel crosses many railway line with a combination of train load conditions through the method of three-dimensional model, and compares with the measured data to verify the reliability of numerical simulation. 1 Engineering project and its engineering geological conditions

With the acceleration of urbanization, Combined Sewer Overflows(CSOS) has become one of the important sources of polluted urban water. This paper overviewed the domestic and foreign CSOs current situation, and analysed the problems and deficiencies in the regulatory of CSOs in China. According to the characteristics of CSOs, we suggested that the regulatory of CSOs focus on the source, pipes and ends of the drainage system. The conclusion would be evidence for improving the combined sewerage system in China.

The current problems of drainage system have been analyzed by addressing the current situation of combined sewerage system in Chongqing area. According to the geographical characteristics of the terrain and the existing pipeline system, advices on modification works have been proposed which would meet the demand of sustainable development of Chongqing drainage system.