The construction industry has experienced a great deal of development over the years by both developed and developing countries. Tunnel construction is one of such aspects which have over the year developed in its methods of construction. Research, however has shown that methods of tunnel construction are becoming more complex and the risk associated to it is increasing, therefore, the need for the application of risk assessment to prevent accidents in tunnel construction exists. This paper aims at highlighting some of the risk in tunnel construction and the theoretical and practical method of risk assessment that can be used to minimize these tunnel risks.

Mainly based on Singapore’s workplace safety and health (construction) regulations 2007 and China’s safety management measures for section(subsection) works with major hazards 2009, the paper introduces and analyzes the Singapore’s safety management system for high-risk construction works, and simply compares it with the management mechanism of China’s section(subsection) works with major hazards, the following conclusions are drawn: (1) The application scopes of Singapore’s high-risk construction work permit-to-work system and China’s the management mechanism of section(subsection) works with major hazards are different, and generally speaking, the former includes more construction works than the latter. (2) The mechanisms of Singapore’s high-risk construction work permit-to-work and China’s management of section/ subsection works with major hazards are different. (3) In Singapore no independent construction safety supervision system exists, while in China it is usually required by the laws. (4) In Singapore any person who contravenes any provision of workplace safety and health (construction) regulations 2007 which imposes a duty on him shall be guilty of an offence and may be liable on conviction to imprisonment for a term not exceeding 2 years; in China any person who contravenes any provision of safety production law, building law and corresponding safety regulations but doesn’t lead to serious consequences shall not be liable on conviction to imprisonment. (5) In Singapore the safety assessor evaluating and endorsing the application for a permit-to-work must assume his lawful duty for his undue conducts and decisions, in China the safety experts responsible for checking the special safety construction scheme needn’t assume any lawful duty.

With the aggravation of power demands, applications of power cables are more extensive. Researchers also start studying power cable fault location to find out a fault point rapidly and accurately, reduce losses effectively, and provide sufficient and continuous power supply. In the paper, by introducing relevant principles of Wavelet Transform, the simulation experiment is conducted. Wavelet decomposition and reconstitution are applied to realize signal filtering. A multi-scale edge detection theory is utilized to realize calculation of cable fault location. The experiment finds that Wavelet Transform is used to calculate power cable fault location with high accurate results. The error is smaller than one sampling distance. Such a method has a larger applied value.