General Specification for Civil Engineering Works (GS)

The General Specification for Civil Engineering Works lays down the quality of materials, the standards of workmanship, the testing methods and the acceptance criteria for civil engineering works undertaken for the Government of the Hong Kong Special Administrative Region. Where necessary, this General Specification should be supplemented by a particular specification. The 2006 Edition of the General Specification comprises considerable greening of the Eighth Reprint of the 1992 Edition (October 2002) according to the current green practices of the construction industry. The text relating to "green measures" is printed in green colour in this Edition with a view to making it easier for reader's reference. It was produced over a 15-month period from March 2005 under the guidance of a Steering Committee comprising members from the main Government departments involved in civil engineering works. The greening of each section was undertaken by a works department with the appropriate expertise. The Standards Unit of Civil Engineering and Development Department (CEDD) was responsible for the overall co-ordination of comments received from departmental circulation, editing and production of the document. Amd 1/2007 Sustainability is the prime objective of the 2006 Edition. Two new sections, viz. Environmental Protection (Section 25) and Preservation and Protection of Trees (Section 26) have been created. The original Section 22 for Railways Works has been deleted, as construction of railways is no more the responsibility of works departments. The 2006 Edition comprises 26 sections and is posted on the CEDD Homepage on the Internet. The General Specification will be updated continuously. The electronic files of the sections affected by any amendment issued will be kept up-to-date on the CEDD Homepage.

Emergency Planning for Industrial Hazards

Guide to reinforced fill structure and slope design

This Geoguide recommends a standard of good practice for the design and construction supervision of permanent reinforced fill structures and slopes in Hong Kong. It is a companion to Geoguide 1 − Guide to Retaining Wall Design (GEO, 1993) and is aimed at qualified engineers who are conversant with the relevant engineering principles and procedures. Reinforced fill is a compacted mass of fill with predominantly horizontal layered reinforcing elements to improve its tensile and shear capacities. Permanent reinforced fill features are made of reinforced fill, which may also comprise facing elements to form slopes or structures with an intended design life longer than two years. A reinforced fill feature with a face inclination of more than 20º from the vertical shall be considered as a reinforced fill slope. A reinforced fill feature otherwise shall be considered as a reinforced fill structure. The geotechnical standards set out in this Geoguide is for new permanent reinforced fill features, including retaining walls, bridge abutments, segmental block retaining walls and reinforced fill slopes. Temporary reinforced fill structures and slopes can also be designed using the document. The Geoguide does not cover soil nailing, reinforced fill dams, maritime structures, structures which are in an estuarine or marine environment, reinforced fill foundations for embankments on soft ground and the stability assessment of existing reinforced fill structures and slopes. General considerations relating to potential applications, advantages and limitations of different reinforced fill systems are provided in Chapter 2. The concept and principles of reinforced fill, together with the factors that affect the behaviour of reinforced fill are explained in Chapter 3. In addition, general design formulae for assessing interaction between fill and reinforcement (i.e. pullout and direct sliding resistance) are provided for various forms of reinforcement (i.e. strips, grids sheets, anchors) in Chapter 3. Details of the construction materials commonly used to form reinforced fill structures and slopes are given in Chapter 4. Chapter 5 covers the specific ground investigation and testing associated with the design and construction of reinforced fill features. In line with Geoguide 1, the limit state approach has been adopted in this Geoguide. The appropriate partial safety factors on loading, materials and fill-reinforcement interaction, together with the factors which need to be considered in design are given in Chapter 6. Guidance on the design of reinforced fill structures including segmental block retaining walls is given in Chapter 7. Chapter 8 covers the design of reinforced fill slopes. Guidance on aesthetics and landscape treatment of reinforced fill structures and slopes is covered in Chapter 9. The procurement of and specification for reinforced fill construction relating to common construction practices are addressed in Chapter 10. Guidance on construction control is given in Chapter 11. There are a few terms used with specific meanings in this Guide. These meanings are given in the Glossary of Terms at the end of the document.

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