Soil nail design for existing soil cut slopes in Hong Kong

Pao Yue-kong Library Electronic Theses Database

Soil nail design for existing soil cut slopes in Hong Kong

 

Author: Lo, Shu-wing
Title: Soil nail design for existing soil cut slopes in Hong Kong
Degree: M.Sc.
Year: 2001
Subject: Slopes (Physical geography) -- China -- Hong Kong
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Civil and Structural Engineering
Pages: vii, 115 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1569122
URI: http://theses.lib.polyu.edu.hk/handle/200/3264
Abstract: Soil nailing is. commonly used to upgrade existing soil cut slopes in Hong Kong under the contracts of the Landslip Preventive Measures (LPM) programme. In 1996, Geotechnical Engineering Office (GEO) published a GEO Report No. 56 -Application of Prescriptive Measures to Soil Cut Slopes. Prescriptive soil nail design in accordance with the recommendations of the GEO Report No. 56 was then widely applied to existing soil cut slopes. The use of the prescriptive soil nail design is simple and saves time and human resources. However, since the prescriptive soil nail design approach is on experience-based, its application is limited by the qualifying criteria given in Table 1 of the GEO Report No. 56. The limitations of the application include slope height, slope geology and groundwater conditions. In December 1999, the second edition of the GEO Report No. 56 was published. The scope of the application of the prescriptive soil nail design is extended to higher slopes and more site geology, yet it is still not enough to cover existing soil cut slopes which have greater slope height or higher groundwater tables. In this dissertation, the study has focused on soil nail design for existing soil cut slopes of higher slope heights and groundwater tables than those in the qualifying criteria given in Table 1 of the GEO Report No. 56. The effects of different combinations of soil height, slope angles, soil parameters, and groundwater tables on the slope stability have also been studied. Conventional analytic approach with using of computer program "SLOPE/W" has been adopted For the soil nail design in this study. Results of the design calculations have been summarised in form of tables and graphs, which can be applied to soil nail design for existing soil cut slopes in Hong Kong. Moreover, comparison between soil nail design by the conventional approach and the prescriptive approach is made and discussed in this dissertation.

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