Assessing slope protection methods for weak rock slopes in Southwestern Taiwan

被引:42
作者
Lee, Der-Her
Yang, Yi-En [1 ]
Lin, Hung-Ming
机构
[1] Nan Jeon Inst Technol, Dept Contruct Engn, Tainan, Taiwan
[2] Natl Cheng Kung Univ, Dept Civil Engn, Tainan 70101, Taiwan
[3] Natl Cheng Kung Univ, Sustainable Environm Res Ctr, Tainan 70101, Taiwan
[4] Leader Univ, Dept Construct Technol, Tainan, Taiwan
关键词
weak rock; mudstone; slope failure; slope characteristics; slope protection methods;
D O I
10.1016/j.enggeo.2006.12.005
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Failures of weak-rock slopes adjacent to roadsides in southwestern Taiwan most often occurred during or immediately after heavy rainfall. Field survey of weak rock slopes along the national South-2 Freeway conducted in this study showed that the slope protection methods employed in the study areas mainly included vegetation (82.0%), prestressed rock anchors with vegetation (6.8%), grille beam (5.9%), rock anchors with grille beam (3.6%). The highest failure rate occurred in the slopes that were protected by the vegetation method. The most frequently encountered weak rock formation along the South-2 Freeway is the alternating sandstone-shale formation (36.3%), followed in sequence by sandstone (24.4%), conglomerates (21.9%) and mudstone (17.4%). The field survey also found that the mudstone slopes present the highest failure rate among all rock types, and the most commonly encountered modes of failure were surface erosion and shallow slides. Factors affecting slope failure include inadequate drainage of storm water runoff, disparate rock types and vegetation on slope surfaces, slope angles and heights. This paper presents results of the field survey of the rate of failures of weak rock slopes in Southwestern Taiwan and examines the attributes of slope failures and the effectiveness of commonly used slope protection methods in the region. Requirements or essential features of an effective slope protection method are then presented along with the preliminary results of its field implementation. (c) 2007 Elsevier B.V. All rights reserved.
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页码:100 / 116
页数:17
相关论文
共 22 条
[21]  
TSAI CL, 1984, NSC730414P006011
[22]   An experience of tunnelling in mudstone area in southwestern Taiwan [J].
Wang, TT ;
Huang, TH .
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY, 2002, 17 (04) :425-436