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Assessment of the effectiveness of corrective measures in relation to geological conditions and types of slope movement

  • Hutchinson N. N. 
Theme 3 Assessment of the Effectiveness of Corrective Measures in Relation to Geological Conditions and Types of Slope Movements General Report

Summary

The General Report consists of three parts. In Part 1, the various types of corrective measures are briefly reviewed. Attention is then concentrated on the two, most used measures; modification of the slope profile by excavation and filling, and drainage. An analysis is made of the optimum positioning of corrective cuts or fills, making use of the influence line concept, borrowed from structural engineering. In this way a neutral point, neutral line and neutral zone are defined for circular and non-circular landslides and for various values of B with respect to the applied change in total stress. Drainage is then discussed in more detail, with particular atteniion being given to horizontal drains and to trench (and counterfort) drains. Performance data for trench drains in the U.K. are then reviewed and analysed. From this a tentative basis for design is developed.

In Part 2 the papers contributed to Theme 3 of the Symposium are reviewed. The clogging of drainage systems by siltation or by geochemical effects, is also discussed. Finally, in Part 3, some suggestions are made as to the desirable directions of future research. An extensive list of references is provided.

Keywords

Trench Slip Surface Neutral Line Neutral Point Piezometric Level 

Evaluation de l’efficacite des mesures de stabilisation par rapport aux conditions géologiques et aux types des mouvements du terrain

Résumé

Le Rapport Général se compose de trois parties. Dans la première partie les différentes mesures de stabilisation sont brièvement examinées. L’attention est ensuite portée sur les deux mesures les plus courantes: la modification du profil de la pente par excavation et remblayage et par drainage. Une analyse est faite de l’emplacement optimal des tranchées ou des remblais de stabilisation qui utilise le concept de la ligne d’influence emprunté au génie structural. De cette manière un point neutre, une ligne neutre et une zone neutre sont définis pour les glissements de terrain circulaires et non-circulaires ainsi que pour des valeurs diverses de\(\bar B\) en tenant compte du changement apporté à la tension totale. Le drainage est ensuite discuté de façon plus approfondie en insistant plus spécialement sur les drains horizontaux et les drains tranchés (et contreforts) en particulier. Les résltats d’essais sur l’utilisation de drains tranchés dans le Royaume Uni sont présentées et analysées. A partir de ces données une tentative de mise au point de drains tranchés est developpée.

Dans la deuxième partie les contributions écrites du Sujet 3 sont discutées, ainsi que le colmatage des systèmes de drainage par dépôt de limon et par effets géochimiques. Enfin, dans la troisième partie sont présentées des suggestions sur l’orientation à donner aux futurs projets de recherches. Une liste détaillée de références est donnée.

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Copyright information

© International Association of Engineering Geology 1977

Authors and Affiliations

  • Hutchinson N. N. 
    • 1
  1. 1.Department of Civil EngineeringImperial College of Science and TechnologyLondonUK

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