Study Area

ABSTRACT: Horizontal drains have been used extensively for preventive and repair works of slopes. Horizontal drains have been found to be effective in lowering groundwater table to increase the stability of slopes. The ideal location of horizontal drain is at the toe of the slope in order to optimize the thickness of unsaturated zone from the horizontal drain to the ground surface. However, the ideal length of the horizontal drain has not been fully investigated, particularly for residual soil slopes. In this study, the effectiveness of different lengths of horizontal drains in sedimentary and granitic residual soils is investigated. Typical soil-water characteristic curves and permeability functions of the soils were used in performing seepage analyses of water flow through unsaturated soil slope with horizontal drains.

ABSTRACT……………………………………………………………………….21 INTRODUCTION……………………………………………………………….2
2 FIELD MONITORING…………………………………………………………3
2.1 Study Area………………………………………………………………………….3
2.2 Field Instrumentation and Data Collection……………………………………5
3 DESIGNING OF PARAMETRIC STUDY……………………………………..5
3.1 Modelling of Residual Soil Slopes………………………………………………6
4 RESULTS AND DISCUSSION……………………………………………………….12
5 CONCLUSIONS……………………………………………………...………...16
Glossary……………………….…………………………………………………17