Abstract
The rising of groundwater level induced by intense rainfall has significant influence on the slope stability. A new drainage method for landslide mitigation, namely the air-injection method, is proposed in this paper to control the quick rising of the groundwater under heavy rainfall to reduce the risk of landslides in a situation of emergency. A large-scale slope model is established in the laboratory to study the influence of the air-injection method on the groundwater level variations. The test results indicate that air injection divides the slope into three zones and forms a low permeability unsaturated zone to prevent the upstream groundwater flowing to the downstream slope. Two phases are identified during the air injection, (a) a formation phase of the unsaturated zone and (b) a steady-state phase of the unsaturated zone, and the unsaturated zone continues to intercept the upstream groundwater flow within a certain period of time after air injection is ceased. Furthermore, increasing the injection pressure appropriately can enhance the effectiveness of the air-injection method in intercepting groundwater.
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