Sea sand-cement-fly ash column technology for soft soil treatment is a new technology in the process of completing the theoretical basis, the experimental basis, and the construction of the ground treatment technological procedure. The paper presents the results of scientific research on design, calculation, construction, and acceptance of sea sand-cement-fly ash column. The scientific basis for the design of column is to consider the role of the column in composite ground, that is to use the column as soft ground improvement or soft soil reinforcement. The important parameters for the column design are: cement and fly ash content; column length; column diameter; number of columns; distance among columns; load capacity and settlement of composite ground. The sequence of steps of construction and acceptance of column includes: selection of construction equipment, preparation of construction sites, trial construction, official construction, evaluation of ground quality after treatment and preparation of document for acceptance.
The different reasons causing the instability of slope, one of the causes affecting the stability of slope of the dyke body is the impact of the water level in front of them and the unstable seepage. Especially in the current climate change, the change of water level on the flow system (rivers, streams, …) and sea is greatly affected, which is reason causing the instability of slope of the dyke body. Therefore, this paper will analyze the impact of the tide on the dyke stability, which contributes to supplementing and completing the design and audit method of the dyke slope stability. The resutls are applied analysis and calculation on some typical sea dyke in Quang Ninh province.
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