22TCN 244-98 PDF

x. Report 22 TCN (Xu ly dat yeu bang bac tham).pdf Documents · 22 TCN 22 TCN Cat gia co xi mang – TCN Pham vi. 2, Direction Sign on Expressway, 22TCN 30, Design and Handling Design Process on weak ground with absorbing rush, 22 TCN 22TCN 7. Standard for soft soil treatment design with PVD. 22TCN – 8. Geo-textiles in construction of embankment on soft soil.

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Settlement depth of soft soil under affection of embankment loading capacity or scope of affection by embankment loading capacity za shall be determined in accordance with the conditions as follow: Test to determine confined compression of undisturbed soil samples in the depth z is carried out in accordance with the Standard TCVN If the most dangerous sliding surface is not calculated by computer model.

For load in the left: Calculated loads in checking stability and forecasting settlement of embankment on soft soil include loads of embanking and pre-loading.

For construction works in soft soil. Page 17 of Notice for settlement estimation Page 32 of On sandy mud or fine sandy mud area normally.

L — Length of PBDs m. Page 21 22tnc U is calculated by decimal number of … e. In trial construction VI. Requirements and specifications for settlement calculation II. Expressway and highway class 80 2.

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For a circular sliding surface with center Oi. Those properties shall be separately determined for different soft soil layers. In case of considerable distribution of soft soil area such as lagoon area ….

Settlement instruments are placed at beginning elevation point of the embankment: In two ways of determination of pre-consolidation pressure value.

Loading diagram and example of using Osterberg Abac in case of rectangular load.

22 TCN 246-98 x

Method of stability calculation is defined in V. It means that excavation depth of soft soil can only fit sub-grade width. U — Forecasted consolidation level can be gained from the beginning of first embankment until that of the second one: Self-weight of each sliding piece Qi is determined as follows: Requirements on embankment stability Page 2 of 40 22 TCN – Embankment on soft soil should be stable, undamaged due to changes in the construction of embankment embankment is carried out in accordance with design or carried out with elevation over the one in design for pre-loading and in operation afterwards.

General Requirements for embankment structure on soft ground IV.

[PDF] 22TCN _En, 22 TCN –

To check elevation at the time of arranging settlement instruments and to measure settlement once a day in embanking and pre-loading. Estimation of consolidated settlement by time in case of two-way drainage system with application of sand drain or PBD VI. Bamboo stakes shall be driven. Observation time for the trial work should be from months. PBD used for vertical consolidated drainage must satisfy the following requirements: The rods are made by steel. From the testing result to determine of pre-consolidation pressure at different soil layer i.

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If the calculation results realize that requirements and specifications defined in II and IV.

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If using mathematical models available on computer. Longitudinal distribution scope of vehicle loads. Page 18 of D30 — grain size. Direct embanking shall be applied for the cases as follows: Vertical consolidated drainage method 22tcb normally adopted when soft soil layer is thick its thickness is excessive to width of embankment bottom and embankment ground is high.

The system shall be arranged in accordance with the following regulations: Diagram to determine dangerous sliding center I is slope centerline.

In this specification, the soft ground determined in Section I.

Samples shall be taken. Selection of geo-textile and structure of temporary roads for traffic on soft soil area Table IV.