Excavated soil from a trench is to be placed in a triangular spoil bank. If the dimensions of the excavated site are 600 ft long by 4 ft wide with an average depth of 6 ft, what size spoil bank, in terms of base width and pile height, will be created. Assume the excavated soil is a clay

Excavated soil from a trench is to be placed in a triangular spoil bank. If the dimensions of the excavated site are 600 ft long by 4 ft wide with an average depth of 6 ft, what size spoil bank, in terms of base width and pile height, will be created. Assume the excavated soil is a clay

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter15: Retaining Walls, Braced Cuts, And Sheet Pile Walls

Section: Chapter Questions

Problem 15.22P

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Concept explainers

Braced cuts

The braced cut is a method of providing lateral support to the soil in foundation trenches, to prevent the trenches from deformation by the caving in of soil and resisting it from moving laterally. During shallow excavation in firm soil, generally, slopes are provided to resist the caving in of soil. During shallow excavation in soft soil and deep excavation, the chances of caving in of soil increase. Hence, it becomes necessary to make a provision to resist the deformation of trenches due to caving in of soil. The braced cut is the method used for such conditions. The excavation using braced cuts is a bit uneconomical as compared to the traditional open-cut excavation method but provides better safety than the cut excavation method.

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A ditch having a cross-sectional area of 3.0 m² is being excavated, the material is clay. Find the height of the triangular spoil bank that would result from this excavation.
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Table 2-5 Typical soil weight and volume change characteristics* Unit Weight [Ib/cu yd (kg/m³)] Swell Shrinkage (%) Load Shrinkage Loose Bank Compacted (%) Factor Factor Clay Common earth Rock (blasted) Sand and 2310 (1370) 2480 (1471) 3060 (1815) 3000 (1780) 3100 (1839) 4600 (2729) 3750 (2225) 3450 (2047) 3550 (2106) 30 20 0.77 0.80 0.90 1.30** 25 10 0.80 50 -30** 0.67 gravel 2860 (1697) 3200 (1899) 3650 (2166) 12 12 0.89 0.88 *Exact values vary with grain size distribution, moisture, compaction, and other factors. Tests are required to determine exact values for a specific soil. **Compacted rock is less dense than is in-place rock. 2-5 SPOIL BANKS When planning and estimating earthwork, it is frequently necessary to determine the size of the pile of material that will be created by the material removed from the excavation. If the pile of material is long in relation to its width, it is referred to as a spoil bank. Spoil banks are characterized by a triangular cross section. If the…
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