January 2021

A hollow bar soil nail wall is used as a temporary soil retention struc- ture. The retained soil and its properties are shown in Figure 7.61. The following design parameters are also selected for this project: Pullout factor of safety, FSp = 2.0 Global factor of safety, FSG = 1.4 Nail horizontal spacing, SH = […]

A cantilever sheet pile wall is driven into undrained clay and then back- filled with granular soil. The groundwater table is at the dredge line. The sheet pile and the soil characteristics are shown in Figure 7.57. Determine: (1) The depth of the embedment, D, using a factor of safety of 1.5 for strength reduction.

A homogeneous silty sand embankment is built on soft clay. The soil profile is shown in Figure 5.42. A potential critical slip surface is also shown. (1) Use the ordinary method of slices to determine the FS on the assumed failure plane. (2) Use Bishop’s simplified method of slices to determine the FS on the

A natural slope is shown in Figure 5.41. It contains two soil strata. The slope configuration and the soil characteristics are shown in the figure. A potential toe circle with radius of 70.0 m passes the coordinate of (65 m, 30 m). The toe is at the origin (0, 0). (1) Determine the average cohesion,

A saturated and undrained clayey slope is 10-m high and the slope angle is 40 degrees. Subsurface investigation found that the subsoil is homogeneous clay with undrained cohesion of 110 kN∕m² and satu- rated unit weight of 19.5 kN∕m³. A stiff soil layer exists 5 meters below the toe of the slope. A potential toe

A 15-m-long closed-end steel pipe pile group is driven into a homoge- neous clay. The pile cap is square, and the nine piles are evenly spaced. The layout of the pile group is shown in Figure 4.25. The pile group is subjected to a vertical load of 5200 kN. The soil has a unit weight

A 30-m-long closed-end steel pipe pile group is driven into layered undrained clay. The pile cap is square, and the nine piles are evenly spaced. The layout of the pile group is shown in Figure 4.25. The topsoil layer has a unit weight of 18 kN/m³, undrained cohesion of 100 kN∕m², and a thickness of

Comprehensive mat foundation design. A mat foundation is to be designed. The dimensions of the mat are 30 m by 30 m. The stress caused by the superstructure and the mat at the bottom of the foundation is 480 kN∕m². The embedment depth of the mat foundation is determined to be 10 m below the

Comprehensive shallow foundation design. A square spread footing is to be designed to support a column. The load on the column, including the column weight, is 800 kN. The foundation rests in homogeneous sandy clay. Geotechnical investigation found the soil’s strength parameters are c′ = 38 kN∕m² and ′ = 25∘. The groundwater table is

Elastic settlement problem. As shown in Figure 3.27, a square spread footing is designed to support a column. The load on the column, including the foundation weight, is 600 kN. The dimensions of the foundation are B × B = 1.2 m × 1.2 m, and the foundation embedment depth is Df = 0.6m. The