lease solve all the three a,b,c as soon as possible. A trench is to be excavated in a clay soil with γsat =20 kN/m3 and su=15 kPa. (a) Determine the theoretical maximum depth of the trench without lateral support. (b) It was decided to use a bentonite slurry of unit weight γf to fill the trench as excavation proceeds. Show that the theoretical maximum depth of the trench is Hcr = 4su / γsat - γf where γsat is the saturated unit weight of the soil and su is the undrained shear strength. (c) How much deeper can the trench be excavated by using a bentonite slurry of γf= 11 kN/m3?

Q: 9.12 An unsupported excavation is made to the maximum possible depth in a clay soil having Y, = 18…

A:

Q: Based from the previous question, if you are to put backfill in the excavated column footing given…

A:

Q: A hole was made in a stiff saturated soil having a Gs = 2.71 and moisture content of 0.30. The sand…

A: Given Gs = 2.71 w = 0.3 Water level in the hole is 6.3 m

Q: PROBLEM No. 2 Void Ratio Soil excavated from a borrow area is being used to construct an embankment.…

A:

Q: QI- An embankment is to be constructed over a layer of soft clay 16 m thick as shown in figure 1.…

A:

Q: Civil Engineering 4) a) The soil reinforced retaining wall shown in figure Q4 is founded on sand…

A:

Q: Exploratory drill hole 12m 8m 4.5 m An exploratory drill hole was made in a stiff saturated clay…

A: Given data: w=22%Gs=2.16 water table is 8m above the sand layer.

Q: (b) It was decided to use a bentonite slurry of unit weight y, to fill the trench as excavation…

A:

Q: An embankment for a highway 35m wide and 1.2m in compacted thickness is to be constructed from a…

A: Given data- An embankment for a highway 35m wide and 1.2m in compacted thickness. The water content…

Q: Civil Engineering The cohesion (c), angle of internal friction (0) and unit weight (y) of a soil are…

A: Given- Cohesion of the soil-C=15 kPaangle of internal friction-ϕ=20ounit weight of the soil -γ=17.5…

Q: Given the follow an earthworks fo

A:

Q: An embankment for a highway 30 m wide and 1.3 m in compacted thickness is to be constructed from a…

A:

Q: B) ) A river bed consists of sand layer overlying impermeable rock; the depth of water is in river…

A:

Q: An unsupported excavation is made to the maximum possible depth in a pure clay soil having density…

A:

Q: 4. What is the culvert bottom slope denoted as? a) sl b) SL c) So d) sL

A: The culvert bottom slope denoted  as c) So Other , options doesn't exist. Correct option is C

Q: What is the cross-sectional area of the Grit chamber (rectangular) in m² required, if the average…

A: Given data: Average daily flow rate = 600 m3d                                      =60024×60=0.4167…

Q: The following is a sketch of the proposed embankment, calculate the addition of vertical stress…

A:

Q: A 4 m high embankment with a top width of 5 m and side slopes of 1:1, has to be constructed by…

A:

Q: O A long excavation with vertical sides and depth-to-width ratio of 0.5 is to be made in a deep…

A:

Q: A wide excavation is made on a site which has the following soil conditions: 0-2 m Gravel:…

A: Given data -  For - 0-2 m Gravel:                          gsat = 21.8 kN/m3, gdry =          18.5…

Q: 2 An unsupported excavation is made to the maximum possible depth in a clay soil having Y₁ = 18…

A:

Q: A 4 m high embankment with a top width of 5 m and side slopes of 1:1, has to be constructed by…

A: GIVEN: A 4 m high embankment with a top width of 5 m and side slopes of 1:1, has to be constructed…

Q: Calculate the forces on the supports in the internally supported excavation system given in the…

A: In soil, lateral pressure refers to the force acting in horizontal directions. Designing bridge…

Q: 2.1.Q.1: Determine the total vertical stress, pore water pressure, and the effective stress of the…

A:

Q: .Draw the lateral earth pressure distribution with depth. Calculate the depth of penetration (D). .…

A: “Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: What will be the factor of safety against seepage if cohesion is 19 kPa, angle of backfill is 32…

A: Given- A soil having cohesion 19kPa, retained at an angle of 32°  Required-to find factor of safety…

Q: 3.24 Refer to the 15-ft high embankment shown in Figure 3.8. Embankments are generally constructed…

A: Given information:

Q: An excavation of 25,750 m3 (bm) is to be made for the foundation excavation of a building in 5 weeks…

A: Hauling is the movement of material by mobile units such as road vehicles and rail locomotives. Road…

Q: Determine (a) the lateral earth pressure distribution for the braced cut analysis (including shape…

A:

Q: In a clayey soil having 50 kN/m² as unit cohesion and 18 kN/m³ as unit weight, an excavation is made…

A: Given data- Cohesion C=50 kN/m2Unit weight γ=18 kN/m3Taylor's Stability number Sn=0.261To…

Q: A stiff clay layer of 11.02 m thickness with a unit weight of 17.52 kN/m³ overlies a sand layer. The…

A: Given: The thickness is 11.02 m. The unit weight is 17.52 kN/m3. The depth of excavation is 8.52 m.

Q: i Example 23.7. ihrough a soil having the following characteristics: c = 14 kN/m; = 15° e = 0.8 and…

A:

Q: find the critical slope angel for completely waterlogged silty peat , unit weight 12kN/m2 , friction…

A: The unit weight of soil is γ=12 kN/m3. The frictional angle is ϕ'=40∘. The unit weight of water is…

Q: The cohesion (c), angle of internal friction () and unit weight (y) of a soil are 15 kPa. 20° and…

A:

Q: IN A 6M THICK STRATUM OF FINE SAND HAVING SUBMERGED DENSITY OF 11KN/M³, QUICK SAND CONDITION OCCURS…

A:

Q: A 3 m high embankment is to be constructed as shown in the figure. If the unit weight of soil used…

A:

Q: A 3 m high embankment is to be constructed as shown in the figure. If the unit weight of soil used…

A: Given data A 3m high embankment unit weight of soil used in embankment = 19KN/m3 we have to…

Q: B E F G D K H. L if each square measures 35.24 square meters and A= 5.84m, B=7.77m, C=8.08m,…

A: VABDE = (A+B+D+E)/4 x area = (5.84+7.77+2.13+8.35)/4 x 35.24 = 212.2329 m

Q: A new underground tunnel section is designed by a geotechnical consultant. For the underground…

A: Given, c= 20kN/m2 ϕ=0γ=18.5 kN/m2γHc=18.5×720=6.47>4

Q: An unsupported excavation is made to the maximum possible depth in a clay soil having Y₁ = 18 kN/m³,…

A:

Q: An unsupported excavation is made to the maximum possible depth in a clay soil having Y, = 18…

A: Given data- Clay soil-unit weight γ=18 KN/m3cohesion C=100 kN/m2Angle of friction-ϕ=30oTo…

Q: if each square measures 35.04 square meters and A= 9.05m, B=5.8m, C=4.33m, D=9.92m, E=2.73m,…

A:

Q: An embankment consists of clay fill for which c=25 kPa and angle of internal friction is 260 9from…

A:

Q: Determine the value of the critical hydraulic gradient if the specific gravity of the soil is (Gs =)…

A: Given: Specific gravity, Gs = 2.67 Void ratio, e = 0.45 Hydraulic gradient, i = 0.46

Q: An embankment consists of clay fill for which c=25 kPa and angle of internal friction is 260 9from…

A: Given:- C=25 kPaϕ=26oΥ=18.64 KN/m3Z=20 m To find:- Stress at a depth of 20 m Free body diagram

Q: The braced cut of two layers of clay is shown in the f H; = 3 m; y1 = 14 kN/m³¸ c; = 25 kN/m? H; = 3…

A: According to given data

Q: An excavation is to be made in a layer of clay which is 10 m thick and underlain by a sandstone…

A: Given: The thickness of clay layer is 10 m. The saturated unit weight of clay is 21 kN/m3. The water…

Q: A circular footing (2.0 m diameter) with q = 200 kN/m² is placed on a hard clay soil layer. Estimate…

A: Given: B=2 mq=200 kNm2 The formula for immediate settlement: Si=qBEs1-μ2I

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.