A 50-ft 2x4 drilled shaft group was installed in subsoil conditions, ( 15-ft sand overlain a 25-ft medium clay, which is underlain by a thick over-consolidated clay shale). The drilled shafts are tipped in clay shale at 50-ft depth to support a heavy highway bridge pier. The shaft diameter is 36 inches and placed at a center-center spacing of 6 feet. The strength properties of soils are 37^ofriction angle for the sand with unit weight of 125 pcf, undrained shear strength of medium clay is 1,800 psf with unit weight of 130 pcf and the undrained shear strength of the heavily over-consolidated clay shale 3,000 psf with the unit weight of 140 pcf. Compute the design bearing capacity of the drilled shaft group with the factor of safety 2.5.

Note: When you suspect some missing information, please make reasonable assumption(s) and proceed with your solution. Clearly show why the assumption(s) is needed.

A 1000- MW power plant burns coalwith a heating value of 25000Btu/kg, a sulfur content of 2.1%, and an ash content of 8%.

The plant has an overall conversion efficiency of 30%. Calculate:

a. The coal consumption rate in tons/hour.

b. The ash generation rate in tons/hour.

c. If a wet scrubber is added to remove 98% of the SO2, find the CaO consumption rate, also in tons/hour.

1W = 3.411Btu/hr
1hp = 746W = 2545 Btu/hr
Molecular weights: S = 32 gr, H = 1 gr, and O = 16gr, and Ca = 40gr

Potentially, which models would be used for traffic flow ? provide one example with an mathematical explanation

what is 1971 OSHA ACT 5a1?
what is competent person, qualified person ?
reference from 29CFR 1926 OR 1910

A 105-acre rural drainage area, located in the Eastern Panhandle of WV, consists of three different watershed areas as follows: (Use the Rational Method) Pavement = 50%, earth shoulder = 30% and grass shoulder = 20%, assume 1% slope

If the time of concentration for the drainage area is 30 minutes, determine the peak runoff rate (Q) for a storm of 10 yr frequency.

Submit the following answers:

Time of concentration (TC) =

Rainfall intensity (i) =

Runoff Coefficient (C) =

Q10 =

What are the advantages and disadvantages of using Rankine theories for lateral earth pressure calculation?

Subject: Foundation engineering.

A liquid flows tangentially past a flat plate of dimensions total length of 4 m (parallel to the flow direction) and width of 1.5 m. fluid velocity is 1 m/s (length wise). What is the skin friction drag (shear force) on both sides of the plate? liquid density = 1000 kg/m³, dynamic viscosity = 2 x 10-2 N*s/m².

Can you write an abstract of 300 words about (Asphalt pavement: traditional hot mix asphalt vs. warm mix asphalt based on Life Cycle Assessment)? Include REFRENCE!!!!

Thank you

1.state 3 impacts each of nitrate, phosphorus and sulphur on the environment.

2. What is the name of the bacteria that begins the nitrofication process and write the chemical reaction of the nitrofication process

3.Describe biological oxygen demand
4. Describe chemical oxygen demand tests

Discuss the different estimating techniques that are used for construction projects by answering the following questions in your post:

• What are the three most common types of estimating techniques, and in what situation is it most appropriate to use each one?
• What else is important to consider when deciding which technique to use?

Construction Engineering question: Produce a environmental management plan

Company has been awarded the contract for a bridge replacement, including 2km approach resurfacing on each side and has placed you and your team in charge. Produce a environmental management plan. Thanks!!

Determine the batch weights needed for all materials for a 10 yd³ batch given the following information. Show all work for partial credit.

Slump = 4 inch maximum

w/cm = 0.45

Cementitious content = 525 lbs/yd³

Slag content = 30% by weight

Fly ash content = 30% by weight

CA (limestone) specific gravity (SSD) = 2.49

FA (sand) specific gravity (SSD) = 2.58

Cement (type I) specific gravity = 3.14

Slag (grade 100) specific gravity = 2.86

Fly ash (class C) specific gravity = 2.59

Air content = 1.0 percent (non-air entrained)

CA absorption = 1.0%

CA moisture content = 2.5%

FA absorption = 1.5%

FA moisture content = 3.3%

Aggregate Volume: 55% CA, 45% FA

Design an overflow spillway profile for a design discharge of 1200 m3/s.

The upstream water surface level is at an elevation of 220 m and the upstream channel floor is at 180 m.

The spillway, having a vertical face, is 40 m long.

How do differences in ax  affect the arrival time of the leading edge of the contaminant plume

What are different types of live loads consider in the design of RCC bridges