In general the it is better to mine a tunnel upgrade (uphill) rather than downgrade because the upgrade has (a) more favorable discontinuity orientation (b) water in tunnel will drain away from tunnel face (c) gravity better assists in mining tunnel face (d) downgrade from tunnel face speed up muck removal (e) all answers apply

The answer needed is only for part C.

A) Willow and Stevens are two-way streets in an urban area. A four-phase operation is used for the intersection of Willow and Stevens with a cycle time of 110 seconds, including 15 sec Green for the left turn (LT) vehicles on each street. If the green time for the through (TH) vehicles on Willow is 30 sec, determine the green time for the through (TH) vehicles on Stevens and construct the signal timing cut-out diagrams for vehicles only without considering pedestrians. Assume a clearance (Yellow 3 sec + All Red 2 sec) time of 5 seconds when the green light is switched between Willow and Stevens (but do not use the clearance time when the signal changes from LT to TH on the same street. B) The width of Stevens Avenue is 52 feet. How long should be the Flash Don’t Walk (FDW) duration if the walking speed of pedestrians is 4 feet/sec?

C) If the minimum headway is 2 sec, delay per phase is 4.6 sec, and there are two through lanes and one left-turn lane on Willow in each direction, how long should be the cycle time if the combined (LT + TH) traffic volume on this street is 3000 vehicles/hour?

What is plumbing ? What are the requirements for doing plumbing works and moisture insulation in bathrooms. Also how are installed and inspected later, what are the risks associated with their installation and what would be the safety measures then? What is the right sequence to follow while installing such materials?

Compare work place safety in the 1890’s and early 20^th century, as compared to today safer working conditions

Please explain, be as detailed as possible

For a dual-media filter with 0.5 m of anthracite coal and 0.3 of sand. Other data for anthracite: specific gravity is 1.67, porosity is 0.5, d₉₀ grain size is 1.5 mm. Other data for sand: specific gravity is 2.65, porosity is 0.4, d₉₀ grain size is 0.9 mm. The water temperature is 20C, so the mass density of water (ρ) is 998.2 kg/m³ , density of sand is 1650 kg/m³ , density of anthracite coal is 1506 kg/m^3, the absolute viscosity is 1.002 x 10^-3 kg/m-s. Assuming a 30% margin of safety for backwash, calculate the following:

a) the recommended backwash rate for the filter (gpm/sf)

b) the pressure drop through the filter during fluidization (psi)

Note: multiply (L/m²-s) by 1.473 to get gpm/sf. Multiply (N/m²) by 0.000145 to get psi.

Two discharge wells (1 and 2) penetrating an unconfined aquifer are pumped at constant rates of 3,000 and 500 m^3 per day , respectively. The steady-state head (i.e., water table height) measured at an observation well is 40 meters . The observation well is 50 meters from well 1 and 64 meters from well 2. The water table height measured at a second observation well is 32.9 meters , which is located 20 meters from well 1 and 23 meters from well 2. Determine the aquifer permeability K (in m/day).

Q4. A rigid strip footing is constructed on a layered soil deposit, as shown in the figure.

Before construction of the footing, laboratory tests on a saturated clay sample, taken at a depth of 6 m below the ground surface, gave the following results:

• Compression index: C_c = 0.3,
• Recompression index: C_r = 0.08  
• Over consolidation ratio: OCR = 1.5
• Water content: w = 25%
• Specific gravity: G_s = 2.65

Saturated unit weight of clay: g_sat = 19.5 kN/m³

1. Calculate the settlement of the footing due to deformation of the sand layer only. Sand properties are as follows:         

• Total unit weight: g_t = 18 kN/m³             
• Young’s modulus: E_s = 30 MPa                 
• Poisson’s ratio: n = 0.25

2. Based on the elastic theory (Boussinesq’s equation), calculate the change in vertical stress at point A long time after applying the surcharge load.
3. Using the theory of 1-D consolidation, calculate the total settlement of this rigid footing due to consolidation of the clay layer only, long time after applying the total load.

Q3. The total load of a chimney and its circular footing is 35 MN, as shown in the figure. Assume the average unit weight of soil below and above the water table is the same.

• Presume: B (diameter) = 8 m, H = 6 m, and D = 2 m.

According to SPT results, the average N-value for sandy soil below the footing is 20.

1. Estimate the values of the friction angle and the average unit weight of soil based on N-value.
2. Determine the factor of safety of this footing against the bearing capacity failure using Hansen’s equations.

As a groundwater engineer, it is our responsibility to keep the stakeholders aware of information and insights related to the containment of any factors that cause groundwater contamination. Extensive knowledge among the community on this matter will contribute to a sustainable conservation of groundwater resources at all level of ages. Develop a best method and approach to achieve this goal based on the following criterias :

i. Knowledge, perception and understanding of groundwater contamination.

ii. Perceptions of groundwater quality in terms of impacts and consequences for each sector though comparisons in two different situations.

Course: CIVE 4309: SOLID WASTE MANAGEMENT

Subject: Case study

landfill area and state fully the operational method that applies to chosen landfill The slide presentation must have:

1) The definition of landfill

2) Background of the chosen landfill

3) Landfill operation should include:

1) Landfill layout and design

2) Landfill operation and management (include the diagram)

3) The reaction occur in the landfill

4)The management of leachate o Environmental monitoring (Gas monitoring)

5) Landfill closure

Assessment based on the rubric

with resources.

1. Estimate the length of a 600mm diameter bored pile required to support an unfactored load of 1200 kN. The pile is embedded in a cohesive soil with an average undrained shear strength of 150 kPa and bulk unit weight = 20 kN/m³. The adhesion factor, alpha, may be assumed to be 0.4. The required overall factor of safety is to be at least 3.0. (Assume the density of the pile is equal to the density of the soil).

Hint: Express the capacity of the pile in terms of the unknown length, L. Solve for L

2. For the pile in a) estimate the pile head settlement under the unfactored load. The Young’s Modulus of the soil may be assumed to be 230 times the average undrained shear strength. Take the Young’s Modulus of concrete to be 27 GPa.

3. If this pile is part of a group of 8 piles (each with a load of 1200 kN) arranged in a 3 -2 - 3 pattern, estimate the settlement of this pile group at the pile cap level.

What are the main issues of the construction industry, including its economics, statistics, technological advances and challenges?

In your opinion, how this pandemic changed the way of engineering education in universities as well as engineering career post-Covid-19 and how you as a newly-graduated engineer can still contribute to the United Nation Development Plan (UNDP) Sustainable Development Goal (SDG) 2030 despite this pandemic challenge?

USE TYPING

In retrospect to the currently challenging global economic state, recommend five (5) preemptive or anticipatory actions from the perspective of engineering economics that could be taken by engineers in ensuring their organization will continue to survive.