An excavation is to be performed in a stratum of clay, 9 m thick, underlain by a bed of sand. In a trial bore hole, the ground-water is observed to rise up to an elevation 3 m below ground surface.Find the depth of which the excavation can be safely carried out without the bottom becoming unstable under uplift pressure of ground-water. The specific gravity of clay particles is 2.70 andthe void ratio is 0.70. If the excavation is to be safely carried to a depth of 7 m, how much should the water table be lowered in the vicinity of the trench ? a. 9 m b. 6 m c. 10 m d.

Q: Not sure how to do this one. Would appreciate a full solution. Thank

A:

Q: 4. A site associated with an excavatic Below the sand layer lies a 6m thick located at the ground…

A: Time factor T is calculated as  ;where ;Cv = Coefficient of consolidation = 0.015m3 /dayt = time =…

Q: underlying the clay was under artesian An exploratory drill hole was made in a 32%. It was observed…

A:

Q: Assume a consolidated drained triaxial compression test is to be performed on a medium stiff clay…

A:

Q: For the given problem, the failure plane was inclined at an angle of 35° with the vertical to find…

A:

Q: A clay layer 5 m thick has double drainage. It was consolidated under a load of 127.5 kN/m2. The…

A: Given Data:Thickness of layer=5mdouble drainageLoad=127.5 kN/m2Increased load=197.5 kN/m2Coefficient…

Q: A site associated with an excavation project is underlain by a 6m thick sand layer with unit weights…

A: Time factor T is calculated as  ; T = Cv td2  where ; Cv = Coefficient of consolidation = 0.018 m2…

Q: Three consolidated-undrained tri-axial tests were performed on samples retrieved from a 4 meter…

A: GIVEN DATA :- TEST  CHAMBER PRESSUER DEVIATOR STRESS PORE PRESSURE 75 75 166 -12 150 150 295…

Q: a consolidated drained trial test was conducted on a normally consolidated clay with majo minor…

A:

Q: A large building is to be built on a thick layer of normally consolidated clay shown in the figure…

A: For the given soil profile, OCR is known as over-consolidation ratio. It is the ratio of…

Q: A consolidated-undrained test on a normally consolidate clay yield the following results: Confining…

A:

Q: A triaxial test conducted on a normally consolidated clay in drained condition yielded the following…

A:

Q: Two similar clay soil samples were pre-consolidated in triaxial equipment with a chamber pressure of…

A:

Q: Use 10 kN/m³ for the unit weight of water. Question 7 A site is underlain by a 6m thick saturated…

A:

Q: In a consolidation test, when the load is changed from 50 kN/m² to 100 kN/m², then the void ratio…

A: Given data- A consolidation test- Load is changed from 50 kN/m2 to 100 kN/m2, Void ratio changes…

Measuring site work, Excavation and Piling

Bid drawings typically include very little material about the precise requirements of site work operations, measuring site work and excavation work differs from measuring most other works on a construction project. The actual site work conditions are not provided and also the dimensions of the excavations are not known during the pre-construction phase. The precise measurement of the excavation and backfill of the earth material and topsoil is important for a contractor to decide upon the total cost required for the process. All the works should be carried out under OSHA (Occupational Safety and Health Administration) standards to ensure the safety of the workers.