Grade ID (in) Weight (lb/ft) Coupling type Collapse Resistance H40 9.001 32.3 STC 1522 K55 8.921 36 BTC 2244 L80 8.835 40 LTC 3433 C90 8.755 43.5 BTC 3611 C95 8.681 47 LTC 5655

Describe the procedure of he constant-rate-of-penetration test.

A project in coarse-grain sandstone is being investigated. Field drilling tests proved that air-track drills with 4-in. B bits can achieve a penetration rate of 2.1 ft/min. Assume that it takes 5 min to change a bit. The drills use 12-ft steel. The blasting pattern will be 8 × 10 ft with 2 ft of subdrilling. The average depth to finish grade is 18 ft. The drilling production must match that of the loading and hauling operations, which is 320 bcy/hr. Assuming a 45-min production hour drilling, how many drill units will be required?

Borings advanced by wash boring methods through cohesion less soils or below water are subject to cave-in. To prevent this, it is typical to drive a protective casing around the boring. Describe about the casing and how it is helpful?

A 48” O.D., 3/4” steel wall pipeline is buried under the bottom of a harbor. It is proposed that the minimum cover for the pipe under the bottom is 2'. The saturated unit weight of the soil is 110 pcf.  Compute the net force on the pipe. Will it float to the surface without the shear resistance of the soil?

Read the question carefully and give me answer according to the question  Describe situations in which drilled shafts would be preferable to driven pile foundations

Describe about the consolidated–undrained (C–U) shear test.

Regarding geotextiles used in separation, what is the required burst pressure of a geotextile supporting 75-mm maximum-size stone and heavy trucks with a tire inflation pressure of 1000-kPa?   Use  (where p’ = the pressure at the geotextile interface and p = the inflation pressure); a cumulative reduction factor = 2.0; and a factor of safety = 2.0.

Subject: Geotechnical engineering Please Give me complete a, b and c correct solutions otherwise leave it.... Thank you

Describe about the sand-cone method and the rubber-balloon method.