ConsMeth Flashcards
Find the swell of a soil that weighs 1661 kg/m3 in its natural state and 1186 kg/m3 after excavation.
40%
Find the shrinkage of a soil that weighs 1661 kg/m3 in its natural state and 2077 kg/m3 after compaction.
20%
A soil weighs 1163 kg/LCM, 1661 kg/BCM, and 2077 kg/CCM. (a) Find the load factor and shrinkage factor for the soil. (b) How many bank cubic meters (BCM) and compacted cubic meters (CCM) are contained in 593,300 LCM of this soil?
(a) 0.70 & 0.80
(b) 332,248 CCM
Find the base width and height of a triangular spoil bank containing 76.5 BCM if the pile length is 9.14 m, the soil’s angle of repose is 37°, and its swell is 25%
2.8 m
Find the base diameter and height of a conical spoil pile that will contain 76.5 BCM of excavation if the soil’s angle of repose is 32° and its swell is 12%.
Diameter= 10.16 m, Height= 3.17 m
Estimate the volume of excavation required (bank measure) for the basement shown in Figure 3. Values shown at each corner are depths of excavation. All values are in meters.
146.6 BCM
Find the volume (bank measure) of excavation required for a trench 0.92 m wide, 1.83 m deep, and 152 m long. Assume that the trench sides will be approximately vertical.
255 BCM
Find the volume of excavation required for the area shown in Figure 4. The figure at each grid intersection represents the depth of cut at that location. Depths in parentheses represent meters.
14,596 BCM
Estimate the actual bucket load in bank cubic yards for a loader bucket whose heaped capacity is 3.82 m3 The soil’s bucket fill factor is 0.90 and its load factor is 0.80.
2.75 BCM
Find the expected production in loose cubic meters (LCM) per hour of a small hydraulic excavator. Heaped bucket capacity is 0.57 m3 The material is sand and gravel with a bucket fill factor of 0.95. Job efficiency is 50 min/h. Average depth of cut is 4.3 m. Maximum depth of cut is 6.1 m and average swing is 90.
Hint: Production (LCM/h) = C x S x V x Bx E.
113
Find the expected production in loose cubic meter (LCM) per hour of a 2.3-m3 hydraulic shovel equipped with a front-dump bucket. The material is common earth with a bucket fill factor of 1.0. The average angle of swing is 75° and job efficiency is 0.80.
Hint: Production (LCM/h) = C x S x V x Bx E.
290 LCM/h
Determine the expected dragline production in loose cubic meters (LCM) per hour based on the following information: Dragline size= 1.53 m3 Swing angle= 120° Average depth of cut= 2.4 m Material = common earth Job efficiency= 50 min/h
165 LCM/h
Estimate the production in loose cubic meters per hour for a mediumweight clamshell excavating loose earth. Heaped bucket capacity is 0.75 m3. The soil is common earth with a bucket fill factor of 0.95. Estimated cycle time is 40 s. Job efficiency is estimated at 50 min/h.
53 LCM/h
A wheel tractor-scraper weighing 91 t is being operated on a haul road with a tire penetration of 5 cm. What is the total resistance kg and effective grade when (a) the scraper is ascending a slope of 5%; (b) the scraper is descending a slope of 5%? Hint: Rolling resistance factor (kg/t) = 20+ (6 x cm penetration)
(a) R=9100 kg,G= 10%
(b) R=0,G=0%
A crawler tractor weighing 36 t is towing a rubber-tired scraper weighing 45.5 t up a grade of 4%. What is the total resistance kg of the combination if the rolling resistance factor is 50 kg/t?
5535 kg
