Preloading - control of settlements, Civil Engineering

Assignment Help:

Q. Preloading - Control of settlements?

This method consists of loading the soil strata by a load intensity which will be equal to or higher than the expected load intensity. The soil strata will settle due to preloading. Later, remove the preload and construct the structure. The period of preloading depends on the time rate of settlement. Hence, if the rate of settlement is slow, then, period of preloading will be too long. The compression under preloading will be very rapid in porous soils with low relative density. Rebound after removal of preload is also less in such soil deposits. Addition of water during preloading may be advantageous, since it breaks the weak bonds in strata having silts and loosely packed sands. Organic silts, peats, sanitary fills can be precompressed effectively by preloading. Lowering of ground water table also contributes for preloading.

Reloading in the site is time consuming in soils where consolidation settlement is important unless drainage facility like sand drainslband drains, well points, electro-osmosis methods are used along with preload. Reloading is generally adopted in poor soils with relatively high water contents. With preloading, unless drainag; is rapid, pore pressure build up will take place, reducing the shear strength.


Related Discussions:- Preloading - control of settlements

Structural engg, how static and dynamic frames are works?

how static and dynamic frames are works?

Smallest size of a325 bolts needed for two plates in tension, What is the s...

What is the smallest size of A325 bolts required for the two plates in tension noted below, assuming the thickness of each plate is 1.0-in. and the applied force at each end is P=2

Particle size distribution - soil compaction, Particle Size Distribution (G...

Particle Size Distribution (Gradation): The particle size distribution is determined by passing the aggregates through a set of standard IS sieves (Figure) and determining th

Define unit hydrograph - hydrology, Define Unit Hydrograph UNIT HYDROGR...

Define Unit Hydrograph UNIT HYDROGRAPH: The hydrograph developed for a drainage basin (watershed) from the runoff of a 1 in or 1 cm storm. It is the base hydrograph from which

Properties of timber, Properties  of Timber Properties of good timbers ...

Properties  of Timber Properties of good timbers are following: Color: color should be uniform. Odour: Odour should be pleasant when cut freshly. Soundness: A cl

Question.A , #q strain gauge arrangement is used to measuuestion..

#q strain gauge arrangement is used to measuuestion..

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd