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

Beams, how to convert uniformly varying loads to point loads

how to convert uniformly varying loads to point loads

Concrete structure, which section is most effective for a design of beam an...

which section is most effective for a design of beam and why

Proctor test for GSB material, what is the procedure for gsb proctor test f...

what is the procedure for gsb proctor test for matrial sampling for lab density

What is diaphragms in bridges, Q. What is Diaphragms in bridges? Diaph...

Q. What is Diaphragms in bridges? Diaphragms in bridges The principal function of diaphragms is to provide stiffening effect to deck slab in case bridge webs aren't situat

Maximum shear stress , the propane gas tank has an inner diameter of 1500mm...

the propane gas tank has an inner diameter of 1500mm and wall thickness of 15mm. If the wall is pressurized to 2MPa, determine the absolute maximum shear stress in the wall of tank

What is switch and expansion joint, Q. What is Switch and Expansion Joint? ...

Q. What is Switch and Expansion Joint? Switch Expansion, Joint (SEJ) is an expansion joint installed at each end of LWR/CWR to permit expansion/contraction of the adjoining bre

State about the pre-tensioned concrete beam, State about the pre-tensioned ...

State about the pre-tensioned concrete beam A pre-tensioned concrete beam, 200 mm wide and 300 mm deep, is prestressed by straight wires carrying an initial force of 150 kN at

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