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

What is rapid sand filter, Q. What is Rapid Sand Filter? A Rapid Sand F...

Q. What is Rapid Sand Filter? A Rapid Sand Filter is a water treatment plant that includes provision for pre treating the water by coagulation and sedimentation for settlement

Principle of adding cooling pipes, Question What is key principle of a...

Question What is key principle of adding cooling pipes or yet using cold water for concrete in concreting operation? Answer These methods aim at reducing placing tem

Explain rcra and hswa - hazardous waste regulations, Explain RCRA and HSWA ...

Explain RCRA and HSWA - Hazardous Waste Regulations 1. In 1976, Congress passed the Resource Conservation and Recovery Act (RCRA) and directed EPA to establish hazardous waste

Supply each tremie pipe with a single concrete truck, Question Througho...

Question Throughout concreting of diaphragm walls , three tremie pipes are used in single time. But, only one concrete truck is obtainable. How have to concreting works been a

Stress design method, You have been selected to assist the structural engin...

You have been selected to assist the structural engineer for a bridge replacement project.  Your task is to design the size of the footing for an interior bridge pier, based on the

Define abrasion - underwater inspection of bridge, Define Abrasion - underw...

Define Abrasion - underwater inspection of bridge? Deterioration of substructures by abrasion is caused by wave action, the velocity of the currents and the action of suspended

Estimation specification and costing, Estimate the single room of size 3m x...

Estimate the single room of size 3m x 4m x height 3m using individual wall method?

Pressure distribution under rigid and flexible footings, Pressure distribut...

Pressure distribution under rigid and flexible footings For rigid and thick footings, pressure distribution under the footings is generally presumed to be linear. If symmetric

Function of waterproof membrane for concrete carriageway, Q. Function of wa...

Q. Function of waterproof (or separation) membrane for concrete carriageway A layer of waterproof (or separation) membrane is usually placed between sub-base and concrete slab

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