This blog explain the different possibility of foundation on sloping ground, different alternatives, pros & cons, recommendation of Indian standard, etc. So read the article till the end & if you get any valuable information from this then please share it with your friends.
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Foundation on Sloping Ground
A building on sloping ground looks so crazy, gives better views, landscaping as well as also provide a good natural lighting and ventilation. There is lots of points that makes end user more happy by constructing a house on sloping ground, except that clients are avoiding to construct a building or house on sloping ground due to higher requirement of cash flow as compare.
To construct a building on sloping ground require a lots of time, skillful manpower and special machineries which directly increases the requirement of money in that project. Also, structural engineers avoiding a construction on sloping ground due to complex foundation system, etc..
Here is the list of challenges that makes foundation more complex on sloping ground.
- Soil Erosion
- Un-even load distribution
- Drainage issues
- Slope Stability
- Foundation on filled-up soil, etc.
If you want to learn more about challenges of foundation on sloping ground then this article helps you to understand about The Problems of Building a House on Sloped Land? in full depth.
Here we are accumulated to know, what is the solution for foundation on sloping ground, what are the recommendation given by indian standard, etc. So here is the solution,
A clause of indian standard IS 1904 : 2021 explain the construction and design measures for foundation on sloping ground.
As per clause 8.0, foundation at different level,
Where footings are adjacent to sloping ground or where the bottoms of the footings of a structure are at different levels or at levels different from those of the footings of adjoining structures, the depth of the footings shall be such that the difference in footing elevations shall be subject to the following limitations:
a) When the ground surface slopes downward adjacent to a footing, the sloping surface shall not intersect a frustum of bearing material under the footing having sides which make an angle of 30° with the horizontal for soil and horizontal distance from the lower edge of the footing to the sloping surface shall be at least 600 mm for rock and 900 mm for soil (see Fig. 1).
b) In the case of footings in granular soil, a line drawn between the lower adjacent edges of adjacent footings shall not have a slope steeper than one vertical to two horizontal (see Fig. 2).
c) In case of footing in clayey soils, a line drawn between the lower adjacent edge of the upper footing and the upper adjacent edge of lower footing shall not have a steeper slope than one vertical to two horizontal (see Fig. 3).
The requirement given in 8.1 shall not apply where adequate provision is made for the lateral support (such as with retaining walls) of the material supporting the higher footing.
Reference:
- IS 1904 : 2021 General Requirements for Design and Construction of Foundations in Soils