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SOIL LIQUIFICATION

 
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aditya_bidikar
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Joined: 29 Mar 2011
Posts: 2

PostPosted: Fri Aug 19, 2011 4:27 am    Post subject: SOIL LIQUIFICATION Reply with quote

Dear all,

Are there any measures by which we can prevent soil liquification. If yes what are they?. What kind of foundation should we go for? I am having a structure to be designed in Seismic Zone 4 in which the soil report gives a bearing capacity of 15t/m2. The report also suggests chances of liquification.

Need your guidance.
Regards Aditya
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gpsarathyy
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Joined: 28 Jun 2010
Posts: 484
Location: chennai

PostPosted: Fri Aug 19, 2011 7:58 am    Post subject: Reply with quote

Dear Sefian,

Soil liquifaction is caused due to less bonding between the soil particles.
It can be rectified by doing soil stabilisation to make the soil more compact.
1. Mechanical or chemical soil stabilisation
2. Stone column foundation shall be provided which will also improve the soil compaction

Pile foundations needs to be provided in these areas.

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G.PARTHASARATHY M.E. CEng(UK), MICE., MIE.,
CHENNAI
GPSARATHYY@GMAIL.COM
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gpsarathyy
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Joined: 28 Jun 2010
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Location: chennai

PostPosted: Fri Aug 19, 2011 8:02 am    Post subject: Reply with quote

Please refer the following link

http://www.sefindia.org/forum/viewtopic.php?t=428&sid=6beac0c0f3590db5288201fecbc5f016

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G.PARTHASARATHY M.E. CEng(UK), MICE., MIE.,
CHENNAI
GPSARATHYY@GMAIL.COM
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atul_123
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Joined: 29 May 2009
Posts: 369
Location: VADODARA, GUJARAT, INDIA.

PostPosted: Thu Sep 08, 2011 7:33 am    Post subject: Reply with quote

go through this site


http://en.wikipedia.org/wiki/Soil_liquefaction


also find attached file
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rajancivildesign@gmail.co
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Joined: 26 Jan 2011
Posts: 537

PostPosted: Thu Sep 08, 2011 10:25 am    Post subject: SOIL LIQUFICATION Reply with quote

Dear SAFIAN,
As the N value is less than 15 in case of Isolated footing or in case of fine sand or uniform sand where effective stress is zero, Liqufication take place. If 'N' value is more than 15 within 5 m  depth, Isolated footing with tie beam in between shall be provided. Otherwise, it is better to go for deep end bearing pile to anchor the foundation in rocky or firm strata. I donot think there is any other method to improve the foundation. Senior person may advise any other alternate in this regard.
V.M.RAJAN.
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gpsarathyy
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Location: chennai

PostPosted: Thu Sep 08, 2011 12:17 pm    Post subject: Reply with quote

Dear Sefian,

I have checkedup with the IIT Professor at Madras - soil mechanics. As per their advice if the N value is less than 10, then it is succeptible to liquefaction.

Liquifaction also depends on many factors like:
1. If it is made dense soil by compaction, the N value will increase and the chance of liquefaction will come down.
2. If the soil is contained by some other deep foundations sheet piling or pile foundations of other structures, which will not allow the soil to behave as the liquid due to constraint from all directions. Hence the soil liquifaction can be avoided.
3. Last option is to go for deep foundation - with pile foundations - without considering the soil liquefaction depth in the design calculations.
4. I have used pile foundations for the major structures and category-1 structures for the similar type of condition.
5. Stone column foundations also used for the larger foundations with uniform loads.

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G.PARTHASARATHY M.E. CEng(UK), MICE., MIE.,
CHENNAI
GPSARATHYY@GMAIL.COM
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