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Sunday 20 January 2013

FIELD & LABORATORY TEST OF SOIL INVESTIGATION FOR THERMAL POWER PLANT

We have attached two photographs only to make aware of the site situation and try to give the picture of scope . First picture shows the amount of structural work ( fabrication and erection ) to be done only for Power House Building. It also shows the stages of civil work i.e pile cap , foundation raft and foundation . Preparation of foundation casting etc. 2nd picture shows that the piles are exposed through excavation now pile head has to be removed and cap to be made as shown in the picture.  

We have discussed about Boreholes to be done in the powerhouse. In fact all the boreholes and specific feild test to be carried out at site will be marked in the GLP ( General Layout Plan) with marked  latitude and longitude. Even the bench mark to be established from GSI bench mark. Other field tests are to be carried is given below. Please note that i have chosen a site where piling is necessary there may be other sites where piling is not necessary but rock cutting is required then specification and requirement will be altered.

S.N0                                           TEST UNIT                                                    
1                                     STAND PIPES                                            METRE 
2                                     PIEZOMETERS                                          NOS 
3                                     TRIAL PITS                                                CUM 
4                                     FIELD PERMEABILITY
a                                       PUMP IN TEST                                        NOS 
b                                       PERCOLATION TEST                            NOS  
c                                       PERMEABILITY IN ROCK                    NOS 
5                                     SCPT                                                         METRE   
6                                     DCPT                                                        METRE             
7                                     PLT                                                            NOS
8                                     CPLT                                                         NOS 
9                                     ERT                                                           NOS 
10                                   SRT                                                           METRE                                
11                                   PMT                                                          NOS 


Above field tests are to be conducted in most of the power station. Quntity will be differed site to site and Size of the station . Beside that lot of laboratory tests are performed on sample collected from field. The details are given below. 

S.N0                                                               TEST                                                     UNIT 
1                                         BULK DENSITY & MOISTURE CONTENT                  NOS 
2                                         SIEVE ANALYSIS                                                           NOS 
3                                         HYDROMETER ANALYSIS                                           NOS 
4                                         LIQUID LIMIT & PLASTIC LIMIT                                  NOS 
    a                                     SHRINKAGE LIMIT                                                         NOS 
    b                                     SPECIFIC GRAVITY                                                       NOS 
    c                                     STANDARD PROCTOR COMPACTION TEST             NOS 
   d                                      MODIFIED PROCTOR DENSITY TESTS                     NOS 
5                                         SWELL PRESSURE                                                        NOS 
6                                         FREE SWELL INDEX                                                     NOS 
7                                         RELATIVE DENSITY                                                     NOS 
8                                         UNCONFINED COMPRESSIVE STRENGTH               NOS 
9                                         DIRECT SHEAR TEST                                                    NOS 
10 TRIAXIAL SHEAR TEST
  a                                       UU TEST                                                                           NOS  
  b                                       CU TEST
  c                                       CD TEST                                                                           NOS  
11                                       ONE DIMENSIONAL CONSOLIDATION TEST           NOS 
12 CHEMICAL ANALYSIS
  a                                       SOIL SAMPLES                                                               NOS
  b                                      WATER SAMPLES                                                          NOS 

ROCK SAMPLES

13                                     MOISTURE CONTENT,POROSITY AND DENSITY     NOS
14                                     SPECIFIC GRAVITY                                                        NOS 
15                                     HARDNESS                                                                       NOS 
16                                     SLAKE DURABILITY                                                       NOS 
17                                     UCC                                                                                    NOS 
18                                     POINT LOAD STRENGTH                                                NOS 
19                                     DEFORMABILITY TEST                                                  NOS    

Above are the laboratory test to be conducted as per requirement . The detail of conducting field test and laboratory test can be acquired from any test book on soil investigation. We will not discuss the same here. However i will try to provide you IS code number to relate the above test for further working knowledge and also what we derive from Geo technical investigation and Topographical Survey will be our objective.

IS 2720                                : Guideline of test for Soils.

IS 1892                                : Suitable mechanical rigs for boring.

IS 2131 & 2131                   : Sampling procedures and SPT ( standard Penetration Test)

IS 4078                                : Specification of core boxes to keep samples ( rocks)

IS 4968 ( part III)                 : Static Cone Penetration Test

IS 4434                                : Apparatus for Vane Shear Test

IS 1892-1979                       : Electrical Resistivity Test ( Appendix B clause 3.2)

IS 2720 (Part -V)                  : Attenberg Test 

IS 2720 (Part-III)                   : Specific Gravity

IS 2720 ( Part-10)                  : Unconfined compressive test

IS 2911 ( Part-III)                   : Free Swelling test.

Above list of IS codes are informative but not exhaustive there may be some other codes which I have missed . I request readers of the blog from India or abroad may do value addition.


( to be continued.)  


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