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  1. 1967pradyot

    Inference from Pile Integrity Test

    In one of our projects we have 1000mm dia bore cast-in-situ pile having a length of around 28.0m, resting in general on silty sand stratum. We have conducted some pile integrity tests and observed that some results are not usual. Following are our observations: 1) In some cases toe reflection...
  2. 1967pradyot

    Pile Dynamic Load Test

    I have lot of questions. First of all, I would like to know how to interprete the data obtained from pile dynamic load test for drilled shaft (high strain). How easily CAPWAP analysis can be done without software programme? Any references or web sites? Whether we can rely on dynamic load test...
  3. 1967pradyot

    Monolithic river bridge

    I have a problem in hand for which I wish to hear a solution from our experts. The structure is a monolithic river bridge. The foundation proposed is 1.5m bored cast-in-situ pile of around 30.0m deep. The sub-soil in general consists of alternate layer of sand and clay.The top layer is...
  4. 1967pradyot

    Arching Effect in Sand

    Hi In case of determination of pile capacity in cohesionless soil generally it is considered that overburden increases linearly upto a depth of 15-20D (D being the pile diameter). Beyond which it's become constant. It is established from laboratory and field tests that this is happened due to...
  5. 1967pradyot

    Why 95% Compaction

    Hi Why for any compaction of soil, it is stated that 95% of Modified Proctor or Standard Proctor dry density is to be obtained ? If we specify 85% or 90% and do obtain the required strength, whether it is OK? I want to know what exactly the justification of specifying that specfic ( generally...
  6. 1967pradyot

    Whether lateral load test can be allowed prior to vertical load test

    Load test (vertical & lateral) is to be carried out on same pile. Contractor wants to do the lateral load test first and then after a month will carry out vertical load test on the same pile. Please suggest me whether this will provide a correct picture on vertical compression capacity since due...
  7. 1967pradyot

    Causing failure prior to actual construction of Embankment

    An embankment of 3.0m height is to be built on a thick (10m from ground level) marine clay layer whose N=0.It is failing in stability (deep-seated), bearing capacity and naturally the settlement is also abnormally high - so a combination of ground improvements are required. I am thinking to...
  8. 1967pradyot

    Negative Skin Friction for Abutment Pile

    Generally for a calculation of pile capacity which may be affected by negative drag down, we do not consider the positive skin friction of those soft layer which will undergo settlement. But there is a case which is explained below, I am little bit confused how to account the negative skin...
  9. 1967pradyot

    Effect of Vibration in Dense sand

    Dear friends I would like to know the effect of vibrohammer for the following while boring through alluvial deposit during construction of bored-cast-in-situ pile 1) On dense sand having SPT value more than 40, underlying a stiff clay? 2) On high slump concrete having a slump of 150mm - 200mm...

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