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To get undrained strength you should use either UU Tx or Unconfined Compression Test, not from CU Tx. Undrained strength obtained from CU Tx will be stronger than those obtained from UU Tx and Unconfined Comp Test, as on CU Tx test, the soil specimens are consolidated first before being sheared...

See an article in ASCE Geotechnical and Geoenvironmental Engineering Journal,Vol 125,No 8, Aug. 1999,pp 665 - 672, titled "Computing Top-Beam Effects in Retaining Walls" by Giovanni B. Ferelli et al. The article considers not only transverse load, but also torsional moment distribution along the...

Unless the clay is highly overconsolidated, undrained strength will govern the bearing capacity of the bridge foundation.

Prestressed concrete spun piles are precast. They are centrifugal casted result in high density concrete (fc'= 50 MPa). Spun piles are competitive in price and their quality are tightly controlled. Available pile dimensions are as follows: Diameter(mm): 350 400 450 500 600...

RFreund, If you have LPile, you can easily calculate the required embedment and wall inner forces (See the thread by jalthi "Tangent/Secant/Drilled Shaft Wall Modelling in LPile", in this forum). 8' wall is relatively a short wall, and it should be designed as cantilever wall

RFreund, Yes,steel rebar go trough the timber facing wall, extending into the ground, making an angle of 10 - 20 deg to horizontal plane. If the ground is not too hard, you can use backhoe to push rebars into the ground. Frictional resistance of nails can be calculated as driven piles/bored...

I suggest to use timber facing wall and nails of steel rebar, instead of timber deadmen.

If there is no surrounding building which is sensitive to settlement, you can adopt cantilever secant piles. Otherwise, I suggest to use rakers with top end at -1m.

Distribution of bond stress along anchor bond length depends on the ratio of ground modulus Eg to anchor modulus Ea. The smaller the ratio Ea/Eg (means anchor embedded in hard soils), the greater the stress concentration at the top end of anchor bond length. The above also implies that uniform...

Jalthi, I believe that you can use your model to analyze drilled shaft wall in LPile. Height of wall = distance from top of pile to ground surface, and the remaining length of pile as embedded portion of the wall. But, remember that p-y curves for a continuous wall is weaker than those of a...

Negative skin friction will develop if the compressible soil settling more than the pile settlement. Neutral plane will be located slightly below the rock surface, but for practical purpose, it cab be assumed at the rock surface. I normally check equilibrium in vertical direction taking into...

The most popular elastic method is Chang's method. This method uses linear subgrade modulus. Up to now, Japanese use this method to determine lateral capacity of pile corresponding to certain lateral deflection at pile head, say 1/4 ". You can find this method in most foundation text books...

Baztien, You will get phi >0 if during shesr there is water flow from one part to another part within the soil specimen or from soil specimen to the porous stone. In other word, you will get phi=0 if the soil specimen is fully saturated and the test apparatus is totally water tight

BigH, I agree that certain meter of extention of gravel beyond the tank edge can replace the ring wall. I believe the extension is not only for distributing the stress induced by the tank in such that it meets the original soil bearing pressure, but also to provide confinement to the stressed...

Large tanks normally founded on gravel layer above competent ground surface (you may need to remove the upper soft soil,and replace it with gravel, if necessary). Ring wall is required in order to provide confinement to the gravel, in such that the gravel can support the tank bearing pressure.

Optimum design capacity of ground anchor is about 600 to 800 kN. I suggest you to follow BS 8081: British Standard Code of Practice for Ground Anchorages. The code describes in detail about ground anchor design, installation, and testing. This code request for acceptance test upto 125% of the...

Iam sure sheetpile is not appropriate for such deep excavation. You can use either soldier piles (if ground water is deep) or secant piles / diaphragm wall (if ground water is high). For supporting the wall you can either use concrete slabs with kingpost (top-down construction method) or...

Thanks to pelelo and SoilRocks for the input. I agree with SoilRock that allowable lateral deflection is not related to pile diameter. What I normally do is to calculate the lateral force corresponding to lateral deflection of 1/4 to 1/2 inch. This lateral force is the allowable force, and I do...

Hello, I need a reference on any international building code which specify the allowable pile lateral deflection against base shear, for highrise buildings. Any input, suggestion will be appreciated

ngangey, Please look at Bowles Chapter 4.16 q allow rock = (qult(RQD)^2)/SF where qult = ult bearing pressure calculated by Terzaghi's equation Allowable bearing pressure mostly taken as 1/3 UCS for high RQD and 1/10 UCS for small RQD.