Questions tagged [soil]

Questions related to the use of soils in engineering, as a material, or as object of research. Some common uses in Civil engineering are as surface for water flow, for foundations, as part of pavement structure, as seepage medium, or as origin of loads over other structures. Other uses in agronomic engineering, or biology, are as medium for storage of water, cultivation, as an erosionable agent, as a souce of receiver of contaminants.

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27 views

Effect of area spring at slab on column

Say that a simple building is supported by 4 columns , the column sitting on base slab. I assigned some sort of area spring to the base slab. When the area spring assigned is higher, this cause the ...
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1answer
37 views

Force required to vertically pull a post out of ground with various soil types

I am trying to determine the force required to vertically lift a typical traffic sign post (round, square and/or channel) out of the ground based on typical soil types at standard installation below ...
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1answer
110 views

PE exam: situations in which two question choices are close to my final answer: how to pick one?

Consider this question: I solve this eventual question and my answer is 7.29667: Among the question choices are 7 x 7 ft and <...
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Is there a mode of failure criterion for a valid unconfined uniaxial compressive strength test for intact rock core specimens?

I have read the latest revision of the ASTM D7012 standard, which includes the test procedure for determining the unconfined uniaxial compressive strength of intact rock core specimens. There, I do ...
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1answer
36 views

Hydrostatic Pressure in Soil

In a saturated soil, why is the pore water pressure equal to hydrostatic pressure? Terzaghi's principle states that the effective stress between solid particles is equal to the total stress $t$ minus ...
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2answers
68 views

Why is the wet/dry boundary of ground not dangerous for foundations?

A building, such as a house, rests on a foundation. Beneath it is natural earth. When it rains, the ground around the foundation becomes wet. But the ground underneath the foundation does not. There ...
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1answer
57 views

Missing items in geotechnical reports [closed]

In your experience, what items that should be in geotechnical reports are sometimes missing, and what do you do in that case, can you provide example? Do we look at codes or make best guess and based ...
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2answers
79 views

Does Eurocode allow use of Robertson chart to determine soil type based on CPT results?

It seems that use of the Robertson charts (Robertson, P.K. [1990] " Soil Classification using the cone penetration test" Canadian Geotechnical Journal 27(1), 141-8) to classify soil type based on CPT ...
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0answers
28 views

What is the effect of ageing on preconsolidation pressure?

Preconsolidation pressure is the maximum effective vertical overburden stress that a particular soil sample has sustained in the past. How far in the past does the soil remember its loading/the ...
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1answer
76 views

3 x 1 stone under footing and sump crock

I am having a house built and the builder found organic soils during the excavation. They removed the soils and then filled the cavity with 1x3 stone (see picture). This is the corner where the sump ...
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1answer
65 views

Soil mechanics-Geotechnical engineering [closed]

Which is more economical to improve or change the soil that is used to build a structure? my answer is that it depends on each case, but I would like to get more information, or where to search about ...
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2answers
363 views

Is it possible to calculate Young's Modulus of Clay from load-controlled tests?

I'm trying to get the compressive strength (and Young's modulus) of a clay sample. The method I found is called 'Unconfined Compressive Strength of Cohesive Soil'. According to ASTM D2166M, I have ...
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What diameter of particles will result in a blocked borehole?

My mine is looking to install a 600 mm open borehole to drop particles up to 150 mm through. It's a 320m shaft to drop ballast down to save time compared to using the drift. When it gets blocked ...
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93 views

How would you calculate the force needed to rotate along the x axis vertical earth anchor in dirt?

I'm a high school student who hasn't had the pleasure of taking physics yet, so forgive me if the answer is obvious. The problem I have involves an earth anchor drilled vertically into the earth. I ...
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2answers
213 views

Liquid Limit of Soil through Atterberg Tests

My lab is evaluating the liquid, plastic, and shrinkage limits of some soil samples and we are following this video provided by the Missouri University of Science and Technology. The video indicates ...
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1answer
31 views

Is it possible to reuse or the oil recovered from a spill?

I don´t know if this is the rifght place to ask this question, but I would like to know if after the remediation of a soil contaminated with hydrocarbon you can reuse or even sell the oil recovered. ...
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427 views

Why is this construction site pouring gravel over a wire mesh, and then covering it with dirt?

My office is afforded a prime view of a construction project where the workers are currently covering the leveled ground in a wire mesh, raking gravel across the entire mesh, and then covering that ...
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1answer
426 views

Is possible for a silt soil to be compacted hard as a rock?

I had been told that a silt soil, when professionally compacted (from all the laboratory essays to the compaction with a vibratory roller), ends hard as a rock, and when hit with a metal bar it makes ...
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1answer
380 views

What is a safe soil load to avoid settlement?

For residential design, looking at IBC 2012 Table 1806.2 it seems a safe soil load to design for is 1500 psf if you want to save time and cost isn't yet an issue. (assuming you're not building on a ...
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2answers
4k views

What is the physical meaning of Cumulative Passing% in Grain Size distribution?

When preforming a grain size distribution on a sample of Soil using Mechanical Sieves (e.g. Sieve #4 and sieve #10 and sieve #40) one of the necessary calculation need for drawing the particle size ...
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1answer
2k views

Total lateral pressure from clay soil when hydrostatic pressure is also present

I'm stuck with how to work out the total pressure and centre of pressure in this example. At an outdoor boundary between two properties there is a stepped change in ground level of the clay soil. The ...
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0answers
245 views

How to derive Darcy's law only in the case of saturated soil without derived all cases?

How to derive Darcy's law only in the case of saturated soil in mathematical/theoretical way without having to derive all the cases? I can only find the generalized theoretical proof for all cased ...
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3answers
6k views

How does excess water makes soil compaction more difficult?

I understand how water content helps compaction, by being kind of a lubricant between the soil particles, that helps them slide into position. But I don´t really understand how it starts affecting ...
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1answer
69 views

What paint/spray on material should I use to insulate a metal pole?

I am not entirely sure if this is the correct forum to ask this question so please refer me on if there is a better arena. I am creating a small weather station and I wish to measure soil ...
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1answer
1k views

How to determine the lateral earth pressure in a double-walled cofferdam?

The design of a retaining wall commonly involves determining the lateral earth pressure using either Rankine theory or Coulomb theory. Both theories involve mobilising the shear resistance of a ...
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2answers
166 views

How are the structural properties of intentionally frozen soil determined?

Soil freezes naturally all of the time. It is at this point that dirt work usually stops. Occasionally soil is intentionally frozen to improve its structural properties. This process has been used ...
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1answer
2k views

What is the unbraced length of a pile in soil?

When analyzing a pile or drilled shaft as a beam-column, how do you determine the unbraced length of the portion that is in the ground? Typically, the braced points on a beam or column are well ...
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2answers
1k views

Soil swelling and mass/volume relationships

Given moisture content, Specific gravity of solids, initial volume, and weight. I'm asked to compute the moist unit weight, dry unit weight, and degree of saturation of this compacted soil. This is ...
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1answer
175 views

Settling of unevenly loaded storage tank

Suppose I have a concrete tank, round, vertical, diameter in the range 16m-24m. One half the floor is filled with gravel or concrete to a height of maybe 2 meters. When the tank is empty, that will ...