Classify the following soils by the AASHTO classification system. Give the group index for each soil. Sleve analysls- Percent flner Iquid Plasticlty Soll No. 10 No. 40 No. 200 llmlt Index 74 56 90 B...

For the hydraulic structure shown in Figure 8.19, draw a flow net for flow through the permeable layer and calculate the seepage loss in m3/day/m? 25 m 10 m 3.34 m 1.67 mE 20 m k 0.002 cm/sec 1.67 m...

Refer to Problem 8.5. Using the flow net drawn, calculate the hydraulic uplift force at the base of the hydraulic structure per meter length (measured along the axis of the structure)?

Refer to the flexible loaded rectangular area shown in Figure 10.46. Using Eq, (10.35), determine the vertical stress increase below the center of the loaded area at depths z = 2, 4, 6, 8, and 10 m....

A soil element beneath a pavement experiences principal stress rotations when the wheel load, W passes over it and moves away, as shown in Figure 10.47. In this case, the wheel load has passed over...

The coordinates of two points on the virgin compression curve are as follows: e ' (kN/m2) 1.22................108 0.97................225 Determine the void ratio that corresponds to a pressure of...

Undisturbed clay has a preconsolidation pressure of 100 kN / m2. A laboratory consolidation tests yield the following data: e ' (kN/m2) 0.92.................150 0.77.................300 Determine the...

For the consolidation test data given in Problem 11.11, a. Determine the coefficient of volume compressibility for the pressure range stated. b. If cv = 7 x 103 cm2/sec, determine k in cm/sec...

A 3.75 m clay layer in the field (drained on one side) is normally consolidated. When the pressure is increased from 50 kN / m2 to 150 kN / m2, the void ratio decreases from 0.9 to 0.75. The...

In a consolidated-drained triaxial test on clay, the specimen failed at a deviator stress of 124 kN / m2. If the effective stress friction angle is known to be 31, what was the effective confining...

Consider the clay sample in Problem 12.10. A consolidated-undrained triaxial test was conducted on the same clay with a chamber pressure of 103 k N/m2. The pore pressure at failure (ud)f = 33 kN/m2....

A consolidated-drained triaxial test was conducted on a normally consolidated clay with a chamber pressure, 3 = 172 kN / m2. The deviator stress at failure, (d)f = 227 kN/m2. Determine: a. The angle...

Following are the results of a laboratory consolidation test on a sample of undisturbed clay obtained from the field. Pressure, ' (kg/cm2) Final height of specimen (cm)...

If a consolidated-drained test is conducted on the clay specimen of Problem 12.17 with the same chamber-confining pressure of 150 k N/m2, what would be the deviator stress at failure?

Consider the specimen in Problem 12.1b. a. What are the principal stresses at failure? b. What is the inclination of the major principal plane with the horizontal? In problem 12.1b For a normal...

Undisturbed samples from a normally consolidated clay layer were collected during a field exploration program. Drained triaxial tests showed that the effective friction angle ' = 28. The unconfined...

Results of two consolidated-drained triaxial tests on a clayey soil are as follows: Using the failure envelope equation given in Example 12.10 (q' = m + p'tanα), determine the following...

A 10-m-thick normally consolidated clay layer is shown in Figure 12.57. The plasticity index of the clay is 23. Using Skempton's equation (12.35), estimate the Groundwater table Dry sand Clay Rock

Consider the clay soil in Problem 12.5. If a drained triaxial test is conducted on the same soil with a chamber confining pressure of 208 k N/m2, what would be the deviator stress at failure?

For the triaxial test on the clay specimen in Problem 12.6, a. What is the inclination of the failure plane with the major principal plane? b. Determine the normal and shear stress on a plane...

The relationship between the relative density, Dr, and the angle of friction, ', of a sand can be given as ' = 28 + 0.18Dr (Dr in %). A drained triaxial test was conducted on the same sand with a...

For a normally consolidated clay specimen, the results of a drained triaxial test are as follows: Chamber-confining pressure = 125 kN/m2 Deviator stress at failure = 175 kN/m2 Determine the soil...

Figure 13.10 shows a frictionless wall with a sloping granular backfill. Given: H = 4 m, α = 10°, Ï' = 33°, and γ = 19 kN/m3. a. Determine the magnitude of...

For the data given in Problem 13.17, determine the Rankine passive force, Pp, per unit length of the wall, and its location and direction. In problem 13.17 a. Determine the magnitude of active...

Redo Problem 13.19, assuming that a surcharge pressure of 11 kN/m2 is applied on top of the backfill. In Problem 13.19 a. Make the necessary calculation and draw the variation of Rankine's active...

A 10-m-high retaining wall with a vertical back face has a c' - ' soil for backfill material. Properties of the backfill material are as follows: = 19.1 k N/m3, c' = 35.9 k N/m2, and ' = 28....

Consider the retaining wall shown in Figure 13.38. The height of the wall is 9.75 m, and the unit weight of the sand backfill is 18.7 k N/m3. Using Coulomb's equation, calculate the active force, Pa,...

Referring to Figure 13.39, determine Coulomb's active force, Pa, per unit length of the wall for the following cases. Use Culmann's graphic construction procedure. a. H = 4.57 m, = 85, n = 1, H1 =...

Determine the minimum factor of safety of a slope with the following parameters: H = 12.2 m, ( = 18.43, ( = 18.4 kN/m3, (' = 20, c' = 23 kN/m2, and ru = 0.5. Use Bishop and Morgenstern's method?

How is the atomic number of an atom determined?

When four hydrogen nuclei, each composed of one proton, join to make one helium nucleus of two protons and two neutrons (as in Problem 2.13 above), the mass of the helium nucleus is calculated to be...

A major principle is illustrated by the rock cycle in Fig. 2.6, although it may not be readily apparent. Think about it, and then see if the answer does indeed make sense.

The three main types of volcanoes are illustrated in cross-section in Fig. 3.5. Note scales. Name each type.

Explain what happens as a mudstone becomes a schist during metamorphism [Figs. 6.1(a), 6.1(b), 6.1(c), and 6.2].

Name and define the three major classes of mineral resources

Why is it more difficult to find mineral resources today than it was in the first half of the twentieth century?

What relationships between accumulation and ablation, as in Fig. 10.1, will cause a glacier to advance or retreat?

Based on the previous problem, formulate a statement relating grain size, erosion, and deposition.

What is the difference between saying that a duck has webbed feet because it needs them to swim and saying that a duck is able to swim because it has webbed feet?

The gas constant R has the value 2.87 x 106 cm2 /s2 K for dry air, when pressure is in mb. Using the ideal gas law (p = (RT) find the density of dry air at 25C with a pressure of 1050 mb. Find the...

Clear Lake has a surface area of 708,000 m2 (70.8 ha). For a given month the lake has an inflow of 1.5m3/s and an outflow of 1.25m3/s. A +1.0 -m storage change or increase in lake level was recorded....

Using Excel spreadsheet programs, develop the S-curve for the given 3-hr UH, and then develop the 2-hr UH from the 3-hr UH. Time (hr) U (cfs) Time (hr) U (cfs) 0 75 180 275 280 210 6 7 89 1011 130 60...

Develop storm hydrographs from UHs of subareas 1 and 2 shown in figure P2-18 for the given rainfall and infiltration Wooded Meadows Meadows Fig P2-18 (hr)(in./hr) (in./hr) 0.5 0.4 0.2 0.2 0.2 0.9...

Assume the watershed in Example 2-5 has gone through extensive commercial and industrial growth on the wooded area. Now 50% of the formerly wooded areas have become urbanized, so of that portion, 40%...

The total annual runoff for a small watershed was determined to be approximately normal with a mean of 360 mm and a variance of 2900 mm2. Determine the probability that the total runoff from the...

Assume that the Siltez River data are normally distributed. Find the following. (a) Peak flow of the 100-yr flood (b) Peak flow of the 50-yr flood (c) Probability that a flood will be less than or...

Land use and population density data are given for several cities in the table on the following page. Estimate the percent imperviousness for each city using two methods: (1) Imperviousness as a...

Consider a circular price of diameter I m and a trapezoidal channel of maximum depth I m. The trapezoidal channel has a bottom width of I m and side slopes (vertical/horizontal) of 0.25. a) For a...

Three geologic formations overlie one another with the characteristics listed below. A constant velocity vertical flow field exists across the three formations. The hydraulic is 75 ft the top of the...

Two welfare located 100 m apart in a confined aquifer with a transmissivity T = 2 ( 10 -4 m2/s and storativity S = 7 ( 10 -5.One well to the west is pumped at a rate of 6.6 m7hr and the other to the...

A soil sample 6 in. in diameter and 1 ft long is placed in a fading head permeameter. The falling- head tube diameter is 1 in. and the initial head is 6 in. The head falls 1 in. over a 2-hr period....

The moisture content of a soil sample is 17% and the dry unit weight is 16.51 kN/m3. If Gs = 2.69, what is the degree of saturation?

For a given soil, w = 18.2%, Gs = 2.67, and S = 80%. Determine: a. Moist unit weight in kN/m3 b. Volume occupied by water

Classify the following soil using the U.S. Department of Agriculture textural classification chart. Particle-slze distribution (%) Soll SandSIlt Clay 20 20 45 50 70 35 15 15 40 20 35 15

A 5-m-high retaining wall with a vertical back face retains a homogeneous saturated soft clay. The saturated unit weight of the clay is 21 kN/m3. Laboratory tests showed that the undrained shear...