PROJ00402

• Contract/PO #: C153517
• Contractor Name: Lone Cabin Ditch and Reservoir Company
• Contract Type: Loan
• Water District: 40
• County: Delta
• Bill Number: SB 87-15
• Loan Projects - Doc Type: Feasibility Study

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of the soil may be weakened soil strength and increased

pore pressure by increased moisture content or weathering

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and loosening of slope soils~

We performed several analyses of the proposed fill

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...1

slope.

Our analyses were ba$ed on the simplified Bishops

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method of slices, an infinite slope analysis, and a wedge

analysis.

The simplified Bishops method aSSumes that the

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slope soils will fail as a rotation on a circular arc.

In this method the mass of the soil is divided into vertical

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slices.

The forces acting on the slice are evaluated from

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the equilibrium of the slices;

that is, the forces that

tend to drive the slice downhill and the forces that tend to

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resist the movement of the slice.

The forces that tend to

drive the slice downhill are the gravitational forces

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acting on the slice and facto~s that tend to resist the move-

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rnent of the soils are the frictional and internal soil

strengths acting on the slice and along the plane of failure.

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The equilibrium of the entire mass is determined by summing

the driving and resisting forces acting on all slices.

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Our analyses also included a wedge analysis of the

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proposed fill assuming that the failure plane occurs along

the proposed fill and natural soil contact.

We also per-

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formed a varying thickness infinite slope analysis for the

proposed fill material and proposed slope.

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M85131GE

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1l.nmbert nnb g.ll.llocinte.ll

CONSULTING GEOTECHNICAL ENGINEERS AND
MATERIAL TESTING