PE Civil Geotechnical Exam Prep

The PE Civil Geotechnical exam rewards engineers who can read a boring log, pick the right soil model, and carry a calculation through to a defensible answer. Most problems start with stress in the ground and end with a capacity, a settlement, or a factor of safety. STEM Tutor 360 offers one-on-one prep for this exam. We begin with a diagnostic, build a plan backward from your test date, and practice with the electronic reference material open so lookups feel routine.

Topics include site characterization and subsurface exploration, soil classification and index properties, laboratory and field testing, effective stress, shear strength, shallow and deep foundations, settlement and consolidation, earth retaining structures, slope stability, ground improvement, and seepage. Many people use only a few of these on the job, so we focus on the gaps. We also keep a short list of the sign and unit mistakes that cost points, such as forgetting buoyancy below the water table.

How we build your plan

• A timed diagnostic samples soil mechanics, foundations, retaining structures, slopes, and seepage.
• Weeks one and two rebuild the base: phase relationships, effective stress, and Mohr's circle for stress states.
• Next come the design topics, each with a hand-checked example before timed practice: bearing capacity, pile capacity, earth pressure, and slope factors of safety.
• Consolidation and flow nets get their own sessions, since both reward careful diagrams and consistent units.
• The final stage is mixed timed sets that jump between topics, then a full practice session in the electronic format.

A typical geotechnical problem, worked

A soil profile has 10 ft of sand above the water table, with a total unit weight of 115 pcf. Below it is clay with a saturated unit weight of 118 pcf. The water table is at 10 ft. Find the vertical effective stress at 20 ft depth. Use 62.4 pcf for water.

• Total stress at 20 ft: $115 \times 10 + 118 \times 10 = 1{,}150 + 1{,}180 = 2{,}330\ \text{psf}$.
• Pore water pressure at 20 ft: $62.4 \times 10 = 624\ \text{psf}$.
• Effective stress: $2{,}330 - 624 = 1{,}706\ \text{psf}$.
• Check using buoyant weight: $1{,}150 + (118 - 62.4) \times 10 = 1{,}150 + 556 = 1{,}706\ \text{psf}$. Both routes agree.
• Most settlement, bearing, and earth pressure problems start from this number, so it pays to make it automatic.

About the exam

Geotechnical is one of five computer-based PE Civil exams from NCEES; the others are Construction, Structural, Transportation, and Water Resources and Environmental. You work with the PE Civil Reference Handbook and the exam's design standards on screen, so practice looking things up electronically from the start.

The NCEES exam specification lists the standards, question count, timing, and topic weights for Geotechnical, and it can change, so read the current version before you plan. STEM Tutor 360 is independent and has no affiliation with NCEES or any standards publisher.