100+ Free Registered Civil Engineer — Road Engineering (China) Practice Questions

Highway Route Design & Alignment

Covers highway administrative and technical classification (Expressway, Class I to Class IV), design speed selection, horizontal alignment minimum curve radii $R_{min} = \frac{V^2}{127(i_{max} + f)}$, limiting vs general minimum radii, clothoid transition curve parameters ($A^2 = R L_s$), rate of change of centrifugal acceleration ($p$), superelevation runoff ($p_i$) and carriageway widening, maximum longitudinal grade and grade length limits, crest/sag vertical curve radii and length, stopping sight distance ($S_t = v t_1 + \frac{v^2}{2 g \phi}$), passing sight distance, horizontal clearing width, and 3D spatial alignment coordination principles (JTG D20-2017).

Subgrade Engineering & Slope Stability

Encompasses subgrade design flood frequency, subgrade compaction degree ($K$), heavy compaction test standards, California Bearing Ratio (CBR) minimum thresholds for roadbed strata, resilient modulus ($E_0$) and design deflection, embankment and cutting side slope ratios, slope stability calculation (Bishop simplified method and Swedish circle method), gravity, cantilever, and reinforced earth retaining wall design (sliding stability $K_c \ge 1.3$, overturning stability $K_0 \ge 1.5$), surface and subsurface drainage ditches, blind drains, and soft soil foundation improvement (CFG piles, cement deep mixing, plastic drainage plates, geosynthetic reinforcement, surcharge preloading) (JTG D30-2015).

Asphalt Pavement Design & Materials

Focuses on Mechanistic-Empirical asphalt pavement design (JTG D50-2017), equivalent single axle load conversion for the BZZ-100 standard axle load ($100\text{ kN}$), cumulative equivalent standard axle loads ($N_e$), multi-layer elastic continuum mechanics, design indices (asphalt bottom tensile fatigue strain, semi-rigid base bottom tensile stress, subgrade top compressive strain, surface rutting depth), asphalt mixture design (SMA, AC, Superpave, OGFC), Marshall and Superpave gyratory compaction metrics (VV, VMA, VFA, dynamic stability), PG asphalt binder classification, semi-rigid bases (cement-stabilized macadam), and functional coatings (prime, tack, and seal coats).

Cement Concrete Pavement Design

Addresses cement concrete pavement design (JTG D40-2011), 28-day flexural-tensile strength criteria ($f_r \ge 5.0\text{ MPa}$ for Expressway/Class I), cumulative traffic load fatigue stress ($\sigma_{pr}$) and thermal warping stress ($\sigma_{tr}$), joint layout and structural detailing (transverse contraction dummy joints with debonded dowel bars, full-depth expansion joints, longitudinal joints with tie bars), continuously reinforced concrete pavement (CRCP) longitudinal reinforcement ratio ($0.6\%–0.8\%$), and joint sealant performance.

Intersections & Grade-Separated Interchanges

Covers at-grade intersection channelization, conflict point elimination, auxiliary left/right turn deceleration and storage lane dimensioning, roundabout weaving sections, interchange typology (Diamond, Trumpet, Cloverleaf, Directional/Semi-directional), interchange ramp design speeds and minimum loop radii ($R \ge 50–60\text{ m}$), ramp superelevation and longitudinal gradients, speed-change lane transitions (parallel vs taper types), and weaving section operational analysis (JTG D20-2017).

Highway Traffic Engineering & Roadside Facilities

Focuses on roadside crash safety barriers (containment levels B, A, SB, SA, SS, HB, HA, W-beam guardrails vs rigid concrete barriers, impact energy), traffic signs and pavement markings (retroreflectivity classes, color coding, GB 5768 / JTG D81), highway roadway lighting (luminance $L_{avg}$, overall uniformity $U_0$, longitudinal uniformity $U_l$), and road tunnel illumination transition curves and jet-fan longitudinal ventilation design (JTG/T D70).