试验员考试题库《2》（Test questions bank 2）.docVIP

试验员考试题库《2》（Test questions bank 2） 1. please discuss subgrade compaction degree evaluation method. Calculate compaction degree representative value K: When K is larger than K0, and the single point compaction degree is greater than or equal to the specified value of Ki total reduction of 2 percentage points, the evaluation section of the degree of compaction can be set out; when K is larger than K0 and single point compaction all greater than or equal to a predetermined value, the measured value is lower than the prescribed value minus points of 2 percentage points, according to the percentage of the total number of check point value calculation. When the compaction degree of KK0 or a single point is less than the prescribed extreme value, the evaluation grade of Ki is not qualified and the grade is zero. The construction period of the embankment is short time, and the degree of compaction is small enough to meet the requirements, and the actual sample number is not less than 6. 1., 2., please discuss the main process of bearing plate method to determine subgrade resilience modulus. 1) preparation before test (1) select representative measuring points according to the needs. The measuring points shall be located on the horizontal soil base with uniform soil and no debris; (2) carefully smooth the foundation surface, sprinkle dry clean fine sand, fill the soil base concave, and avoid formation of sand layer; (3) place the load bearing plate and correct it with a horizontal bar, so that the loading plate is in a horizontal state; (4) place the test car on the measuring point so that the middle of the stiffening girder is aligned with the center of the bearing plate; (5) put a jack on the load plate; (6) placed deflectometer, bearing bearing plate column measuring point two deflectometer are respectively arranged on the dial gauge to zero or other suitable initial position. 2) field testing (1) start loading with Jack, pre press 0.05MPa, steady voltage 1min, then unload