Shallow Foundation: Plate Load Test
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4 سال پیش
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plate load test is useful to estimate bearing capacity of soil on field.
The test procedure is given in IS:
1888–1982 (Revised). The procedure, in brief, is as follows:
(i) After excavating the pit of required size and levelling the base, the test plate is
seated over the ground. A little sand may be spread below the plate for even support. If ground water is encountered, it should be lowered slightly below the base by
means of pumping.
(ii) A seating pressure of 7.0 kN/m2 (70 g/cm2) is applied and released before actual
loading is commenced.
(iii) The first increment of load, say about one-tenth of the anticipated ultimate bearing
capacity, is applied. Settlements are recorded with the aid of the dial gauges after 1
min., 4 min., 10 min., 20 min., 40 min., and 60 min., and later on at hourly intervals
until the rate of settlement is less than 0.02 mm/hour, or at least for 24 hours.
(iv) The test is continued until a load of about 1 1
2 times the anticipated ultimate load is
applied. According to another school of thought, a settlement at which failure occurs
or at least 2.5 cms should be reached.
(v) From the results of the test, a plot should be made between pressure and settlement, which is usually referred to as the ‘‘load-settlement curve’’, rather loosely.
The bearing capacity is determined from this plot, which is dealt with in the next
subsection.
plate load test is useful to estimate bearing capacity of soil on field.
The test procedure is given in IS:
1888–1982 (Revised). The procedure, in brief, is as follows:
(i) After excavating the pit of required size and levelling the base, the test plate is
seated over the ground. A little sand may be spread below the plate for even support. If ground water is encountered, it should be lowered slightly below the base by
means of pumping.
(ii) A seating pressure of 7.0 kN/m2 (70 g/cm2) is applied and released before actual
loading is commenced.
(iii) The first increment of load, say about one-tenth of the anticipated ultimate bearing
capacity, is applied. Settlements are recorded with the aid of the dial gauges after 1
min., 4 min., 10 min., 20 min., 40 min., and 60 min., and later on at hourly intervals
until the rate of settlement is less than 0.02 mm/hour, or at least for 24 hours.
(iv) The test is continued until a load of about 1 1
2 times the anticipated ultimate load is
applied. According to another school of thought, a settlement at which failure occurs
or at least 2.5 cms should be reached.
(v) From the results of the test, a plot should be made between pressure and settlement, which is usually referred to as the ‘‘load-settlement curve’’, rather loosely.
The bearing capacity is determined from this plot, which is dealt with in the next
subsection.
4 سال پیش
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