| 摘要 |
FIELD: construction.SUBSTANCE: testing method of carrying capacity of pile consists in the creation of stepwise increasing load on the soil through the pile and die before the conditional stabilization at which the upset speed doesn't exceed the specified value, during time specified, depending on type of soil, in the simultaneous upset recording with control precision equal to 0.01 mm, and for each stage of loading - in the construction of graphs of upset change in time, having the exponential form with curved zone, characterizing the upset speed before the initiation of conditional stabilization, and with flat zone. Upset registration at each stage of loading is performed at regular time intervals, which are specified within the limits of 3-5 min. Schedule of upset change in time (exponential curve) is built by upset values, uniformly registered in each time interval. The interval with the registered upset speed equal to 0.05 mm/min, according to which the new criterion of conventional stabilization is set, is determined at the curved portion of exponent. Time prior to conventional stabilization is determined by the number of intervals at the curved area until the specified time interval. Time of observation over the upset speed not exceeding 0.05 mm/min, is determined by the number of time intervals at the remaining segment of the curved area of exponential curve before the initiation of the flat area. For different types of soils the specified number of observation intervals over the upset speed is maintained in the ratio L1: L2=1/T1:2/T2, where T1, L1 - interval time and number of intervals, respectively, during time of observation over upset speed during pile testing on the sandy and clayey soil from solid to low-plasticity consistency; T2, L2 - interval time and number of intervals, respectively, during observation over the upset speed when testing the pile on the clay soil from solid to low-plasticity consistency.EFFECT: reduction of time and cost of tests due to bringing the results of upset registration of pile to the actual state of soil of the respective type.2 cl, 2 ex, 5 dwg |
