Device for testing stress condition of pile group under asymmetric edge loads

Abstract

The invention discloses a device for testing the stress condition of a pile group under asymmetric edge loads. The device is characterized in that the device comprises a testing case, a loading case, model piles, a pore pressure meter, an acquisition instrument and a high definition camera, a layered soil body is arranged in the testing case, and the acquisition instrument and the high definition camera are arranged outside the testing case. The device for testing the stress condition of the pile group under the asymmetric edge loads is advantaged in that 1. the soil body is loaded by high pressure air, during the loading process, the load application value can be controlled easily, and the condition of asymmetric edge loads can be simulated easily; and 2. the high pressure air loading manner is configured in a way that air pressure is applied to the soil body through a rubber film, the soil body is contacted with the load flexibly, and the condition that heaped loads are applied to the surface of soft soil in actual engineering can be met.

Description

technical field [0001] The invention relates to a force measuring device for group piles under asymmetrical side load, which belongs to the technical field of force measurement. Background technique [0002] Under the action of negative frictional resistance, the pile foundation will increase the axial force of the pile body and increase the settlement, which will cause damage to the pile body and the upper structure in severe cases. At present, researchers in this field pay more attention to the negative frictional resistance of pile foundations under the action of uniformly distributed surcharge on the soil surface. In actual engineering, the piled load on the soil surface often exists in the form of side load. For example, the common abutment pile foundations in soft soil areas are subjected to asymmetrical side loads such as embankment surcharges, and pier pile foundations are subjected to rear yard surcharges. Compared with the uniform surcharge on the soil surface, w...

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Problems solved by technology

[0003] At present, there are few domestic and international studies on pile group stress testing under asymmetric side loads. In the existing tests, side load simulations use direct stacking and jack simulation loading. For model tests, it is often difficult to obtain a larger value for direct stacking. Side load value, although the jack loading method can apply a large load to the model soil, but the cumbersome reaction device brings trouble to the test, especially under asymmetrical side load, the jack loading needs to be installed on both sides of the reaction device , it is not easy to simulate such asymmetrical side loads in a small experimental box; moreover, the steel plate is mostly used as the force transmission medium for jack loading, and the contact between the rigid plate and the soil is obviously different from the flexible contact between the piled load and the soil layer in actual engineering

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