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Undrained load test device and method for fixed-confined rock-socketed piles

A technology of load test and rock-socketed piles, which can be applied in the test of foundation structure, construction, foundation structure engineering, etc., and can solve problems such as failure to consider the influence of pile end bearing capacity

Active Publication Date: 2017-08-08
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing tests fail to consider the impact of pile tip pore pressure changes on pile tip bearing capacity

Method used

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  • Undrained load test device and method for fixed-confined rock-socketed piles
  • Undrained load test device and method for fixed-confined rock-socketed piles
  • Undrained load test device and method for fixed-confined rock-socketed piles

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Experimental program
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Effect test

Embodiment Construction

[0064] Below in conjunction with accompanying drawing and embodiment this device is described in detail:

[0065] 1. Overall

[0066] Such as figure 1 , 2 , 3, 4, the device includes model pile 1, upper cover plate 2, pressure chamber 3, lower cover plate 4, upper sealing ring 5, lower sealing ring 6, screw rod 7, PVC-U pipe 8, sealing nut 9, Cement slurry 10 and rock sample 11;

[0067] Hole pressure sensor 1-1 is buried in the bottom of model pile 1, filter copper plug 1-2 is set at the bottom of hole pressure sensor 1-1, lead wire 1-4 of hole pressure sensor 1-1 is connected from inner hole 1-3 lead in;

[0068] The upper cover plate 2 is provided with a central guide pipe 2-1, a grouting exhaust hole 2-2, a perforation 2-3 and a sealing ring 2-4;

[0069] A threaded hole 4-1 is provided on the lower cover plate 4;

[0070] Its location and connection relationship are:

[0071] From bottom to top, the lower cover plate 4, the pressure chamber 3 and the upper cover pl...

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Abstract

The invention discloses a non-drainage load test device and method of fixed side confinement socketed piles and relates to the technology of rock mass mechanics socketed piles. The device is of a body structure formed by sequentially connecting a lower cover plate, a pressure chamber and an upper cover plate from bottom to top. A rock sample is placed into the pressure chamber. A PVC-U pipe is embedded into a drilled hole of a rock sample. A model pile is vertically inserted into the PVC-U pipe through a center guiding pipe. A sealing nut is screwed into a grouting exhaust hole. A screw rod penetrates through a through hole. The screw rod and the nut are screwed so that the screw rod is screwed into a threaded hole in the lower cover plate. The grouting exhaust hole is opened through screwing, and cement paste is poured. After the cement paste is set and hardened, the design strength is reached, the upper cover plate is opened, and the device is placed into water to achieve vacuumization saturation; after the sample is saturated, the device is placed into a loading system for a load test. The device can simulate end supporting characteristics of the socketed piles in rock, and hole pressure and bearing capacity changing rules are obtained when the pile tips are damaged. The device reaches unified standards, repeated industrial copying can be achieved, and the device is applicable to pouring and testing of various rocketed piles.

Description

technical field [0001] The invention relates to rock mechanics rock-socketed pile technology, in particular to an undrained load test device and method for fixed-limited rock-socketed piles. Background technique [0002] The pile whose tip is embedded in the rock mass is called a rock-socketed pile, and the difference in the characteristics of the rock-socketed pile embedded in the rock mass with different characteristics is caused by the difference in the characteristics of the rock mass. In order to simulate the stress and failure modes of rock-socketed piles, researchers at home and abroad have carried out a series of load tests and equal-scale indoor model tests on rock-socketed piles of equal size. The load test of equal-sized rock-socketed piles can obtain the bearing capacity data of the pile body well, but the test period is long and the field uncertainty is large. Therefore, the indoor model test can make up for the above defects. [0003] At present, the model te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D33/00
CPCE02D33/00E02D2600/10
Inventor 朱长歧刘海峰吴文娟王星翁贻令袁征朱初初秦月
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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