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Non-drainage load test device and method of fixed side confinement socketed piles

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

Active Publication Date: 2016-04-20
INST OF ROCK AND 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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  • Non-drainage load test device and method of fixed side confinement socketed piles
  • Non-drainage load test device and method of fixed side confinement socketed piles
  • Non-drainage load test device and method of fixed side confinement socketed piles

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Experimental program
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Effect test

Embodiment Construction

[0064] The following describes the device in detail with reference to the drawings and embodiments:

[0065] 1. Overall

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

[0067] The pore pressure sensor 1-1 is embedded in the bottom of the model pile 1, and the copper filter plug 1-2 is set at the bottom of the pore pressure sensor 1-1. The lead 1-4 of the pore pressure sensor 1-1 is from the 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 4, the pressure chamber 3 and the upper cover 2 are connected in sequenc...

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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-socketed pile technology in rock mass mechanics, in particular to an undrained load test device and method for fixed-confined rock-socketed piles. Background technique [0002] The pile with the end of the pile embedded in the rock mass is called the rock-socketed pile. The difference in the characteristics of the rock-socketed piles 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 force and failure modes of rock-socketed piles, domestic and foreign researchers have carried out a series of load tests on rock-socketed piles of equal size and equal-scale indoor model tests. The load test of rock-socketed piles of equal size can obtain the pile body bearing capacity data well, but the test period is long and the field uncertainty is large. Therefore, the use of indoor model tests can make up for the above shortcomings. [0003] At...

Claims

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Application Information

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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 AND SOIL MECHANICS - CHINESE ACAD OF SCI
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