Test method for simulating anti-pulling bearing capacity of slip casting enlarged base pile
A test method, the technology of expanded bottom pile, applied in the test of foundation structure, sheet pile wall, building, etc.
Inactive Publication Date: 2017-01-04
TONGJI UNIV
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Problems solved by technology
[0005] The purpose of the present invention is to propose a test method aimed at the problem to be solved urgently in the study of the bearing capacity of the new type of grouting formed bottom expansion pile
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Embodiment １
[0033] 1. Test plan
[0034] This test is carried out to simulate the indoor model uplift bearing capacity test of a new type of grouting-formed expanded bottom pile. At the same time, the ratio of the diameter of the enlarged head to the diameter of the pile (referred to as the ratio of the diameter of the head) and the ratio of the length and diameter of the enlarged head (referred to as the ratio of length to diameter) are investigated. ) and other parameters on the bearing characteristics of grouted bottom expansion piles. Based on this, we can understand the law of load transfer during the shearing process, the distribution law and variation characteristics of earth pressure near the enlarged head, and initially explore the bearing mechanism of the grouted expanded bottom pile. At the same time, the uplift test of the expanded bottom pile under different normal pressure conditions was carried out to investigate the performance characteristics of the enlarged head end resi...
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The present invention relates to a test method for simulating anti-pulling bearing capacity of a slip casting enlarged base pile. Actual situations are simulated by means of a simulation test method through the use of a scheme of equivalently transforming a complex slip casting process into simpler diameter enlarging such as base enlarging. An indoor pile-soil model tester is used to carrying out anti-pulling test simulation of an enlarged base pile to obtain a relationship between pull and displacement, thereby obtaining the mechanical property anti-pulling bearing capacity of the slip casting enlarged base pile. The test method for simulating the anti-pulling bearing capacity of a slip casting enlarged base pile comprises the following steps: 1, fabricating a model pile and a calibrated soil pressure box; 2, burying the model pile and the soil pressure box; 3, connecting a loading device; and 4, carrying out an anti-pulling loading test. Compared with the prior art, the test method for simulating the anti-pulling bearing capacity of a slip casting enlarged base pile is capable of effectively testing the anti-pulling bearing capacity property of a novel slip casting enlarged base pile and the mechanical properties of soil around the enlarged base of the pile body, and is simple and easy to carry out, and economical and reliable.
Description
technical field [0001] The invention belongs to the field of foundation engineering, especially the foundation engineering construction field in coastal soft soil areas. It specifically designs a test method for simulating the anti-tear bearing capacity of grouting expanded bottom piles. The invention is simple, easy to implement, economical and reliable. Background technique [0002] With the development of social economy and the acceleration of urbanization process, the utilization of underground space has become a new development direction. But in my country's coastal soft soil areas, due to the high groundwater level, the anti-floating problem of large-scale underground buildings has become the focus of underground engineering circles. Setting uplift piles is a common method to solve the anti-floating problem of underground engineering, and has been widely used for a long time. The new type of grouting forming bottom expansion pile borrows the anti-lift mechanism and gr...
Claims
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Login to View More IPC IPC(8): E02D33/00E02D5/44
CPCE02D5/44E02D33/00E02D2600/10
Inventor 钱建固周敏明李诗远黄茂松
Owner TONGJI UNIV