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Large-scale vibration liquefaction test system and design method

A technology of vibration liquefaction and test design, applied in the field of civil engineering, can solve the problems of unformed design method, inability to guide large-scale vibration liquefaction test environment, artificial simulation, etc., and achieve low test economic cost, strong expandability, and accurate control Effect

Inactive Publication Date: 2017-10-20
宁波市交通建设工程试验检测中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the parameter design of this method for the multi-point differential explosion liquefaction test mainly depends on the inductive statistics of the existing test data and the empirical judgment formed in the process. A reliable design method and test system have not yet been formed, and it cannot guide large-scale Artificial simulation of vibration liquefaction test environment

Method used

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  • Large-scale vibration liquefaction test system and design method
  • Large-scale vibration liquefaction test system and design method
  • Large-scale vibration liquefaction test system and design method

Examples

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Embodiment 1

[0043] like figure 1 Shown, it is the flowchart of large-scale vibration liquefaction experiment design method of the present invention, and this design method comprises the following steps:

[0044] Stp1. Excavate a large test pit in the field, lay non-woven geotextiles on the pit wall to form a backfill area, and then fill the pit with sand and store water to saturate.

[0045] Stp2. Drilling a plurality of charge holes and pore water pressure sensor holes in the test pit, and arranging water-resistant explosives and pore water pressure sensors in the charge holes and pore water pressure sensor holes respectively.

[0046] Stp3. Adjust the charge and buried depth of water-resistant explosives to conduct multi-group single-point explosion liquefaction tests, use numerical models to analyze the effects of charge and burial depth on the degree and range of liquefaction, establish a single-point explosion liquefaction prediction formula, and obtain site closure Critical proport...

Embodiment 2

[0052] This embodiment includes the following steps on the basis of the foregoing embodiments:

[0053] Stp1. Excavate a large test pit in the field, lay non-woven geotextiles on the pit wall to form a backfill area, then backfill sand in the pit and store water to saturation, store water for 21 days, and determine the density of the site through the static penetration test. The backfill material of the present invention is controllable. The test pit is backfilled with fine sand by means of throwing and rolling by an excavator. The compactness of the site can be controlled by the backfill method, and other soil materials such as clay can be filled in the pit according to the test requirements. Filling conditions can more accurately grasp the law and characteristics of the actual soil liquefaction response.

[0054] Stp2. Drill a plurality of charge holes and pore water pressure sensor holes in the test pit, arrange water-resistant explosives and pore water pressure sensors in ...

Embodiment 3

[0066] to combine figure 2 As shown, it is a structural diagram of a large-scale vibration liquefaction test design system of the present invention, and the system includes a test pit 1, an explosion module and a data acquisition module. The test pit 1 is used for vibration liquefaction test, the pit wall of the test pit 1 is covered with non-woven geotextile 2, and the pit is backfilled with saturated sand. The explosion module is used to form a large-area liquefaction site through explosion, and the explosion module includes a plurality of water-resistant explosives 3 . The data collection module is used to collect vibration liquefaction test data, which is arranged in the test pit 1 .

[0067] The test pit 1 is provided with an annular charge distribution ring, and a plurality of charge holes are drilled on the charge distribution ring, and the water-resistant explosive 3 is arranged in the charge holes. The data acquisition device includes a pore water pressure sensor 4...

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Abstract

The invention discloses a large-scale vibration liquefaction test design method which comprises the following steps: Stp1, a large-scale test pit is excavated, filled back with sandy soil and then saturated; Stp2, a water-resistant explosive and a pore water pressure sensor are arranged in the test pit; Stp3, a plurality of groups of single point explosion liquefaction tests are performed, and a single point explosion liquefaction prediction formula is established; Stp4, multi cartridge bag trial explosion tests are performed, and a multi cartridge bag explosion liquefaction prediction formula is established; Stp5, according to the prediction formulas, vibration liquefaction test system prediction parameters are obtained; and Stp6, multi-point explosion liquefaction verification tests are performed, and large-area vibration liquefaction test system design parameters are determined. Large-area vibration liquefaction test environment can be artificially simulated, and multiple purposes of accurately grasp of actual soil liquefaction response rules and characteristics and expansion of catastrophe tests of a large structure in liquefaction environment and the like can be achieved. The invention also discloses a large-scale vibration liquefaction test system, which has the advantages of large test scale, low later test economic cost, wide adaptability and strong expansibility and the like.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a large-scale vibration liquefaction test system and a design method. Background technique [0002] In the past, when studying the dynamic response characteristics of soil and the stress or deformation of buildings (structures) under earthquake loads, indoor triaxial instruments, shaking tables or centrifuges were generally used. There are deficiencies in aspects such as edge effects and boundary effects, and the reliability of the results is directly related to the test equipment. In view of the unpredictability of the time and location of the earthquake, it is impossible to wait for the relevant experimental research to be carried out when the earthquake occurs. At the same time, considering the similarities between the explosion ground motion and the natural earthquake in many aspects, scholars at home and abroad have begun to try to use the explosion technology in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 干啸洪王维国方继伟谢玲儿顾俊钢朱建朝陈立平伍绍一
Owner 宁波市交通建设工程试验检测中心有限公司
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