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Method for defining and calculating compaction and settlement ratio so as to determine optimal compaction times

A technology of ramming-sink ratio and ramming number, applied in soil protection, construction, infrastructure engineering, etc., can solve problems such as waste of ramming energy and ineffective ramming of foundations, and achieve accurate calculation results.

Inactive Publication Date: 2014-10-01
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is not to say that the more the number of ramming, the better. If the number of ramming exceeds the optimal number, the foundation cannot be rammed effectively, resulting in waste of ramming energy. Therefore, a method that can accurately and effectively determine the optimal number of ramming is urgently needed

Method used

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  • Method for defining and calculating compaction and settlement ratio so as to determine optimal compaction times
  • Method for defining and calculating compaction and settlement ratio so as to determine optimal compaction times
  • Method for defining and calculating compaction and settlement ratio so as to determine optimal compaction times

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Embodiment

[0057]a) Take a rammer with a steel material diameter of 32cm as the research object and conduct the test. The mass of the rammer is 70kg, the drop distance is 1.4m, and the energy level is 980N.m. The foundation material is filled with loess-like silt with a water content near the optimal water content of 14%. The filling thickness is 0.75m, the filling density is 0.85, the plane size is 4m×3m, and the test is rammed for 14 times. Landing gear and automatic decoupling are simple devices. In order to obtain the acceleration time history curve of the rammer during the impact process, a piezoelectric acceleration sensor, model DH131E, is installed on the top of the rammer, and a DH5956 dynamic strain gauge is used to collect dynamic acceleration signals. The depth of the rammed pit is measured with a level gauge to obtain the rammed settlement b of each blow. After the test, the collected acceleration curve of the tamper and the tamping weight per strike were studied. In this ...

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Abstract

The invention provides a method for defining and calculating the compaction and settlement ratio so as to determine optimal compaction times, belongs to the technical field of civil engineering foundation treatment, particularly relates to the rammer efficiency conversion aspect and aims at solving the technical problem and providing a method for defining the compaction and settlement ratio, using a rammer as a research object, calculating the compaction and settlement ratio so as to determine the optimal compaction times. Optical energy distribution selection and energy consumption reduction has important significance in the actual engineering. The technical scheme is that the compaction and settlement ratio (shown in description) is defined and calculated through a compaction test of the rammer, and the optimal compaction times are determined by drawing a compaction times-compaction and settlement ratio curve chart, wherein the b represents measured single-beat compaction and settlement amount, and the S represents rammer stroke number value calculated through integration. The ratio of each-beat actually-measured compaction and settlement amount b to a rammer stroke number value calculated value is defined as the compaction and settlement ratio lambda, a compaction times-compaction and settlement ratio curve is obtained, the optimal compaction times are analyzed and determined, and calculation is accurate, convenient and economic.

Description

technical field [0001] The invention defines and calculates the tamping-sink ratio to determine the optimal tamping number, belongs to the technical field of civil engineering foundation treatment, and specifically relates to the efficiency transformation of a tamping hammer. Background technique [0002] The dynamic compaction method is a method of freely dropping a weight of tens of tons (generally 8-40t) from a height of tens of meters (generally 6-40m) to compact and strongly compact the foundation soil. The current situation is that the practice of dynamic compaction is developing rapidly, but there are still many ambiguities in the mechanism and design theory of dynamic compaction. The theory is far behind the practice. Issues such as energy distribution and construction optimization of dynamic compaction have always attracted attention. [0003] At present, conventional methods for determining the number of ramming include the empirical method, the method of determini...

Claims

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Application Information

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IPC IPC(8): E02D3/046
Inventor 韩云山段伟秦伟华吴晗董彦莉耿少波郑亮张洪萍韩志宏
Owner ZHONGBEI UNIV
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