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Simple instrument method for test of internal stress of soil mass under cyclic loading

A stress test and soil technology, applied in settlement deformation test, simple instrument for stress test in soil under cyclic load, deformation modulus test field, can solve problems such as not causing scholars and so on

Active Publication Date: 2015-12-23
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the phenomenon of dynamic stress accumulation in soil has not attracted the attention of scholars.

Method used

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  • Simple instrument method for test of internal stress of soil mass under cyclic loading
  • Simple instrument method for test of internal stress of soil mass under cyclic loading
  • Simple instrument method for test of internal stress of soil mass under cyclic loading

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] 1. According to the needs of the experiment, prepare a remolded soil sample with a certain moisture content. The soil samples prepared for each group of tests should be greater than 8kg.

[0023] 2. Connect the compacting cylinder to the base and place it on the rigid foundation stably. Install the casing, apply a layer of lubricating oil evenly on the inner wall of the compaction cylinder, weigh a certain amount of sample, pour it into the compaction cylinder, and fill in layers. First, a 40mm soil sample was filled, and a pore water pressure sensor was placed horizontally in the center; the pore water pressure sensor was surrounded by saturated artificial filter material to ensure the accuracy of pore water pressure measurement. Then fill in a 40mm soil sample, and place an earth pressure sensor horizontally in the center; evenly spread 1.5cm thick fine sand on the upper and lower surfaces of the pressure box to ensure that the earth pressure box is evenly stressed. ...

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Abstract

The invention relates to a soil dynamic characteristic test technique for geotechnical engineering and especially relates to a simple instrument and a method for test of an internal stress of a soil mass under cyclic loading. A large quantity of researches and reports record that the roadbed soil under the cyclic loading is suffered from dynamic stress accumulation, but the academics does not pay attention to the phenomenon. The simple instrument can be mainly used for measuring the response conditions of the internal stress in the soil on factors such as different cyclic loading magnitudes, loading waveforms, loading frequencies and soil compaction rate, and acquiring the parameters, such as settlement curve, dynamic elastic modulus, total deformation modulus, static elastic modulus, of the soil mass under the cyclic loading effect. The method provided by the invention belongs to an innovative technology which is simple in laboratory test and convenient in soil dynamic characteristic acquisition; with the help of a lever pressure meter, the instrument can realize 10-times load output and can save instrument consumable materials and power sources; a computer system can be utilized to realize the automatic control on the instrument control and the data collection.

Description

technical field [0001] The invention relates to a soil dynamic characteristic test technology in geotechnical engineering, in particular to a simple instrument and method for testing internal stress of soil under cyclic load. The invention can also be used for the settlement deformation test and the deformation modulus test. The invention belongs to an innovative technology with simple indoor test and convenient acquisition of soil dynamic characteristics. Background technique [0002] The loads on foundations such as highways, railways, and airstrips are long-term repeated dynamic loads, and the mechanical behavior of soil under dynamic loads is fundamentally different from that under static loads. Many subgrade soils fail under cyclic loading far less than their static strength. Under repeated loading, the permanent deformation of the base and foundation will accelerate the deformation of the upper pavement structure, which will cause road disasters and traffic safety pr...

Claims

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Application Information

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IPC IPC(8): G01N3/38
Inventor 陈浩昆汤连生孙银磊张龙舰罗珍贵
Owner SUN YAT SEN UNIV
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