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Field test and measurement method of strength characteristics of unsaturated soil

A field test and measurement method technology, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of unsaturated soil disturbance, suction fluctuation change, and affecting the suction of the bottom soil layer, etc., to achieve small construction area and disturbance small effect

Active Publication Date: 2019-05-24
HAINAN UNIVERSITY
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Problems solved by technology

[0003] The indoor test of the mechanical properties of unsaturated soil and the constitutive relationship of unsaturated soil adopts borehole sampling to carry out the test indoors, but the borehole sampling will cause disturbance to the unsaturated soil, and the produced sample will cause cracks to cause suction fluctuations and damage its inherent structural properties
Self-drilling techniques using flushing or compressed air are not suitable for unsaturated soil conditions because it causes changes in pore water pressure or pore air pressure, affecting the suction of the soil layer at the bottom of the hole (pore water pressure or pore air pressure)
Chinese Journal of Geotechnical Engineering (2006, Vol. 28, No. 2) "Study on the relationship between suction and strength in the dry-wet cycle process" article studied the effect of the dry-wet cycle process on the strength of unsaturated soils caused by changes in the water environment. However, the dry-wet cycle test is carried out under no load, which is inconsistent with the actual formation with a certain buried depth.

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  • Field test and measurement method of strength characteristics of unsaturated soil

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Embodiment Construction

[0029] see Figure 1-8 Shown:

[0030] A field test method for determining strength characteristics of unsaturated soil, comprising the following steps:

[0031] (1) In this method, two holes are set in the determination of the strength characteristics of unsaturated soil, one is the test hole A, and the other is the suction test hole B. According to the design depth, use a Luoyang shovel with a diameter of 150mm to dig the vertical test hole A at the exploration point to the design depth, use a Luoyang shovel with a diameter of 50mm to dig the vertical suction test hole B at a distance of 300mm from the test hole A, and the suction test hole B The depth of the test hole A is the same as that of the test hole A, respectively, and the bottom of the hole is flattened; the suction test hole B is at a position 300mm away from the test hole A. This position is in the area affected by the load and will not affect the entire load-displacement response. Effectively measure the sucti...

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Abstract

The invention relates to a field test and measurement method of strength characteristics of unsaturated soil, which comprises: digging a test hole A and a suction test hole B with a Luoyang shovel, setting a measuring device of strength characteristics of unsaturated soil above the test hole A, setting a tensiometer at the bottom of the suction test hole B, carrying out loading test in the test hole A, observing changes in the reading of the tensiometer in the suction test hole B, drawing a load-settlement curve, and carrying out other steps. Field test and measurement from the Luoyang shovel-formed holes to strength characteristics of unsaturated soil are achieved herein; the field test and measurement method and device to acquire strength characteristics of unsaturated soil through the loading test and the tensiometer measurement test are provided; the load-settlement curve under different suction levels is drawn through groups of unsaturated soil loading tests under different suction levels so that strength characteristic parameters of unsaturated soil are attained; therefore, strength of the unsaturated soil under any suction level is calculated.

Description

technical field [0001] The invention relates to a method for measuring the bearing properties of soil layers, in particular to a field test method for measuring the strength properties of unsaturated soil. Background technique [0002] Suction is the basis and core of the theoretical system of unsaturated soil mechanics, and it is the fundamental difference between unsaturated soil and saturated soil. Suction is of great significance in explaining the mechanical properties of unsaturated soil in geotechnical engineering problems. The design and construction of unsaturated foundations is guided by the control of settlement and deformation. Changes in the suction of unsaturated soils will cause uneven settlement or excessive settlement of the foundation, which has an important impact on the deformation and strength of unsaturated soils. The suction of unsaturated soil can be measured indoors and on site. It is mainly divided into matrix suction and seepage suction. According t...

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Application Information

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IPC IPC(8): G01N3/08
Inventor 张友良郑玉风崔洁莫思阳伍书重张亚军
Owner HAINAN UNIVERSITY
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