Method for measuring lower limit depth of self-weight collapse of large-thickness loess

A measurement method and a large-thickness technology, which are applied in the field of foundation soil survey, soil material testing, foundation structure engineering, etc., can solve the problems of long test period, complex test conditions, and inappropriate use in large quantities, and achieve easy popularization and use, data accurate effect

Inactive Publication Date: 2020-06-02
CHANGAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

If the lower limit depth of self-weight subsidence is determined according to the field test pit immersion test, the test result is reliable, but the test period is long, the cost is high, and the test conditions are complicated, so it is not suitable to be widely used in projects.

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  • Method for measuring lower limit depth of self-weight collapse of large-thickness loess
  • Method for measuring lower limit depth of self-weight collapse of large-thickness loess
  • Method for measuring lower limit depth of self-weight collapse of large-thickness loess

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Embodiment Construction

[0038] Such as Figure 1 to Figure 4 Shown, the assay method of a kind of large thickness loess self-weight collapsibility lower limit depth of the present invention comprises the following steps:

[0039] Step 1. Excavating exploratory wells: Excavating exploratory wells at the position to be excavated according to the empirical value or original test value of the lower limit depth of loess self-weight wet subsidence in the area, and the excavation depth of the exploratory wells is H=H 0 +ε, where H 0 is the empirical value or original test value of the lower limit depth of loess self-weight wet subsidence in the area, and ε is the excavation depth allowance of exploratory wells;

[0040] In this embodiment, the excavation depth margin ε of the exploratory well in step 1 is 2m-3m.

[0041] Step 2. Determine the sampling depth and take soil samples at the corresponding sampling depth: according to the formula h i =a 0 +iΔ, determine the i-th sampling depth h i , where a ...

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Abstract

The invention discloses a method for measuring the lower limit depth of self-weight collapse of large-thickness loess. The method comprises the following steps: 1, excavating an exploratory well; 2, determining a sampling depth and taking a soil sample at the corresponding sampling depth; 3, sampling the ith undisturbed soil sample by a cutting ring; 4, carrying out a consolidation test on the first cutting ring sample; 5, testing the self-weight collapsibility coefficient of the second cutting ring sample; 6, repeating the step 3 to the step 5 for multiple times until the consolidation test and the self-weight collapsibility coefficient test of the I undisturbed soil samples are completed; and 7, obtaining the loess self-weight collapse lower limit depth of the region. The method starts from the angle of total volume change of loess pores; aiming at large-thickness self-weight collapsible loess, an indoor test is adopted to determine the loess self-weight collapsible lower limit depth; a new thought and a new method are provided for determination of the loess self-weight collapsible lower limit depth, and the method has high precision, and is economical and practical and convenient to use compared with a field test pit immersion test.

Description

technical field [0001] The invention belongs to the technical field of measuring the lower limit depth of self-weight collapsibility of large-thickness loess, and in particular relates to a method for measuring the lower limit depth of self-weight collapsibility of large-thickness loess. Background technique [0002] Collapsible loess is widely distributed in the world, and most of them have self-weight collapsibility. When carrying out engineering construction in self-weight collapsible loess areas, the collapsibility must be dealt with, and the depth of treatment is mainly based on self-weight collapsibility. The lower limit depth is determined. According to my country's "Building Standards for Collapsible Loess Areas" GB50025-2018, the judgment of self-weight collapsibility and the lower limit depth of self-weight collapsibility can be determined by field test pit immersion test, or indoor loess collapsibility test by self-weight collapsibility coefficient. The self-weigh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G01N1/08E02D1/02E02D1/04
CPCE02D1/022E02D1/027E02D1/04G01N1/08G01N33/24
Inventor 井彦林黄文峰贾卓龙张志权武超毅胡永华李洁茹张旭彬黄月赵庄
Owner CHANGAN UNIV
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