Method for calculating loess unloading collapsibility

A calculation method and technology of collapsibility, which is applied in the field of calculation of loess unloading collapsibility, can solve the problems of large calculation value, high cost, ignoring the influence of unloading effect, etc., and achieve the effect of simple calculation process and reasonable calculation results

Pending Publication Date: 2021-06-15
XIAN TECHNOLOGICAL UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a calculation method of loess unloading collapsibility, to solve the problem that the cost of existing

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  • Method for calculating loess unloading collapsibility
  • Method for calculating loess unloading collapsibility
  • Method for calculating loess unloading collapsibility

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Embodiment Construction

[0040] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] The invention discloses a calculation method for loess unloading collapsibility, which consists of the following steps:

[0042] Step 1: Calculate and obtain the collapsibility completion ratio η that reflects the extent of loess collapsibility when unloading occurs 1 , calculate η 1 The formula is:

[0043]

[0044] In the formula: S 1 Before the unloading action occurs, the sample is at the pressure p 1 The amount of collapsibility completed under the action (mm); S is the sample under the pressure p 1 The total collapsibility under action (mm).

[0045] Calculate the unloading stress ratio K reflecting the vertical pressure reduction range when the unloading action occurs in the process of loess collapsibility. The formula for calculating K is:

[0046]

[0047] In the formula: p 1 is the initial pressure (kPa); Δp is t...

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Abstract

The invention discloses a method for calculating loess unloading collapsibility, which comprises the following steps of: 1, calculating to obtain a collapsibility completion ratio eta1 for reflecting the degree of completed collapsibility of loess when an unloading action occurs, and calculating to obtain an unloading stress ratio K for reflecting the vertical pressure reduction amplitude when the unloading action occurs in the loess collapsibility process, 2, calculating an unloading collapsibility coefficient deltaus by using the collapsibility completion ratio eta1 and an unloading stress ratio K, 3, calculating a loess modulus reduction coefficient Zu under an unloading condition through the unloading collapsibility coefficient deltaus, and 4, calculating loess unloading collapsibility according to the loess modulus reduction coefficient under the unloading condition. According to the method, a modulus reduction method under the unloading effect is utilized, the actual stress change condition in the collapsing process of the loess between the piles is fully considered, and the stress change in collapsing and sinking of the loess between the piles is made to conform to the actual working condition by drawing up modulus reduction coefficients Zu under different unloading conditions; the unloading collapsing effect is successfully introduced into inter-pile loess collapsing deformation calculation, the calculation process is simple, and the inter-pile loess collapsing deformation calculation result is reasonable.

Description

technical field [0001] The invention belongs to the field of calculation methods for loess unloading collapsibility, in particular to a calculation method for loess unloading collapsibility. Background technique [0002] Under the positive influence of the policy of co-constructing the "Silk Road Economic Belt", construction projects such as buildings, roads, municipal administration, bank slopes, and underground urban complexes in the loess area have flourished. Accidents such as building tilting, structural cracking, ground subsidence, and pavement damage are not uncommon. Due to the complexity of loess collapsibility, the existing loess collapsibility evaluation methods are not suitable for unloading and collapsing conditions, which specifically refer to the deformation process of loess collapsing such as test pits, pipe trenches, and soil between piles Conditions with associated unloading. Due to the lack of research on loess collapsibility evaluation under unloading a...

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Application Information

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IPC IPC(8): G06F30/13G06F30/20G06F119/14
CPCG06F30/13G06F30/20G06F2119/14
Inventor 金鑫王铁行
Owner XIAN TECHNOLOGICAL UNIV
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