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Method for pre-estimating post-construction settlement of composite road foundation by static load test

A composite foundation and static load technology, applied in the field of geotechnical engineering, can solve problems such as unpredictability of post-construction settlement

Active Publication Date: 2017-05-24
江苏路业建设有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a device and method for predicting the post-construction settlement of the road composite foundation static load test in view of the deficiency that the existing composite foundation plate load test cannot predict the post-construction settlement

Method used

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  • Method for pre-estimating post-construction settlement of composite road foundation by static load test
  • Method for pre-estimating post-construction settlement of composite road foundation by static load test
  • Method for pre-estimating post-construction settlement of composite road foundation by static load test

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Embodiment example

[0159] Existing cement-soil pile composite foundation, pile body diameter 0.5m, pile spacing 1.5m, square piles, pile length 12m, pile tip enters rock formation 2m, bulk density of soil between piles γ=18kN / m 3 , soil deformation modulus, specific gravity G s =2.7, the water content of soft soil is 40%, the initial void ratio e 1 =0.9, permeability coefficient k=8.6×10 -8 cm / s, compression factor α v =2.5×10 -4 kpa -1 , The embankment load is 120kpa, the soft soil layer is 10m thick, and the information of the plate load test predicts the settlement of the composite foundation after 20 years of operation.

[0160] Table 3 Test data of cement-soil mixing pile plate load test

[0161]

[0162] untie:

[0163] The secondary consolidation coefficient is calculated from the formula (1) and the measured data of the field plate load test

[0164]

[0165] The sub-consolidation settlement can be obtained from formulas (3) and (4):

[0166]

[0167] 20 years depends on...

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Abstract

The invention discloses a method for pre-estimating post-construction settlement of a composite road foundation by a static load test. The method comprises the steps: obtaining a value of the pile-soil stress ratio; conducting a multi-stage loading test to the maximum test load, and then judging stability; after stability judging, continuing a sustaining load delaying test; determining relevant parameters for pre-estimating the post-construction settlement by a laboratory test and engineering experience; according to test data including the pile-soil stress ratio, settlement parameters and the relevant parameters, predicting the secondary consolidation coefficient of soft soil, pre-estimating post-construction secondary consolidation settlement, and calculating post-construction primary consolidation settlement; converting a measured settlement value of a plate load test to an immediate settlement value of the actual working condition of the composite foundation, and integrally pre-estimating the total post-construction settlement of the composite foundation according to the immediate settlement value of the actual working condition, the primary consolidation settlement and the secondary consolidation settlement. The method develops a new static load test technology capable of pre-estimating the post-construction settlement of the composite foundation and provides a new idea for the further development and benefit exerting of the static load test technology for the composite foundation.

Description

technical field [0001] The invention relates to a device and method for predicting post-construction settlement in a road composite foundation static load test, and belongs to the technical field of geotechnical engineering. Background technique [0002] The current flat plate load test of subgrade composite foundation mainly refers to the "Technical Specifications for Building Foundation Treatment" (JGJ79-2012) and "Technical Specifications for Building Foundation Inspection" (JGJ340-2015) to complete the static load test task of composite foundations, and is used to evaluate the performance of composite foundations. However, the comprehensive information of direct test data such as settlement, load, and deformation curve characteristics contained in the test does not give full play to its application value. The settlement and deformation information is only used to assist in the identification of bearing capacity, which seriously restricts the effectiveness and effectivenes...

Claims

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Application Information

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IPC IPC(8): E02D1/02
CPCE02D1/022
Inventor 徐奋强洪宝宁何培玲张德恒刘鑫赵四汉单浩
Owner 江苏路业建设有限公司
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