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The Method of Determining the Compaction Degree of Embankment Filling after Dynamic Compaction According to the Ramping Settlement

A technology of compaction and tamping, which is applied in the test of basic structure, construction, basic structure engineering, etc., can solve the problems of long time consumption, high cost, and large difference in compaction degree, so as to avoid repeated construction and improve The effect of detection efficiency and reduction of construction cost

Active Publication Date: 2017-12-22
CHINA 19TH METALLURGICAL CORP
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Problems solved by technology

[0003] The detection of the effect of dynamic compaction after dynamic compaction is an important part of dynamic compaction construction. At present, the main methods used at home and abroad include dynamic sounding, load test, wave velocity test, and compaction detection. The conventional test method takes a long time. costly
At the same time, due to the large impact depth of dynamic compaction, the in-situ test can only give the reinforcement quality at a certain number of sampling points, and cannot evaluate the reinforcement effect within the entire impact range of dynamic compaction.
The detection of the degree of compaction after dynamic compaction is generally taken from the surface of the filled soil, which cannot reflect the change of the degree of compaction within the entire impact range of dynamic compaction. The compaction test is not very accurate due to the loosening of the fill surface after dynamic compaction

Method used

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  • The Method of Determining the Compaction Degree of Embankment Filling after Dynamic Compaction According to the Ramping Settlement
  • The Method of Determining the Compaction Degree of Embankment Filling after Dynamic Compaction According to the Ramping Settlement
  • The Method of Determining the Compaction Degree of Embankment Filling after Dynamic Compaction According to the Ramping Settlement

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Embodiment

[0043] refer to figure 1 , figure 2 as well as image 3The following describes the determination process of the average compaction degree in conjunction with a municipal engineering high embankment dynamic compaction site. The high embankment of a municipal project is 20m high, and the embankment fill is weathered mudstone, and the compaction degree of the embankment before reinforcement is 92%. The design of dynamic tamping reinforcement is that the tamping energy is 6000KN·m, the rammer weighs 30t, the drop distance is 20m, and the rammer diameter is 2.5m.

[0044] Combined with the specification, on-site Rayleigh wave test and finite element calculation, when the tamping energy is 6000KN m, the impact depth H of dynamic tamping is modified by the Menard formula: It is calculated that the impact depth H of the dynamic compaction is about 9m, and the diameter L of the impact range of the dynamic compaction is twice the diameter D of the rammer. Then the volume within th...

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Abstract

The invention discloses a method for determining the filling compaction degree of a dynamically-compacted embankment according to compaction subsidence. By adopting the method, the average compaction degree of the embankment can be rapidly acquired on site, and the reinforcing effect after dynamic compaction is then evaluated. The method comprises the steps that the reinforcing mode for dynamic compaction is simplified to be cylindrical; then an on-site embankment dynamic compaction influence depth H and the diameter L of a dynamic compaction influence range are determined; therefore the volume V of the dynamic compaction ramming influence is calculated; then a filling sample of the embankment before ramming is acquired, and the compaction degree of the on-site embankment before dynamic compaction is calculated; then the depth of a compaction pit and the diameter of a compaction rammer are detected on the on-site embankment after dynamic compaction, so that the volume of the compaction pit is calculated; and then the compaction degree is calculated according to the change of the volume of filling before and after ramming. By adopting the method for determining the filling compaction degree of the dynamically-compacted embankment according to the compaction subsidence, the detection efficiency for foundation dynamic compaction reinforcing quality is improved; the construction cost is lowered; the reinforcing effect of dynamic compaction can be evaluated in time; and repeated construction is avoided.

Description

technical field [0001] The invention relates to a method for evaluating the reinforcement effect of embankment reinforced by dynamic ramming, in particular to a method for determining the compaction degree of embankment filling soil after dynamic ramming according to the amount of ramming settlement. Background technique [0002] It is known that the high embankment has a large self-weight stress, a high stress level and a large settlement caused by the compression of the fill itself, and the settlement is common, especially the problem of uneven settlement of the embankment 2. It is a commonly used engineering treatment measure to eliminate the settlement of embankment 2 in advance by adopting dynamic compaction method for reinforcement treatment when building high embankment 2 . [0003] The detection of the effect of dynamic compaction after dynamic compaction is an important part of dynamic compaction construction. At present, the main methods used at home and abroad inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 陈虎侯振斌胡伟山张发平陈亚军李晓红李昕蕊代权宋雪梅
Owner CHINA 19TH METALLURGICAL CORP
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