A Comprehensive Detection Method for Assessing Dynamic Compaction Effect on Granular Soil Foundation

Obtained stress distribution of hammer bottom according to the analysis of horizontal and vertical red sandstone fill dry density of the hammer bottom after dynamic compaction; affirmed the stress distribution situation of the hammer bottom through comparative analysis of the test results by laboratory and field monitoring.

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Numerical Study of the Dynamic Compaction Process considering the Phenomenon of Particle Breakage

Advances in Civil Engineering ◽

10.1155/2018/1838370 ◽

2018 ◽

Vol 2018 ◽

pp. 1-10 ◽

Cited By ~ 2

Author(s):

Xi Li ◽

Jing Li ◽

Xinyan Ma ◽

Jidong Teng ◽

Sheng Zhang

Keyword(s):

Numerical Study ◽

High Energy ◽

Particle Breakage ◽

Dynamic Compaction ◽

Coarse Grained ◽

Impact Stress ◽

Logarithmic Curve ◽

Before And After ◽

Soil Foundation ◽

Overlapping Method

Dynamic compaction (DC) is commonly used to strengthen the coarse grained soil foundation, where particle breakage of coarse soils is unavoidable under high-energy impacts. In this paper, a novel method of modeling DC progress was developed, which can realize particle breakage by impact stress. A particle failure criterion of critical stress is first employed. The “population balance” between particles before and after crushing is guaranteed by the overlapping method. The performance of the DC model is successfully validated against literature data. A series of DC tests were then carried out. The effect of particle breakage on key parameters of DC including crater depth and impact stress was discussed. Besides, it is observed that the relationship between breakage amount and tamping times can be expressed by a logarithmic curve. The present method will contribute to a better understanding of DC and benefit further research on the macro-micro mechanism of DC.

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Hybrid Numerical Investigation on Soil-Hammer Interaction during Dynamic Compaction

Advances in Civil Engineering ◽

10.1155/2019/4563134 ◽

2019 ◽

Vol 2019 ◽

pp. 1-11 ◽

Cited By ~ 1

Author(s):

Jian Wang ◽

Yinghui Cui ◽

Qimin Li

Keyword(s):

Interaction Process ◽

Dynamic Compaction ◽

Coarse Grained ◽

Lateral Extrusion ◽

Penetration Ability ◽

Maximum Penetration ◽

Soil Foundation ◽

Physical Phenomena ◽

The Impact ◽

Coarse Grained Soil

To investigate the mechanism of hammer-soil interaction under the action of dynamic compaction (DC) on a coarse-grained soil foundation, based on the theory of projectile penetration, the continuous-discrete coupling method is used to simulate the hammer-soil interaction process with different hammer shapes and different particle radii. The physical phenomena and mechanical parameters presented by the hammers and soil particles are quantitatively analyzed. The results show that the penetrating ability of the hammer is proportional to its lateral extrusion shearing ability and inversely proportional to its vertical extrusion capacity. The convex-bottomed hammer has the maximum penetration and lateral extrusion capability, the flat-bottomed hammer has the smallest penetration ability and the lateral extrusion capacity, and the concave-bottomed hammer has a penetration and lateral extrusion ability between those of the convex- and flat-bottomed hammers. The impact strength and vertical disturbance of the flat-bottomed hammer are the strongest, followed by the concave-bottomed hammer and the convex-bottomed hammer. In addition, it is found that the smaller the particle size of the coarse-grained soil is, the greater the depth of the crater formed and the smaller the contact force and the influence range of vertical disturbance. These research results reveal the interaction mechanisms of different hammer types and coarse-grained soil, which is expected to provide reference and guidance for the design and construction of coarse-grained soil foundations enhanced by DC.

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Field Test and Numerical Simulation of Dynamic Compaction of High Embankment Filled with Soil-Rock

Advances in Civil Engineering ◽

10.1155/2019/6040793 ◽

2019 ◽

Vol 2019 ◽

pp. 1-9 ◽

Cited By ~ 1

Author(s):

Lu Zhang ◽

Guangqing Yang ◽

Dongliang Zhang ◽

Zhijie Wang ◽

Jing Jin

Keyword(s):

Stress Field ◽

Plastic Zone ◽

Field Test ◽

Displacement Field ◽

Single Point ◽

Energy Levels ◽

Field Tests ◽

Optimal Number ◽

Dynamic Compaction ◽

Granular Soil

In view of the high filling height and large amount of soil and rock in the high-filled embankment, the variation law of the displacement field, stress field, and plastic zone of embankment body reinforced by dynamic compaction with different energy levels and the optimal compaction energy were analyzed by means of numerical simulations and field tests. Taking the embankment section of the Ping-Zan highway as an example, the construction scheme of dynamic compaction was designed, and the optimum tamping times and effective dynamic compaction depth of the embankment filled with soil-rock were obtained through the field test. The study showed that the displacement field and the stress field are redistributed after applying single-point compaction, and the volume of the shear plastic zone increases. The optimal number of slams for high-filled granular soil is 7 times, and the effective depth of dynamic compaction is 4.5 m. The result corresponds with that by the field test, which indicates that dynamic compaction is reasonable and has a significant effect on the high embankment filled with granular soil.

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The Responses of Soft Ground Materials Subjected to Dynamic Loading

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.591-593.977 ◽

2012 ◽

Vol 591-593 ◽

pp. 977-981

Author(s):

Jun He ◽

Bing Bai ◽

Quan Fei Chen

Keyword(s):

Pore Pressure ◽

Dynamic Loading ◽

Soft Soil ◽

Soil Layer ◽

Ground Surface ◽

Vertical Displacement ◽

Dynamic Compaction ◽

Soft Ground ◽

Soil Foundation ◽

Soft Soil Foundation

The responses of saturated soft soil foundation under dynamic loading are analyzed using numerical method. The distributions of pore pressure in space are given, and the variations of pore pressure with time are also discussed. Besides, the distributions of vertical stresses and vertical displacement are also given. Studies show that during the period of dynamic loading, the pore pressure and stress in soil layer grows very fast, and also decreases rapidly in the unloading phase. With the increase of dynamic compaction time, the locations of the maximum values gradually move down. Moreover, the pore pressure and stress gradually decreases with the increase of the distance away from hammer point. On the other hand, the tamping pit in ground surface under dynamic loading has a larger settlement, and furthermore decreases with the increase of depth.

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Theory of distribution of stresses in granular soil foundation

Journal of Terramechanics ◽

10.1016/0022-4898(64)90089-8 ◽

1964 ◽

Vol 1 (2) ◽

pp. 95

Keyword(s):

Granular Soil ◽

Soil Foundation ◽

Distribution Of Stresses

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The reinforcement effects of deep soft soil foundation with high degree of saturation under dynamic compaction

Advances in Mechanical Engineering ◽

10.1177/1687814018782633 ◽

2018 ◽

Vol 10 (6) ◽

pp. 168781401878263 ◽

Cited By ~ 2

Author(s):

Jihong Wei ◽

Yan Men ◽

Feng Zhu ◽

Huilin Le ◽

Haotian Fan

Keyword(s):

Soft Soil ◽

Dynamic Compaction ◽

Degree Of Saturation ◽

Reinforcement Effect ◽

Construction Time ◽

Soil Foundation ◽

Soft Soil Foundation ◽

High Degree ◽

Deep Soft Soil ◽

Compaction Method

The dynamic compaction method is effective to reinforce soft soil foundation with a low degree of saturation. However, deep soft soil foundation with high degree of saturation has some different characteristics. It has been widely considered that dynamic compaction method is unsuitable to improve the characters of deep soft soil foundation with high degree of saturation. In this article, we will show that the dynamic compaction method with vacuum well-point dewatering is effective to deep soft soil foundation with high degree of saturation reinforcement. In situ and laboratorial experiments are used to assess the reinforcement effect of the deep soft soil foundation with high degree of saturation. Our results show that the dynamic compaction method causes long dissipation time of pore water pressure, and the dynamic compaction method with vacuum well-point dewatering makes construction time of a project 25% shorter. The effective depth of deep soft soil foundation with high degree of saturation reinforcement using the two experimental methods can reach to 8.0 m. In comparison with the total settlement and layered settlement of the dynamic compaction method with vacuum well-point dewatering, the dynamic compaction method settlement is relatively smaller. For soils with depth of 4 m, the reinforcement effect of dynamic compaction method with vacuum well-point dewatering is obviously superior to dynamic compaction method. Based on these results, we suggest construction procedures for different reinforcement depth of soils and construction time.

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Research on Foundation Settlement of Oil Tank Project Based on Red Soil Foundation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.805-806.1524 ◽

2013 ◽

Vol 805-806 ◽

pp. 1524-1527

Author(s):

Shuo Chao Bao ◽

Qing Wang ◽

Yu Fei Ma ◽

Zi Jian Wang

Keyword(s):

Large Scale ◽

Surface Deformation ◽

Red Soil ◽

Dynamic Compaction ◽

Settlement Prediction ◽

Construction Scheme ◽

Oil Tank ◽

Soil Foundation ◽

Consolidation Degree ◽

Final Settlement

In order to provide the reference and basis to construction scheme and post-construction settlement prediction, this article based on a dynamic compacted red soil foundation of large-scale oil tank first-stage project of Guangxi, took settlement and conical surface deformation observation and used consolidation degree logarithm method to predict the final settlement of red soil foundation. According to the research, the effect of dynamic compaction was promising, and this method provided a reference to settlement prediction of red soil foundation.

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Study on the Treatment of Soft Soil Foundation Based on the Technology of Dynamic Compaction Replacement

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1065-1069.308 ◽

2014 ◽

Vol 1065-1069 ◽

pp. 308-311

Author(s):

Yue Guo Shen

Keyword(s):

Soft Soil ◽

Dynamic Compaction ◽

Construction Time ◽

Scheme Design ◽

Replacement Method ◽

Foundation Treatment ◽

Geological Conditions ◽

Selection Test ◽

Soil Foundation ◽

Soft Soil Foundation

Foundation treated with dynamic compaction replacement method can not only improve the foundation strength but also improve the drainage condition, which is advantageous to the consolidation of soft soil. Compared with the widely used immersed tube piles, its construction time is shorter and the benefit is obvious. With a warehouse project as an example, this paper expounds the scheme design, parameter selection, test, inspection, etc. in soft soil foundation treatment in muddy geological conditions taking dynamic compaction replacement method.

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