Mechanical Behavior of Broken Stone Fills under Dynamic Consolidation

2012 ◽  
Vol 446-449 ◽  
pp. 1696-1702
Author(s):  
Zheng Guo Gao ◽  
Yu Long Du ◽  
Xiao Bo Huang ◽  
Xin Huang
Keyword(s):  
Numerical Simulation ◽  
Significant Relationship ◽  
Dynamic Compaction ◽  
Reinforcement Effect ◽  
In Situ Test ◽  
Response Characteristics ◽  
Dynamic Consolidation ◽  
Dynamic Response Characteristics ◽  
Better Than

This paper studies the dynamic response characteristics of broken stone fills. Numerical simulation and in-situ test of the acceleration and settlement of a high fill under dynamic consolidation are carried out. The result shows that increasing compact energy and the compact numbers can improve the reinforcement effect. There is no significant relationship between the dynamic compaction number reaching the stable settlement and compact energy. When the compact energy is the same, compaction with a heavier hammer is better than compaction with a lighter hammer.

scholarly journals Study on Compaction Effect and Process of Reclaimed Soil of Nonmetallic Mines in Xinjiang, China

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Kaikai Wang ◽  
Zizhao Zhang ◽  
Guobin Tang ◽  
Xiaodong Tan ◽  
Qianli Lv ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Land Reclamation ◽  
Simulation Method ◽  
Test Method ◽  
Soil Thickness ◽  
In Situ Test ◽  
Factors Affecting ◽  
Reclaimed Soil ◽  
Different Thickness

Reclaimed soil is the key substrate for land reclamation and ecological restoration in the mine areas. The change of the density of reclaimed soil of the nonmetallic mines in Xinjiang during the land reclamation process was studied in this paper. Firstly, the in situ test method of static load was used to simulate the compaction of reclaimed soil with different thickness of overlying soil by different compaction times of mines reclamation machinery, and field in situ test compaction data were obtained. Then, the numerical simulation method was used to simulate the variation process of displacement and porosity at different depths for different thickness of the reclaimed soil under different compaction conditions. The numerical simulation and the in situ test results verified each other to acquire the compaction process and results of reclaimed soil under different compaction. The results showed that the numerical simulation results were consistent with the in situ test. The reclaimed soil thickness and compaction times were crucial factors affecting the compaction effect of the soil. The difference between the three times compaction and the uncompacted soil was obvious, and the effect of single compaction was weakened with the increase of compaction times. Under the same compaction action, the thicker the soil was, the less obvious the compaction effect would be. In the process of reclamation, the compaction effect of the surface part (at the depth of 10 cm) was visible, and the amount of compression and springback was larger. The research results can provide a reference to the land reclamation of nonmetallic mines in Xinjiang, China.

Mitigation of liquefaction hazard by dynamic compaction — a random field perspective

2019 ◽  
Vol 56 (12) ◽  
pp. 1803-1815 ◽  
Author(s):  
Mengfen Shen ◽  
C. Hsein Juang ◽  
Qiushi Chen
Keyword(s):  
Random Field ◽  
Dynamic Compaction ◽  
Loose Sand ◽  
In Situ Test ◽  
Liquefaction Hazard ◽  
Before And After ◽  
Project Site ◽  
Field Perspective

This paper presents the findings of a case study to quantitatively assess the effect of dynamic compaction (DC) on mitigating liquefaction hazards from a random field perspective. DC is known to increase the density and strength of loose sand deposits, leading to a decrease in liquefaction potentials. Thus, by comparing the liquefaction potentials before and after DC at a given site, the effectiveness of DC in mitigating liquefaction hazards can be quantified. In practice, however, a direct one-to-one comparison is challenging due to limited availability of in situ test data and the fact that the number and location of these data before and after DC are typically different. To overcome these challenges, a random field-based approach is proposed in this study to visualize and quantitatively evaluate the effectiveness of DC across the entire project site. This approach is proven effective in assessing the effects of DC and is validated with liquefaction observations from the 1999 Chi-Chi earthquake.

Contrastive Studies of the Testing Method for the Bearing Capacity and Deformation Modulus of Dynamic Consolidation Backfill Foundation

2012 ◽  
Vol 446-449 ◽  
pp. 1606-1614
Author(s):  
Yue Gui ◽  
Hui Tao ◽  
Pei Ning Zhu ◽  
Hua Hai Yang ◽  
Tong Fa Deng
Keyword(s):  
Bearing Capacity ◽  
Deformation Modulus ◽  
Reference Value ◽  
Residual Soils ◽  
In Situ Test ◽  
Power Construction ◽  
Geological Conditions ◽  
Dynamic Consolidation ◽  
Engineering Practices

The study collected a great deal of testing data, including the physical properties of soil before dynamic compaction and in-situ test and laboratory test data after dynamic consolidation, from twenty-eight engineering practices about dynamic consolidation granite residual soils(GRS) backfill foundation in power construction in Guangdong province over the past fifteen years. The backfill were classified into three types according to the fraction of soil, the corresponding foundations were classified into three types too. Base on the plate loading testing (PLT), the suitability of testing the bearing capacity and deformation modulus of dynamic Consolidation backfill foundation, by dynamic penetrating testing (DPT), standard penetrating testing (SPT) and laboratory soil testing (LST), were evaluated. The statistic relationships between SPT, DPT blow count and the bearing capacity, deformation modulus of dynamic consolidation backfill foundation were also generalized; as well as the factors influent the testing results were analyzed. And the accuracy of adopting two common region specifications to determine the bearing capacity and deformation modulus were analyzes. This article has some reference value on ground treatment detection of dynamic consolidation backfill foundation with similar engineering geological conditions.

Reserch of Horizontal Dynamic Stress Distribution on Dynamic Consolidation of Discarded Iron Slag

2011 ◽  
Vol 250-253 ◽  
pp. 2959-2964
Author(s):  
Xiu Guang Song ◽  
Zhi Gang Dou ◽  
Kai Yao ◽  
Yang Yang
Keyword(s):  
Numerical Simulation ◽  
Dynamic Stress ◽  
Simulation Analysis ◽  
Dynamic Compaction ◽  
Experimental Program ◽  
Practical Application ◽  
Iron Slag ◽  
Dynamic Consolidation ◽  
Finite Element Numerical Simulation ◽  
Dynamic Stress Distribution

Dynamic consolidation has been widely used in many engineering fields. But in the use of discarded iron slag filled embankment, because the discarded iron slag is naturally piled up, multi-size particle mixture and backfilling height is relatively high, the effect of simple dynamic compaction is not obvious. This paper, combined with engineering examples, through the dynamic consolidation test, describes the experimental program, arrangement and spacing of tamping point, and matters need to be taken care in construction. It also explains the horizontal effects in consolidation by detection data analysis of waste iron slag roadbed. In this paper, we have established finite element numerical simulation analysis of dynamic consolidation by using FLAC3D. It is available in roadbed practical application and can be reference in similar projects of dynamic consolidation.

Study on the Effective Reinforcement Depth of Dynamic Consolidation

2011 ◽  
Vol 90-93 ◽  
pp. 1295-1298
Author(s):  
Xiu Guang Song ◽  
Kai Yao ◽  
Qing Dong Wu ◽  
Ji Shan Liu
Keyword(s):  
Field Testing ◽  
Simulation Method ◽  
Affecting Factors ◽  
In Situ Test ◽  
Main Design ◽  
Testing Method ◽  
Dynamic Consolidation ◽  
Effective Reinforcement ◽  
Formula Method

The effective reinforcement depth was the main design basis of dynamic consolidation. The concept and affecting factors of the effective reinforcement depth were analyzed in the paper. The evaluating standards and determining methods were also summarized. The effective reinforcement depth could be determined from the field test and the in-situ test index. Three kinds of methods could be used to determine the effective reinforcement depth: field testing method, numerical simulation method and formula method.

scholarly journals Numerical Simulation of Dynamic Response Characteristics of Cutting Coal and Rock by a Roller Coal Cutter

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Kesong Fan ◽  
Yutong Feng ◽  
Ruoyang Kong ◽  
Hua Wei ◽  
Wenlong Jiao ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Numerical Experiments ◽  
Simulation Software ◽  
Dynamic Responses ◽  
Average Speed ◽  
Response Characteristics ◽  
Whole Process ◽  
Different Types ◽  
Finite Element Numerical Simulation ◽  
Dynamic Response Characteristics

Currently, the identification technology of rock-coal medium is not reliable and practical, so we cannot judge the cutting state of coal-winning machine in real time. Different dynamic responses over different medium types of rock-coal can indirectly reflect the physical and mechanical parameters of rock-coal. In this study, we establish the 3-D numerical model of cutting the rock and coal by the finite element numerical simulation software in which we obtain the whole process of numerical simulation of the roller cutting coal, mudstone, and sandstone, where different dynamic responses counterpart different types of rock and coal by means of numerical experiments. The results show that when the drum keeps the average speed of cutting coal and medium forward, the instantaneous speed which is close to the average speed will have a small jump. The average speed and the torque in the cutting process can be considered as good indices to evaluate the rock and coal types. The torque from high to low is as follows: sandstone, mudstone, and coal. The average speed from high to low is as follows: coal, mudstone, and sandstone. If the portion of rock is more, the torque is higher and the average speed is lower during cutting the roof foot. This research is helpful for identifying rock-coal medium types by using related instrument to record the dynamic responses of rock-coal medium types.

scholarly journals Comparative In-situ Test and Numerical Simulation on Underreamed Ground Anchor

2020 ◽  
Vol 780 ◽  
pp. 032006
Author(s):  
Gang Guo ◽  
Zizhou Xue ◽  
Xiaochen Hu ◽  
Guang Zhong ◽  
Zhong Liu
Keyword(s):  
Numerical Simulation ◽  
In Situ Test ◽  
Ground Anchor
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