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 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.

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.

scholarly journals In Situ Test Research on Friction Resistance of Self-Anchored Test Pile

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Chi Chen ◽  
Hailong Ma ◽  
Bilian Yang
Keyword(s):  
Transfer Process ◽  
Load Transfer ◽  
Test Method ◽  
Hyperbolic Function ◽  
Function Model ◽  
In Situ Test ◽  
Testing Method ◽  
Pile Testing ◽  
Test Pile

The traditional static load test method has been considered as the most direct and reliable method to determine the bearing capacity of single pile, but it has some disadvantages, such as inconvenient operation, laborious test, high cost, and being time-consuming. In this paper, a new type of pile testing method, self-anchored pile testing method, was proposed, and the in situ test was carried out for the first time. This method allows the upper and lower piles to provide force to each other and does not occupy other construction spaces. It had the advantages of simple operation and being economical and practical. Based on the Q-w curve, axial force distribution curve, and hyperbolic function model of load transfer, this paper studied the evolution law of friction of self-anchored test pile and the load transfer process of self-anchored test pile. The results show that the load transfer process of self-anchored pile-soil interface can be divided into three stages: elastic, elastic-plastic, and limit state. The friction of the upper and lower piles starts from the bottom of each pile and then gradually increases. The soil around the upper and lower piles gradually undergoes nonlinear deformation and shear failure, and the pile soil reaches the yield state. By analyzing the hyperbolic function model of load transfer, it shows that the hyperbolic function model can be better applied to the self-anchored test pile, which has reference value for the selection of the function model of self-anchored test pile in the future.

Testing Research of Aspect Ratio on Corrugated Box Compression Strength

2011 ◽  
Vol 48-49 ◽  
pp. 1213-1216 ◽  
Author(s):  
Zhuan Wei ◽  
Guang Jun Hua ◽  
De Jian Zhao
Keyword(s):  
Aspect Ratio ◽  
Compression Strength ◽  
Simulation Method ◽  
Strength Increase ◽  
Classical Formula ◽  
Forming Process ◽  
Testing Method ◽  
Corrugated Cardboard ◽  
Strength Formula ◽  
Formula Method

The aspect ratio is one of the important factors that impact the corrugated box compression strength. In this paper, the three most commonly method that can be used to obtain the corrugated boxes’ compression strength, namely testing method, classic formula method and computer simulation method were compared. Selecting some 0201 BC flute corrugated boxes as the object, on the condition that the cardboard materials, carton height and circumference of the corrugated box is at the same, the compression strength of corrugated boxes which aspect range from 1 to 3 were tested and calculated respectively by compression strength testing method and classical formula. The results show that when the aspect ratio changes from 1 to 3, the compression strength increase at first, and then decrease; the compression strength reach maximum when the aspect ratio at 1.6 or so. The results show that the classic formula calculation data are large deviate from the testing ones. Research shows that due to not fully take into account the influence of corrugated cardboard quality, box forming process, temperature and humidity and other factors, the currently classic compression strength formula are more conservative.

scholarly journals Studi Literatur Korelasi Hasil Uji Berdasarkan Uji Plate Bearing dan Uji Dynamic Cone Penetrometer

2020 ◽  
Vol 3 (4) ◽  
pp. 1157
Author(s):  
Steven Lius ◽  
Inda Sumarli ◽  
Ali Iskandar
Keyword(s):  
Soil Samples ◽  
Cone Penetrometer ◽  
Clayey Soils ◽  
In Situ Test ◽  
Subgrade Soils ◽  
Testing Method ◽  
Dynamic Cone Penetrometer ◽  
Subgrade Soil

The subgrade soils must be able to withstand the load that is transferred. The quality of the subgrade soil is important because if it is sturdy, the construction above it can also be sturdy as well. Therefore, in designing a construction, soil investigation, such as plate bearing test and dynamic cone penetrometer test, must be conducted. However, one method may be superior compared to others, that the author will analyze the correlation between them. Plate bearing test is an in-situ test used for determining the ultimate bearing capacity of soil by only applying pressure to it. Whereas, dynamic cone penetrometer test is a testing method to measure the thickness and strength of soil. In this research, the collected data will be analyzed and correlated. The result of correlation between ks and CBR from DCP test is the determinant coefficient value. The value for clayey soils is 0.6198 which means that the correlation value is strong. Meanwhile, for sandy soils, the values are 0.9841 and 0.9878 which means both of the correlation values are very strong. Furthermore, the correlation of Su values from both tests cannot be determined because the soil samples have not reached the fracture condition. Lapisan subgrade merupakan lapisan yang menahan seluruh beban di atasnya. Kualitas dari lapisan ini sangat penting, karena jika lapisan subgrade tersebut kokoh, maka konstruksi di atasnya juga akan kokoh. Oleh karena itu, dalam merencanakan sebuah konstruksi, penyelidikan tanah, seperti uji plate bearing dan uji dynamic cone penetrometer, di lokasi suatu bangunan yang akan dibangun itu sangat penting. Namun, setiap metode penyelidikan tanah tentunya memiliki kelebihan dan kekurangan masing-masing, sehingga penulis akan menganalisa korelasi antara kedua pengujian. Uji plate bearing merupakan metode pengujian untuk menentukan nilai daya dukung tanah dengan hanya memberikan tekanan pada tanah. Sedangkan, uji dynamic cone penetrometer merupakan metode pengujian untuk mengetahui nilai ketebalan dan kekuatan suatu lapisan tanah. Pada penelitian ini, data yang sudah dikumpulkan akan dianalisa dan dikorelasikan. Hasil korelasi antara nilai modulus reaksi tanah dasar dan CBR dari uji DCP untuk jenis tanah lempung menghasilkan koefisien determinan sebesar 0.6198 yang artinya nilai korelasi tersebut kuat. Sedangkan, untuk jenis tanah pasir, didapatkan koefisien determinan sebesar 0.9841 dan 0.9878 yang artinya nilai korelasi tersebut sangat kuat. Kemudian, untuk korelasi nilai kuat geser tanah dari masing-masing pengujian belum bisa dijelaskan karena sampel tanah yang digunakan belum mencapai kondisi fracture.

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.

Evaluation of Reinforcement Effects for Earth Cliff of Jiaohe Ancient City

2012 ◽  
Vol 594-597 ◽  
pp. 1054-1060
Author(s):  
Yu Cheng Shi ◽  
Ai Guo Wang ◽  
Ren Dong Qiu ◽  
Ming Qing Hu ◽  
Heng Zhi Wang ◽  
...  
Keyword(s):  
Field Testing ◽  
Test Method ◽  
In Situ Test ◽  
Composite Method ◽  
Ancient City ◽  
Three Fissures ◽  
Different Characteristics

The author adopted an in-situ test method of artificial arthquake survey to evaluate reinforcement effects of fissure grouting for earth cliff of Jiaohe ancient city in China. Based on field testing results of three fissures with different characteristics, we compared previous earth cliffs with reinforcement ones by means of grouting. Analysis results show that it is feasible to reinforce cliff by means of the composite method reported by authors, which jointly applies the grouting of Polystyrene (PS) material and the anchoring technology for fissure earth-cliffs of Jiaohe ancient city. Meanwhile, the composite method of reinforcement could obviously improve the integral strength of potentially dangerous cliffs. This means PS material should be a safety media to apply into the reinforcement and the author’s method could be helpful to protect the ruins of Jiaohe ancient city.

scholarly journals Development of a rapid field testing method for metals in horizontal directional drilling residuals with XRF sensor

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hailin Zhang ◽  
João Antonangelo ◽  
Chad Penn
Keyword(s):  
Moisture Content ◽  
Standard Method ◽  
Field Testing ◽  
Field Method ◽  
Filter Press ◽  
Directional Drilling ◽  
Horizontal Directional Drilling ◽  
Excess Water ◽  
Spiked Soil

AbstractPortable X-ray fluorescence (pXRF) spectrometer allows fast in-situ elemental determination without wet digestion for soils or geological materials, but the use of XRF on wet materials is not well documented. Our objective was to develop a rapid field method using pXRF to measure metals in the residues from horizontal directional drilling (HDD) operations so that proper disposal decisions can be made in-situ. To establish the procedure, we spiked soil samples with 4 concentrations of Cr, Ni, Cu, Zn, As, Cd, and Pb up to 1000 mg kg−1, and then the metal concentrations were determined by wet chemical method after drying and acid digestion (standard method), and by pXRF, also at laboratory conditions, after drying and at two different moisture conditions. The measurements by pXRF and standard method after drying and after removal of excess water (AREW) were highly correlated with slopes ranging from 0.83 ± 0.01 to 1.08 ± 0.01 (P < 0.001) for all metals. The relationship was better AREW than the saturated paste without removal of excess water and the moisture content affected only the accuracy of As, Cd, and Pb. The procedure established was successfully used for HDD residues collected from 26 states of US with moisture content ranging from 14 to 83% AREW. The pXRF was proven to be a reliable tool for fast detection of common metals in dried soils and HDD residues, and samples containing < 30% moisture content without needing to correct for moisture. If the moisture is > 30%, excess water in samples need to be removed with a commercially available filter press to achieve high accuracy. The developed procedures reduce time of metal detection from days to about an hour which allows drilling operators to make quick decisions on soil or HDD disposal.

Sign in / Sign up

Export Citation Format

Share Document