scholarly journals Foundation Treatment Assessment and Postconstruction Settlement Prediction of a Loess High Fill Embankment: A Case Study

2020 ◽  
Vol 2020 ◽  
pp. 1-22
Author(s):  
Caihui Zhu ◽  
Xiaosong Zhou ◽  
Songhe Wang
Keyword(s):  
Water Content ◽  
Test Site ◽  
Temporal Variations ◽  
Dynamic Compaction ◽  
In Situ Tests ◽  
Treatment Methods ◽  
Foundation Treatment ◽  
Vibration Compaction ◽  
Reasonable Prediction

The design of high fill embankments (HFEs) on the loess plateau requires proper foundation treatment methods and reasonable prediction of postconstruction settlement (PCS). In situ tests were carried out on a test section of the collapsible loess foundation of a high fill airport to assess the reinforcement effects of common treatment methods. Based on in situ monitored data, the spatial-temporal variations of the PCS of the HFE were investigated, with a simple empirical formula proposed for PCS prediction. The PCS increases linearly with the fill thickness, and the PCS rate varies exponentially with the fill rate. Two engineering recommendations were made to reduce differential PCS and water damage for the test site. The first is to combine the reinforcement methods to reduce PCS of the HFE, i.e., dynamic compaction for loess foundation with lower water content and gravel piles with stabilizers for that with higher water content. The second is to employ the dynamic compaction (DC), percussive compaction (PC), and vibration compaction (VC) to strengthen the fill to reach an average compaction degree above 0.93 and a water content close to the optimal.

Application on the Artificial Filling Foundation Treatment for Housing Construction Project in Mountain Highway

2014 ◽  
Vol 529 ◽  
pp. 755-758
Author(s):  
A Ling Zhang ◽  
Dan Ni Qi
Keyword(s):  
Construction Project ◽  
Dynamic Compaction ◽  
Housing Construction ◽  
Treatment Methods ◽  
Replacement Method ◽  
Foundation Treatment ◽  
Highway Facilities ◽  
National Investment ◽  
Compaction Method

Along with large national investment in infrastructure construction, the mileage of the highway, which is one of the infrastructures, has increased year by year. There are many kinds of artificial filling foundation treatment methods for housing construction project in mountain highway facilities. This paper, combined with the engineering example, focuses on the dynamic compaction method and the replacement method.

scholarly journals Retraction Note to: Dynamic compaction evaluation using in situ tests in Sagunto’s Harbor, Valencia (Spain)

2020 ◽  
Vol 79 (22) ◽  
Author(s):  
F. Javier Torrijo ◽  
Julio Garzón-Roca ◽  
Santiago Alija ◽  
Mário Quinta-Ferreira
Keyword(s):  
Dynamic Compaction ◽  
In Situ Tests

RETRACTED ARTICLE: Dynamic compaction evaluation using in situ tests in Sagunto’s Harbor, Valencia (Spain)

2017 ◽  
Vol 76 (19) ◽  
Author(s):  
F. Javier Torrijo ◽  
Julio Garzón-Roca ◽  
Santiago Alija ◽  
Mário Quinta-Ferreira
Keyword(s):  
Dynamic Compaction ◽  
In Situ Tests ◽  
Retracted Article

A simple and rapid in situ method for measuring landfill gas emissions and methane oxidation rates in landfill covers

2019 ◽  
Vol 38 (5) ◽  
pp. 588-593 ◽  
Author(s):  
Liang-tong Zhan ◽  
Tao Wu ◽  
Song Feng ◽  
Ji-wu Lan ◽  
Yun-min Chen
Keyword(s):  
Landfill Gas ◽  
Temporal Variations ◽  
Capillary Barrier ◽  
In Situ Tests ◽  
Gas Emissions ◽  
Oxidation Rates ◽  
Laboratory Calibration ◽  
Landfill Covers ◽  
Landfill Gas Emissions

A newly developed static chamber method with a laser methane detector and a biogas analyser was proposed to measure the landfill gas emissions and methane (CH4) oxidation rates in landfill covers. The method relied on a laser methane detector for measuring CH4 concentration, avoiding gas samplings during test and hence the potential interference of gas compositions inside the chamber. All the measurements could be obtained on site. The method was applied to determine the landfill gas emissions and CH4 oxidation rates in a full-scale loess gravel capillary barrier cover constructed in landfill. Both laboratory calibration and in-situ tests demonstrated that fast (i.e. <20 min) and accurate measurements could be obtained by the proposed method. The method is capable of capturing the significant spatial and temporal variations of the landfill gas emissions and CH4 oxidation rates in landfill site.

scholarly journals Study on the Compaction Effect Factors of Lime-treated Loess Highway Embankments

2017 ◽  
Vol 3 (11) ◽  
pp. 1008 ◽  
Author(s):  
Yuyu Zhang ◽  
Wanjun Ye ◽  
Zuoren Wang
Keyword(s):  
Water Content ◽  
Dry Density ◽  
In Situ Tests ◽  
Maximum Dry Density ◽  
Lime Content ◽  
Optimum Water Content ◽  
Compaction Energy ◽  
Highway Embankments ◽  
Optimum Water

This paper presents a study to investigate the effects of water content, lime content and compaction energy on the compaction characteristics of lime-treated loess highway embankments. Laboratory compaction tests were conducted to determine the maximum dry density  and optimum water content  of loess with different lime Contents (0, 3, 5 and 8%), and to examine the effects of water content, lime content and compaction energy on the value of  and . In situ compaction tests were performed to obtain the in situ dry density  and the degree of compaction  of different lime-treated loess. Experimental embankments with different fill materials (0, 3, 5 and 8% lime treated loess) were compacted by different rollers during in situ tests. The results indicate that  increases due to the increase of water content . Once water content exceeds , dry density  decreases dramatically. The addition of lime induced the increase of  and the decrease of . A higher compaction energy results in a higher value of  and a lower value of . The value of  achieves it’s maximum value when in situ water content  was larger than the value of  (+1-2%). The degree of compaction  can hardly be achieved to 100% in the field construction of embankments. Higher water content and compaction energy is needed for optimum compaction.

Experimental Research on Application of Dynamic Compaction for the Treatment of Collapsible Loess Foundation

2014 ◽  
Vol 638-640 ◽  
pp. 441-444 ◽  
Author(s):  
Jun Hui Guo ◽  
Hai Jian Sun ◽  
Bao Ming Wang
Keyword(s):  
Power Plant ◽  
Laboratory Tests ◽  
Dynamic Compaction ◽  
Dry Density ◽  
Foundation Treatment ◽  
Collapsible Loess ◽  
Before And After ◽  
Effective Depth ◽  
Research On Application

The experiment on foundation improvement by dynamic compaction in Collapsible Loess foundation of the power plant was made. Before and after the experiment, kinds of in-situ and laboratory tests were performed .Through these tests, the influence of the dynamic compaction on the character of the soil, such as dry density, collapsibility, bearing capacity is analyzed. The effective depth of improvement of foundation is calculated and the conclusion of the efficiency of the foundation treatment by dynamic compaction is made. The choosing of techniques and parameter of the dynamic compaction also is elaborated in the paper, which make an example for other similar construction in the future.

scholarly journals A Novel Dielectric Tomography System for In-Situ Tracking Three-Dimensional Soil Water Dynamics

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2880
Author(s):  
Song Yu ◽  
Chao Chen ◽  
Qiang Xu ◽  
Qiang Cheng ◽  
Xiaofei Yan ◽  
...  
Keyword(s):  
Steady State ◽  
Water Content ◽  
Soil Water ◽  
Three Dimensional ◽  
Temporal Variations ◽  
Water Dynamics ◽  
Agricultural Crop ◽  
Soil Water Dynamics ◽  
Tomography System

In this study, we developed a novel dielectric tomography system for in-situ tracking three-dimensional (3D) soil water dynamics. The system was designed to control a single dielectric tube sensor that automatically lowered in a PVC tube array installed in-situ to determine the water content of a soil profile, which eliminated probe-to-probe uncertainties and labor costs. Two tests for evaluating the novel system were conducted (i) to analyze and correct the positional error of the probe due to out-of-step errors of stepper motors, and (ii) to track and visualize 3D soil water temporal variations in a soil tank with heterogenetic bulk densities and initial water contents under drip irrigation. The results show that the positioning correcting algorithm combined with starting point alignment can minimize the positioning error of the probe during the 3D tomography. The single drip emitter test illustrated spatial and temporal variations of soil water content due to heterogeneous soil properties in vertical and horizontal directions around the access tube array. Based on these data, 3D distributions of soil water dynamics were visualized. The developed tomography system has potential application to be extended to the local scale in a greenhouse or the large scale in an agricultural field. Future research should explore the performance for agricultural crop irrigation or for modeling and validating soil water flow or hydrological process under either steady state or non-steady state condition.

Cone penetration testing in deltaic soils

1983 ◽  
Vol 20 (1) ◽  
pp. 23-35 ◽  
Author(s):  
R. G. Campanella ◽  
P. K. Robertson ◽  
D. Gillespie
Keyword(s):  
Pore Pressure ◽  
Test Site ◽  
Pressure Measurements ◽  
Test Results ◽  
Cone Penetration ◽  
In Situ Tests ◽  
Penetration Testing ◽  
Cone Penetration Testing ◽  
Laboratory Test Results

A multichannel electric cone penetrometer was used to perform a variety of in situ tests in saturated deltaic deposits.Factors affecting the tip bearing, friction sleeve stress, and pore-water pressures and their interpretation are studied and discussed. Pore pressure measurements were essential to evaluate the in situ test results. The effect of rate of penetration is discussed and the concept of effective bearing introduced as an attempt to interpret cone bearing in undrained or partially drained soil. Field values of consolidation characteristics from pore pressure decay are compared with traditional laboratory consolidation test results on undisturbed samples.The advantages of continuous electric cone logging to evaluate soil stratigraphy are demonstrated. Field and laboratory test results are presented from a test site where stabilization was used to reduce liquefaction potential of hydraulically placed sand and silt. The importance of pore pressure measurements is demonstrated along with examples and recommendations for the location of the porous element.Keywords: static cone penetration testing, in situ testing, pore pressures, consolidation, stratigraphy, liquefaction.

Research of Dynamic Compaction: A Review of Recent Academic Literature

2014 ◽  
Vol 1079-1080 ◽  
pp. 406-409 ◽  
Author(s):  
Bin Bin Xu ◽  
Rui Qi Zhang ◽  
Guo Liang Ye
Keyword(s):  
Literature Review ◽  
Ground Improvement ◽  
Dynamic Compaction ◽  
In Situ Tests ◽  
Academic Literature ◽  
Reinforcement Mechanism ◽  
Effective Reinforcement ◽  
Compaction Method

Dynamic compaction is one of the densification techniques of ground improvement and extensive theoretical, experimental and in-situ tests have been used to clarify its mechanism. In this paper, a literature review about the dynamic compaction is carried out and the emphasis is put on the reinforcement mechanism, effective reinforcement depth and influence range of vibration to give a reference for the ongoing researches of dynamic compaction method.

Sign in / Sign up

Export Citation Format

Share Document