A new approach for longitudinal vibration of a large-diameter floating pipe pile in visco-elastic soil considering the three-dimensional wave effects

Meng, Kun; Cui, Chunyi; Liang, Zhimeng; Li, Haijiang; Pei, Huafu

doi:10.1016/j.compgeo.2020.103840

Cited by 158 publications

(57 citation statements)

References 41 publications

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“…e test methods are as follows: firstly, the standard soil samples with different initial conditions are prepared by ring knife method; secondly, the soil samples are soaked in water (each sample has different amount of immersion); thirdly, the height change of soil samples after immersion is measured; finally, the soil samples are dried to calculate the moisture content change of each soil sample. [10] and Meng et al [12] showed that, under the condition of no load, the moisture absorption of the expansive soil gradually stabilized after 6 h and after 24 hours, and expansion was no longer changed). (4) e soil sample was put into the drying box for moisture content determination; (5) After 24 hours, the dried soil samples were taken out, and the weight of each soil sample was measured.…”

Section: Test Methodsmentioning

confidence: 99%

“…Moreover, several studies investigate the effects of temperature on the behavior of collapse loess [10,11]. When expansive soils are subjected to water changes, excessive deformation may be induced, which may threaten underground structures [12][13][14][15][16][17]. Since expansion and shrinkage are induced in expansive soils when subjected to water changes, more and more studies have been conducted to the deformation characteristic of reinforced expansive soil [18].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Relationship between Free Load Swelling Rate and Water Content of Medium Expansive Soil

Cheng¹,

Yang

Wei³

et al. 2021

Advances in Civil Engineering

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Expansive soil has the property of water swelling, which is related not only to the hydrophilic mineral composition of soil particles and the microstructure of soil, but also to the initial moisture content, dry density, and overburden condition of soil. Based on the typical expansive soil in a certain area, the samples were sampled and remodeled at the site. Extensive experimental tests were conducted to investigate the relationship between the hygroscopic expansion rate and the water content of the expansive soil under different initial moisture content, dry density, and free load. The results showed that, under the condition of natural initial water content and dry density, although the hygroscopic expansion rate of the medium expansive soil was nonlinear with the subsequent water content, in the range of large water content (within about 50%), the expansive soil swelled linearly. There was a linear relationship between the rate and the water content. With the increase of the initial water content, the hygroscopic expansion rate and expansion rate of the expansive soil decreased. With the increase of the dry density, the hygroscopic expansion rate and the expansion rate of the expansive soil increased. The water absorption performance did not decrease, and the soil continued to maintain the previous moisture absorption rate and expansion rate after the soil reached saturation, while after the water content reached 1.5∼2.0 times the saturated water content, the soil moisture absorption expansion rate gradually decreased until it finally stabilized. The slope k of the expansion rate increased with the initial dry density and decreased with the initial moisture content. As dry density was increased, the slope k was increased at an increased rate. Moreover, as the initial moisture content was decreased, the slope k was increased at an increased rate.

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Section: Test Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on Relationship between Free Load Swelling Rate and Water Content of Medium Expansive Soil

Cheng¹,

Yang

Wei³

et al. 2021

Advances in Civil Engineering

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show abstract

“…The biochemical characteristic parameters of the proposed coupled model are calibrated according to the relationship between the C/L values and the filling ages of borehole samples, the parameters are shown in Table 2. The mechanical characteristic parameters of MSW are selected based on the recommended parameter value range of typical landfills with high kitchen waste content in China [29][30][31]. A numerical model of landfill cell with a height of 40 m is established to predict the stabilization process of the Jiangcungou landfill.…”

Section: Prediction Of the Stabilization Process Of The Jiangcungou Landfill In Xi'an Chinamentioning

confidence: 99%

The Evaluation System of the Sustainable Development of Municipal Solid Waste Landfills and Its Application

et al. 2021

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Improving the understanding of the stabilization process is of great significance to guide the sustainable development of municipal solid waste (MSW) landfills. An evaluation system of the stabilization process of MSW landfills has been established. The indices of the evaluation system involve the degradation degree of MSW, the release of landfill gas production potential, and the settlement of landfills. Based on the biochemical-consolidation-solute migration coupled model, an evaluation method of the MSW landfill stabilization process is proposed by combining field tests with numerical simulation. The stabilization process of the Jiangcungou landfill in China is investigated by using the proposed method. The analyzed results show that the stabilization process of high kitchen waste content landfills can be divided into three stages, which is different from the stabilization process of landfills in developed countries. For the Jiangcungou landfill, the ratio of cellulose to lignin in MSW decreases rapidly during the fast degradation stage when obvious settlement occurs. During the slow degradation stage, the hydrolysis rate is slow and settlement develops slowly. When the landfill reaches the stabilization stage, the ratio of cellulose to lignin of MSW changes very slowly; most of the landfill gas potential has been released; the settlement stabilization is completed basically. The change processes of the three evaluation indices are different, of which the degradation stabilization index is the main one. According to the findings above, leachate recirculation is recommended to adjust the degradation environment in the landfill, which can be helpful to avoid acidification at the fast degradation stage. Temporary cover is suggested to improve landfill gas collection efficiency at the beginning of the stable methanogenic stage. The landfill site closure should be operated when the settlement rate is low.

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“…With the annually increased consumption of OPC, there is a strong need for sustainable development [26][27][28]. To improve the performance of cement-based materials and reduce CO2 emissions, special types of cement were applied as an alternative to OPC in certain situations, in which calcium sulfoaluminate (CSA) cement has attracted attention [29][30][31][32]. CSA has characters of rapid hardening, high early strength, resistance to sulfate attack, and tailored expansion [33].…”

Section: Introductionmentioning

confidence: 99%

Strength Performance and Microstructure of Calcium Sulfoaluminate Cement-Stabilized Soft Soil

et al. 2021

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Calcium sulfoaluminate cement (CSA) was used to stabilize a type of marine soft soil in Dalian China. Unconfined compressive strength (UCS) of CSA-stabilized soil was tested and compared to ordinary Portland cement (OPC); meanwhile the influence of amounts of gypsum in CSA and cement contents in stabilized soils on the strength of stabilized soils were investigated. X-ray diffraction (XRD) tests were employed to detect generated hydration products, and scanning electron microscopy (SEM) was conducted to analyze microstructures of CSA-stabilized soils. The results showed that UCS of CSA-stabilized soils at 1, 3, and 28 d firstly increased and then decreased with contents of gypsum increasing from 0 to 40 wt.%, and CSA-stabilized soils exhibited the highest UCS when the content of gypsum equaled 25 wt.%. When the mixing amounts of OPC and CSA were the same, CSA-stabilized soils had a significantly higher early strength (1 and 3 d) than OPC. For CSA-stabilized soil with 0 wt.% gypsum, monosulfate (AFm) was detected as a major hydration product. As for CSA-stabilized soil with certain amounts of gypsum, the intensity of ettringite (Aft) was significantly higher than that in the sample hydrating without gypsum, but a tiny peak of AFm also could be detected in the sample with 15 wt.% gypsum at 28 d. Additionally, the intensity of AFt increased with the contents of gypsum increasing from 0 to 25 wt.%. When contents of gypsum increased from 25 to 40 wt.%, the intensity of AFt tended to decrease slightly, and residual gypsum could be detected in the sample with 40 wt.% gypsum at 28 d. In the microstructure of OPC-stabilized soils, hexagonal plate-shaped calcium hydroxide (CH) constituted skeleton structures, and clusters of hydrated calcium silicates (C-S-H) gel adhered to particles of soils. In the microstructure of CSA-stabilized soils, AFt constituted skeleton structures, and the crystalline sizes of ettringite increased with contents of gypsum increasing; meanwhile, clusters of the aluminum hydroxide (AH3) phase could be observed to adhere to particles of soils and strengthen the interaction.

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A new approach for longitudinal vibration of a large-diameter floating pipe pile in visco-elastic soil considering the three-dimensional wave effects

Cited by 158 publications

References 41 publications

Experimental Study on Relationship between Free Load Swelling Rate and Water Content of Medium Expansive Soil

Experimental Study on Relationship between Free Load Swelling Rate and Water Content of Medium Expansive Soil

The Evaluation System of the Sustainable Development of Municipal Solid Waste Landfills and Its Application

Strength Performance and Microstructure of Calcium Sulfoaluminate Cement-Stabilized Soft Soil

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