A large-strain radial consolidation theory for soft clays improved by vertical drains

Geng, Xueyu; Yu, Hai‐Sui

doi:10.1680/jgeot.15.t.013

Cited by 102 publications

(33 citation statements)

References 28 publications

(35 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In 1942, Carrillo established the expression of the relationship between the average consolidation degree of unidirectional seepage and the total average consolidation degree of multi-directional seepage, which provided a theoretical basis for simplifying the calculation of multidimensional consolidation (Carrillo, 1942). Thus, consolidation theory has been developed rapidly under the condition of equal strain hypothesis and free strain condition respectively (Barron, 1948;Yoshikuni & Nakanodo, 1974;Hansbo, Jamiolkowski, & Kok, 1981;Xie & Zeng, 1989;Wang, Shen, Ho, & Kim, 2013;Basack & Nimbalkar, 2017;Geng & Yu, 2017).…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Consolidation Theory of Vertical Drain Based on Continuous Drainage Boundary

Zhang

Mei

et al. 2019

Journal of Civil Engineering and Management

View full text Add to dashboard Cite

To remedy the limitation that the conventional drainage boundary only considers two extreme cases of pervious and impervious boundaries, the consolidation theory of vertical drain is derived by applying the continuous drainage boundary, and its validity is also proven. Based on the obtained solutions, the excess pore water pressure and the average degree of consolidation under the continuous drainage boundary condition are analyzed, and the effect of the drainage capacity of the top surface, the smear effect and the well resistance on consolidation are explored. Furthermore, the practicality of this theory is also validated by the comparison with experimental data. Results confirm that the complete and continuous process of the ground top surface can be changed from no drainage to a complete drainage by adjusting the value of the interface parameter b. Higher value of the interface parameter b means a stronger water permeability of the foundation, resulting in a faster dissipation of excess pore water pressure and a faster consolidation. Meanwhile, the vertical drainage of the vertical drain cannot be neglected in calculation even though vertical drains are based on a horizontal seepage. Moreover, the smear effect and the well resistance play an important role on consolidation.

show abstract

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Consolidation Theory of Vertical Drain Based on Continuous Drainage Boundary

Zhang

Mei

et al. 2019

Journal of Civil Engineering and Management

View full text Add to dashboard Cite

show abstract

“…Mechanical properties are key engineering properties of soils in geotechnical engineering practices. For those natural soils that have insufficient mechanical strength, soil treatment is often employed [1][2][3][4][5][6][7]. Recently, the incorporation of biopolymers into soil stabilisation has gained increasing credence in sustainable geotechnical engineering for their environmental benefits [8][9][10][11], high strengthening efficiency [12][13][14], abundance in nature [15][16][17], suitable functional properties such as pH stability and ionic salt compatibility [18][19][20] and reasonable prices [8,21,22].…”

Section: Introductionmentioning

confidence: 99%

The Optimisation Analysis of Sand-Clay Mixtures Stabilised with Xanthan Gum Biopolymers

Hao

Chen

et al. 2021

Sustainability

View full text Add to dashboard Cite

Sand–clay mixtures can be encountered in both natural soils (e.g., residual soils, clay deposits and clinosols) and artificial fills. The method of utilising biopolymers in ground improvement for sand–clay mixtures has emerged recently. However, a full understanding of the strengthening effect of biopolymer-treated sand–clay mixtures has not yet been achieved due to a limited number of relevant studies. In this study, xanthan gum (XG), as one of the eco-friendly biopolymers, was used to treat reconstituted sand–clay mixtures that had various compositions in related to clay (or sand) content and clay type (kaolin and bentonite). A series of laboratory unconfined compression strength (UCS) tests were conducted to probe the performances of XG-treated sand–clay mixtures from two aspects, i.e., optimum treatment conditions (e.g., XG content and initial moisture content) to achieve the maximum strengthening effect and strengthening efficiency for the sand–clay mixtures with different compositions. The experimental results indicated that the optimum initial moisture content decreased as the sand content increased. The optimum XG content, which also decreased with the increasing sand content, remained approximately 3.75% for all sand–kaolin mixtures and 5.75% for all sand–bentonite mixtures if calculated based on clay fraction. While untreated sand–kaolin mixtures and sand–bentonite mixtures had comparable UCS values, XG-treated sand–kaolin mixtures seemed to have better improved mechanical strength due to higher ionic (or hydrogen) bonds with XG and low-swelling properties compared with bentonite. The deformation modulus of XG-treated sand–clay mixtures were positively related with UCS. The variation in UCS and stiffness for each treatment condition increased as the sand content was elevated for both sand-kaolin and sand-bentonite mixtures. An increment in the proportion of the heterogeneous composite formed by irregular sand particles conglomerated with the XG–clay matrix in total soil might be responsible for this phenomenon.

show abstract

“…Civil engineering infrastructures are commonly constructed on weak or loose soils that requires improvement to resist applied loads [1][2][3][4]. In recent years, biopolymer, as directly utilised biogenic excrement, is characterized as one type of potential ecofriendly materials to be used for ground improvement.…”

Section: Introductionmentioning

confidence: 99%

Fall cone test on biopolymer-treated clay

Cheng

Haotian

et al. 2020

E3S Web Conf.

View full text Add to dashboard Cite

Fall cone tests were conducted to evaluate the consistency variations of clay soils treated with six types of biopolymers, e.g. carrageenan kappa gum (KG), locust bean gum (BG), xanthan gum (XG), agar gum (AG), guar gum (GG) and sodium alginate (SA) at various concentrations (e.g. between 0.1% to 5% biopolymer to soil mass ratio). The dependences of shear viscosity on water content, and undrained shear strength on water content were established. The results indicated that KG and SA increased the liquid limit (LL) of treated soils after the biopolymer content exceeded a certain limit (e.g. 0.5%), BG and GG contributed to a peak point in LL at biopolymer concentration of 1% to 2%, while XG and AG almost did not change the LL at all. The plastic limit (PL) was about 25% to 50% of the LL, leading to a trend of plasticity index (PI) similar to liquid limit. In order to further simplify the testing procedure and get the Atterberg limits for biopolymer-treated soil, one-point method was adopted.

show abstract

A large-strain radial consolidation theory for soft clays improved by vertical drains

Cited by 102 publications

References 28 publications

Three-Dimensional Consolidation Theory of Vertical Drain Based on Continuous Drainage Boundary

Three-Dimensional Consolidation Theory of Vertical Drain Based on Continuous Drainage Boundary

The Optimisation Analysis of Sand-Clay Mixtures Stabilised with Xanthan Gum Biopolymers

Fall cone test on biopolymer-treated clay

Contact Info

Product

Resources

About