Use of Soil–Cement Bed to Improve Bearing Capacity of Stone Columns

Das, Manita; Dey, Ashim Kanti

doi:10.1061/(asce)gm.1943-5622.0001655

Cited by 17 publications

(3 citation statements)

References 61 publications

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“…The unconfined compressive stress–strain curve can be obtained through the unconfined compressive strength test; the triaxial compression stress–strain curve can be obtained from the triaxial compression test, which generally has three stages: linear elasticity, yield, and ductile flow. Scholars have added soil conditioners to improve soil strength in their research on soil improvement experiments, including poly-Lys [ 65 ], foaming agents [ 66 , 67 ], reactive magnesium oxide [ 68 ], bentonite [ 69 , 70 ], cement [ 71 , 72 , 73 ], fiber [ 74 , 75 ], polyacrylamide [ 76 , 77 ], and quicklime [ 78 , 79 , 80 ]. The improvement effects using different contents of modifiers have been discussed, and the overall strength has improved; however, the production of soil modifiers such as cement and lime causes great pollution to the environment.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Silt Soil Improved by Microbial Solidification with the Use of Lignin

Sun

Zhong

et al. 2023

Microorganisms

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At present, in the field of geotechnical engineering and agricultural production, with increasingly serious pollution an environmentally friendly and efficient means is urgently needed to improve the soil mass. This paper mainly studied the microbial induced calcium carbonate precipitation (MICP) technology and the combined effect of MICP technology and lignin on the improvement of silt in the Beijing area. Through unconfined compressive strength and dynamic triaxial test methods, samples improved by microorganisms were studied to obtain the optimal values of cement concentration and lignin under these two test schemes. The results show that after the incubation time of Sporosarcina pasteurii reached 24 h, the OD600 value was 1.7–2.0 and the activity value (U) was 930–1000 mM ms/min. In the unconfined static pressure strength test, after MICP treatment the optimal concentration of cementitious solution for constant temperature and humidity samples and constant-temperature immersion samples was 1.25 mol/L. The compressive strength of the constant temperature and humidity sample was 1.73 MPa, and the compressive strength of the constant-temperature immersion sample was 3.62 Mpa. At the concentration of 1.25 mol/L of cement solution, MICP technology combined with lignin could improve the constant temperature and humidity silt sample. The optimal addition ratio of lignin was 4%, and its compressive strength was 1.9 MPa. The optimal lignin addition ratio of the sample soaked at a constant temperature was 3%, and the compressive strength was 4.84 MPa. In the dynamic triaxial multi-stage cyclic load test, the optimal concentration of cementation solution for the constant temperature and humidity sample after MICP treatment was 1.0 mol/L, and the failure was mainly inclined cracks. However, in the condition of joint improvement of MICP and lignin, the sample mainly had a drum-shaped deformation, the optimal lignin addition ratio was 4%, and the maximum axial load that the sample could bear was 306.08 N. When the axial dynamic load reached 300 N, the strain accumulation of the 4% group was only 2.3 mm. In this paper, lignin, an ecofriendly material, was introduced on the basis of MICP technology. According to the failure shape and relevant results of the sample, the addition of lignin was beneficial for the improvement of the compressive strength of the sample.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Silt Soil Improved by Microbial Solidification with the Use of Lignin

Sun

Zhong

et al. 2023

Microorganisms

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“…Soil reinforcement using stone columns and geosynthetics has been widely used as an important method of soil reinforcement. There have been a wide number of studies based on analytical [3][4][5][6][7], experimental [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], and numerical [7,19,21,[23][24][25][26][27] analyses on soil reinforcement. There are also various state-of-the-art studies which signify the need for such types of analyses [28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Horizontally Layered and Vertically Encased Geosynthetic Reinforced Stone Column: An Experimental Analysis

Srijan

Gupta

2023

Applied Sciences

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Because of the smaller confinement of the neighbouring soil in very weak soils, the carrying capacity of stone columns may not substantially increase. Geosynthetics can be used to reinforce columns by employing vertical encasement or horizontal layers. In the present study, large-scale laboratory investigations were carried out to evaluate the efficacy of vertical encasement and horizontal layering geosynthetics on the performance behaviour of soft clay. A series of tests were carried out for a horizontal layering of a geotextile with an equal distance throughout the height of the column (the total height of the column is ‘L’); horizontal layering over only the top half (i.e., 0.5 L from the head of the considered column); and horizontal layering over only the bottom half of the column (0.5 L from the centre to the foot of the column). Tests were also carried out for vertical encasement in the form of vertically encased stone columns (VESCs) that were employed for various lengths of encasement (i.e., L, 0.75 L, 0.5 L, 0.25 L). The tests were conducted for three different diameters of stone columns, i.e., 50 mm, 75 mm, and 100 mm. As per the findings, the utilisation of horizontal and vertical reinforcing layers enhances the carrying capability of stone columns. Moreover, because of their interlocking and frictional actions with the aggregates of stone columns, the layering decreases the lateral bulging of the considered stone columns. A comparison was performed to find the effectiveness of the horizontal and vertical types of reinforcement, and it was observed that VESCs with full-length encasement and a geotextile with a higher tensile strength for a 100 mm diameter of the stone column were the most desirable arrangements among all.

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“…Ranaivomanana et al 7 used cement for stabilization of two types of soil and showed its effectiveness in stabilization of the soils. Das et al 8 also examined the effect of cement in improving the bearing capacity of stone columns and reported encouraging results. In the case of cement, the stabilization of soil is through hydration of cement and the resulting cementitious materials such as CSH (calcium silicate hydrate) and CAH (calcium aluminate hydrate) and CASH (calcium aluminium silicate hydrate).…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnesia on Stabilization of Contaminated Clay Soil

Estabragh¹,

Jandari²,

Javadi³

et al. 2022

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In this study the effect of MgO (Magnesia) on stabilization of a clay soil contaminated with glycerol was investigated through a series of experiments. The tests were performed in two groups. In the first group the natural soil was mixed with 5, 8 and 12% MgO. A set of tests including unconfined compressive strength (UCS) test were conducted on samples prepared at curing times of 7, 14 and 28 days. In addition, a number of samples prepared with different percentages of MgO were subjected to CO2 under pressure of 0.5 bar for periods of 4, 8 and 24 hours. In the second group the soil was contaminated with 4, 8 and 12% glycerol and was then mixed with 5, 8 and 12% MgO. A group of tests, similar to the first group, were conducted on the contaminated samples. The results showed that adding MgO to the natural soil and the contaminated soil increases the strength of the soil and the amount of increase in strength depends on the percent of MgO and the curing time. During stabilization, the contaminated soil with 8 and 12% glycerol gained more strength than the natural soil. The results also indicated that forced carbonation can facilitate the stabilization of MgO-stabilized natural and contaminated soils in a few hours compared with conventional methods that take several days. SEM results showed that the gained strength for both groups is resulted from the interaction between the soil and MgO.

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Use of Soil–Cement Bed to Improve Bearing Capacity of Stone Columns

Cited by 17 publications

References 61 publications

Experimental Study on Silt Soil Improved by Microbial Solidification with the Use of Lignin

Experimental Study on Silt Soil Improved by Microbial Solidification with the Use of Lignin

Horizontally Layered and Vertically Encased Geosynthetic Reinforced Stone Column: An Experimental Analysis

Effect of Magnesia on Stabilization of Contaminated Clay Soil

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