Prediction of Shear Strength of Fully Weathered Coastal Red Sandstone: Influence of Water Content, Fine Content, and Relative Compaction

Xu, Haiyan; Cai, Libin; Shao, Zimeng; Wang, Zhijie; Li, Zhen; Huang, Chenchen

doi:10.2112/jcoastres-d-20-00139.1

Cited by 6 publications

(3 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the compaction degree was 0.90, the shear strength was 130 kPa, and when the compaction degree was 0.93, the shear strength was 210 kPa. When the compaction degree was between 0.86 and 0.93, as the compaction degree increased, its shear resistance also increased, and the displacement curve of the failure point moved to the right [ 35 ].…”

Section: Analysis Of Test Resultsmentioning

confidence: 99%

Influence Mechanism of Water Content and Compaction Degree on Shear Strength of Red Clay with High Liquid Limit

Feng,

Teng,

Wang

2023

Materials

View full text Add to dashboard Cite

To investigate the influencing factors and mechanisms of shear strength of red clay with a high liquid limit, which was selected at different milepost locations based on the Nanning Bobai Nabu Section Project of the Nanning Zhanjiang Expressway, the basic physical properties of red clay were determined using a liquid plastic limit test, compaction test, inductively coupled plasma optical emission spectrometer (ICP-OES), and X-ray fully automatic diffractometer (XRD). Red clay with a high liquid limit was selected. Furthermore, the direct shear test was used to study the effect of different water contents and compaction degrees on the shear strength. The experimental results demonstrate that under the same compaction degree, the shear stress of the soil sample increases significantly with an increase in normal stress, and the greater the water content, the smaller the shear stress of the soil sample. At 200 kPa, the shear strength of soil samples with 24% water content is 57%, 46%, and 35% of the shear strength of soil samples with 15% water content under different compaction degrees(K) of 86%, 90%, and 93%, respectively. Under the same moisture content, the shear stress of the soil sample shows an increasing trend with an increase in the degree of compaction, and the greater the compaction degrees, the greater the shear stress of the soil sample. The cohesion c and internal friction angle φ of soil samples increase with an increase in the compaction degree, but the increase in cohesion c is also affected by the water content. Under the condition of low water content, the cohesion c of soil samples can be increased by 1.06 times when the water content is 15% and by 0.47 times when the water content is 18%. Under the condition of high water content, the cohesion c of soil samples with 21% water content only increases by 0.3 times, and that with 24% water content only increases by 0.35 times.

show abstract

Section: Analysis Of Test Resultsmentioning

confidence: 99%

Influence Mechanism of Water Content and Compaction Degree on Shear Strength of Red Clay with High Liquid Limit

Feng,

Teng,

Wang

2023

Materials

View full text Add to dashboard Cite

show abstract

“…Red sandstone can easily disintegrate and soften when exposed to water, which a characteristics different from other common sandstone [14][15][16][17] . The change of moisture content in soils causes the disintegration of red sandstone, which is also a natural phenomenon 18 .…”

Section: Introductionmentioning

confidence: 94%

“…As a result, the spaces among the soil particles expand and the soil changes its porous fabric [1][2][3][4] , the micro-structures of soils could be significantly changed and then give rise to a change in hydraulic properties [5][6][7] . The wetting-drying cycles can also significantly influence the mechanical behavior and performance of soils in various geotechnical applications [8][9][10][11][12][13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

Dynamic elasticity modulus of weathered red sandstone soil subject to drying-wetting cycles

Yun-ye

2023

Preprint

View full text Add to dashboard Cite

The drying-wetting cycles has a significant effect on the dynamic behavior of the weathered red sandstone soil. A series of the unconsolidated undrained dynamic triaxial tests were conducted on the weathered red sandstone soil samples under different numbers of drying-wetting cycles N, and the hysteresis curves and dynamic backbone curves were obtained under different confining pressures σ3. A hyperbolic model of dynamic backbone curve based on Hardin-Drnevich model was proposed, and the regression expressions between the parameters of the proposed model and N were presented. The relation between the maximum dynamic elasticity modulus Edmax and N, σ3 was analyzed based on the proposed hyperbolic model. The fitting equation of dynamic elasticity modulus Ed and dynamic stress σd was put forward, and the relation between dynamic elasticity modulus Ed and N was studied. The main conclusions from this work as follows: (1) Hardin-Drnevich model can well express the hyperbolic behaviors of dynamic backbone curves of the weathered red sandstone soil. The proposed hyperbolic model and the expressions of Edmax and Ed can well reflect the influences of the numbers of drying-wetting cycles and σ3 on Edmax and Ed respectively. (2) Edmax and Ed increase with the increase of σ3 under certain N; and decrease with N under a certain σ3. (3) Ed of the weathered red sandstone soil increases non-linearly with the increase of dynamic strain εd. The introduced factor β can quantitatively reflects the influences of N on Edmax .

show abstract

Discrete Element Study on Mesoscopic Shear Mechanical Behavior of Fully Weathered Coastal Red Sandstone Considering Different Rock Mass Stability Grades

Wang,

Rui,

et al. 2023

KSCE J Civ Eng

View full text Add to dashboard Cite

Prediction of Shear Strength of Fully Weathered Coastal Red Sandstone: Influence of Water Content, Fine Content, and Relative Compaction

Cited by 6 publications

References 42 publications

Influence Mechanism of Water Content and Compaction Degree on Shear Strength of Red Clay with High Liquid Limit

Influence Mechanism of Water Content and Compaction Degree on Shear Strength of Red Clay with High Liquid Limit

Dynamic elasticity modulus of weathered red sandstone soil subject to drying-wetting cycles

Discrete Element Study on Mesoscopic Shear Mechanical Behavior of Fully Weathered Coastal Red Sandstone Considering Different Rock Mass Stability Grades

Contact Info

Product

Resources

About