• 제목/요약/키워드: Soil Shear Strength

검색결과 763건 처리시간 0.025초

Physical and numerical modelling of the inherent variability of shear strength in soil mechanics

  • Chenari, Reza Jamshidi;Fatahi, Behzad;Ghoreishi, Malahat;Taleb, Ali
    • Geomechanics and Engineering
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    • 제17권1호
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    • pp.31-45
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    • 2019
  • In this study the spatial variability of soils is substantiated physically and numerically by using random field theory. Heterogeneous samples are fabricated by combining nine homogeneous soil clusters that are assumed to be elements of an adopted random field. Homogeneous soils are prepared by mixing different percentages of kaolin and bentonite at water contents equivalent to their respective liquid limits. Comprehensive characteristic laboratory tests were carried out before embarking on direct shear experiments to deduce the basic correlations and properties of nine homogeneous soil clusters that serve to reconstitute the heterogeneous samples. The tests consist of Atterberg limits, and Oedometric and unconfined compression tests. The undrained shear strength of nine soil clusters were measured by the unconfined compression test data, and then correlations were made between the water content and the strength and stiffness of soil samples with different consistency limits. The direct shear strength of heterogeneous samples of different stochastic properties was then evaluated by physical and numerical modelling using FISH code programming in finite difference software of $FLAC^{3D}$. The results of the experimental and stochastic numerical analyses were then compared. The deviation of numerical simulations from direct shear load-displacement profiles taken from different sources were discussed, potential sources of error was introduced and elaborated. This study was primarily to explain the mathematical and physical procedures of sample preparation in stochastic soil mechanics. It can be extended to different problems and applications in geotechnical engineering discipline to take in to account the variability of strength and deformation parameters.

Experimental study on damage and debonding of the frozen soil-concrete interface under freeze-thaw cycles

  • Liyun Tang;Yang Du;Liujun Yang;Xin Wang;Long Jin;Miaomiao Bai
    • Structural Engineering and Mechanics
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    • 제86권5호
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    • pp.663-671
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    • 2023
  • Freeze-thaw cycles induce strength loss at the frozen soil-concrete interface and deterioration of bonding, which causes construction engineering problems. To clarify the deterioration characteristics of the interface under the freeze-thaw cycle, a frozen soil-concrete sample was used as the research object, an interface scanning electron microscope test under the freeze-thaw cycle was carried out to identify the micro index information, and an interface shear test was carried out to explore the loss law of interface shear strength under the freeze-thaw cycle. The results showed that the integrity of the interface was destroyed, and the pore number and pore size of the interface increased significantly with the number of freeze-thaw cycles. The connection form gradually deteriorates from surface-to-surface contact to point-to-surface contact and point-to-point contact, and the interfacial shear strength decreases the most at 0-3 freeze-thaw cycles, with small decreases from to 3-8 cycles. After 12 freeze-thaw cycles, the interfacial shear strength tends to be stable, and shear the failure occurs internally in the soil.

Geotechnical engineering behavior of biopolymer-treated soft marine soil

  • Kwon, Yeong-Man;Chang, Ilhan;Lee, Minhyeong;Cho, Gye-Chun
    • Geomechanics and Engineering
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    • 제17권5호
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    • pp.453-464
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    • 2019
  • Soft marine soil has high fine-grained soil content and in-situ water content. Thus, it has low shear strength and bearing capacity and is susceptible to a large settlement, which leads to difficulties with coastal infrastructure construction. Therefore, strength improvement and settlement control are essential considerations for construction on soft marine soil deposits. Biopolymers show their potential for improving soil stability, which can reduce the environmental drawbacks of conventional soil treatment. This study used two biopolymers, an anionic xanthan gum biopolymer and a cationic ${\varepsilon}-polylysine$ biopolymer, as representatives to enhance the geotechnical engineering properties of soft marine soil. Effects of the biopolymers on marine soil were analyzed through a series of experiments considering the Atterberg limits, shear strength at a constant water content, compressive strength in a dry condition, laboratory consolidation, and sedimentation. Xanthan gum treatment affects the Atterberg limits, shear strength, and compressive strength by interparticle bonding and the formation of a viscous hydrogel. However, xanthan gum delays the consolidation procedure and increases the compressibility of soils. While ${\varepsilon}-polylysine$ treatment does not affect compressive strength, it shows potential for coagulating soil particles in a suspension state. ${\varepsilon}-Polylysine$ forms bridges between soil particles, showing an increase in settling velocity and final sediment density. The results of this study show various potential applications of biopolymers. Xanthan gum biopolymer was identified as a soil strengthening material, while ${\varepsilon}-polylysine$ biopolymer can be applied as a soil-coagulating material.

인공신경망을 이용한 풍화토의 강도정수 산정 (Assessment of Shear Strength Parameter for Weathered Soils Using Artificial Neural Network)

  • 이무철;이송
    • 한국구조물진단유지관리공학회 논문집
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    • 제12권3호
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    • pp.147-154
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    • 2008
  • 풍화토 사면은 장시간 공기에 노출되거나 물과 접촉을 하게 되면 전단강도가 급격히 저하되며 계절에 따른 수위의 변화가 매우 큰 댐사면의 경우는 강도저하가 더욱 크게 발생한다. 풍화토 사면의 강도저하 파악을 위하여 반복전단시험 및 수침 건조를 반복한 시료에 대한 잔류강도 시험을 통해 포화에 따른 강도의 저하를 파악하였다. 또한 소형동적콘관입시험기를 이용하여 관입타격횟수와 전단강도정수관계를 파악하고 인공신경망 해석을 통하여 관입타격횟수 Nc를 이용한 전단강도정수의 예측이 용이하도록 상관식을 구성하였다.

입자 결합 및 파쇄 형태에 따른 전단거동 특성 (Characteristics of Shear Behavior According to State of Particle Bonding and Crushing)

  • 정선아;김은경;이동석;이석원
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2010년도 춘계 학술발표회
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    • pp.314-323
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    • 2010
  • Recently, granular soils having a large particle size are frequently used as a filling material in the construction of foundation, harbor, dam, and so on. The shear behavior of this granular soil plays a key role in the stability of structures. For example, soil particle crushing occurring at the interface between structure and soil and/or within soil mass can cause the disturbance of ground characteristics and consequently induce an issues in respect of stability of structures. In order to investigate the shear behavior according to an existence and nonexistence of particle crushing, numerical analyses were conducted by using the DEM(Discrete Element Method)-based software program PFC(Particle Flow Code). Using the crushing model and non-crushing model which were created in this study, numerical analyses of ring shear test were conducted and their results were analyzed and compared. In general, landslide and slope stability are accompanied by a large displacement and consequently not only a peak strength but also a residual strength are very important in the analysis of landslide and slope stability. However the direct shear test which has been commonly used in the determination of shear strength parameters has a limitation on displacement therefore the residual strength parameters can not be obtained. The characteristics of residual shear behavior were investigated through the numerical analyses in this study.

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자생초화류 뿌리의 전단강도 보강효과에 대한 연구 (A study on the increase in shear strength of soil by root systems of indigenous plants)

  • 우철웅;최상운;장병욱
    • 한국농공학회:학술대회논문집
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    • 한국농공학회 2002년도 학술발표회 발표논문집
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    • pp.325-328
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    • 2002
  • Recently, attempts to use indigenous plants have been made for the recovery of nature of slopes and making permanent vegetation group, harmonizing with surroundings from the ecological perspective. For surface failure prevention of slopes, indigenous plants are known as superior to those of exotic grasses, but studies how much indigenous plants influence shear strength of soil is lacking. Therefore, in this study, strength increasement of the root-soil system were investigated for four indigenous plants.

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Soil-Bentonite 혼합토의 강도 및 투수 특성 (Strength and Permeability Characteristics of Soil-Bentonite Mixture)

  • 김광일;임은상;김기영;신동훈
    • 한국지반환경공학회 논문집
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    • 제11권4호
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    • pp.5-12
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    • 2010
  • 차수재로서 벤토나이트를 혼화재로 사용한 혼합토가 매립장, 제방, 댐 등의 다양한 구조물의 차수재로서 많이 이용되고 있다. 그러나 시공 시 외부하중, 성토하중 등에 의한 차수층의 전단파괴가 발생하여 침투수의 침투 등이 예상 되지만 일반적으로 혼합토의 투수계수만 고려할 뿐 혼화재양에 따른 강도변화는 고려하지 않고 있는 실정이다. 이에 본 연구에서는 벤토나이트 함량의 변화가 혼합토의 투수 및 강도에 미치는 영향에 대하여 고찰하고자 B댐 축조현장 부근 하상시료에 벤토나이트를 0~4%로 변화하면서 일련의 투수시험 및 강도시험을 실시하였다. 시험결과 투수계수는 벤토나이트 함량 4%에서 2.085E-07cm/sec의 값을 가지는 것으로 나타났다. 일축압축강도 및 인장강도는 벤토나이트 함량이 증가함에 따라 증가하는 것으로 나타났으나, 삼축압축(CD)시험에 의한 벤토나이트 혼합토의 전단강도는 벤토나이트 함량 변화의 영향을 거의 받지 않는 것으로 나타났다.

조립재가 흙의 역학적 성질에 미치는 영향 (Effect of Coarse mateflal on the mechanical properties of Soil)

  • 윤충섭;김호일
    • 한국농공학회지
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    • 제31권3호
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    • pp.57-69
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    • 1989
  • The study was carried out for the strength parameter of coarse grained Soil and slope stability analysis of earth dam. The test samples were taken fifteen kinds of soil from cohesive soil to coarse gravel. The degree of compaction of test samples for shear test and permeability test was chosen 95 percentage of maximum dry density. The results of this study are as follows ; 1.The maximum dry density(Yd) of coarse grained soil increase in proportion to coarse particles(P) with the relation of Y d= 1.609+0.0043P. 2.The coefficients of permeability(k) decrease by the increase of fine particles(n) with the relation of k=0.0426e-0 185n. 3.The cohesions of soil decrease by the increase of coarse particles, but internal friction angles are more increased in same condition. 4.The internal friction angles(${\Phi}$) decrease in inverse proportion to void ratio(e) with the relation of ${\Phi}$ = 73.068 - 69.268e. 5.The strength parameters( Ct ${\Phi}$t) by triaxial compression test are clearly smaller than that (Cd, ${\Phi}$d) by direct shear test in fine grained soil, but the differences between both parameters are a little in coarse grained soil.The relations of both parameters are as follows; Ct = O.544Cd + 0.04 ${\Phi}$t= 1.282${\Phi}$d-2306 6.In cohesive soil, the strength parameters( Cl ${\Phi}$l) by large size shear test apparatus are similar to the strength parameters(Cs , ${\Phi}$s) by small size shear test appratus, but Cs and ${\Phi}$s values are larger than Cl and ${\Phi}$l values from 10 percentage to 20 percentage in coarse grained soil. 7.The fine grained soil is inappropriate to high dam more than 20 meters and it must be taken coarse grained soil with high internal friction angle for high dam.

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Evaluation of unsaturated soil slope stability by incorporating soil-water characteristic curve

  • Zhai, Qian;Tian, Gang;Ye, Weimin;Rahardjo, Harianto;Dai, Guoliang;Wang, Shijun
    • Geomechanics and Engineering
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    • 제28권6호
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    • pp.637-644
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    • 2022
  • Loess soils are unsaturated and widely distributed in the northwest zone in China. Many steep slope of unsaturated are observed are observed to be naturally stable. However, a low factor of safety (FoS) for these slopes would be computed from the slope stability analysis following local code practices. It seems that the analyzed results following the local code practices do not agree with the real condition as observed in the field. It is commonly known that soil suction plays an important role in slope stability due to a higher shear strength of the unsaturated soil as compared with that of the saturated soil. In this paper, it is observed that the computed FoS can also be affected by unsaturated unit weight of the soil. However, the effect of unsaturated unit weight of the soil on the slope stability is commonly ignored in engineering practice. Therefore, both the effects of shear strength and unit weight of the unsaturated soil on the computed FoS of unsaturated soil slope are investigated in this study. It is observed that the unsaturated unit weight of soil on the computed FoS increases with increase in slope angle. It is also observed that the effects of the unsaturated shear strength and unsaturated unit weight on the computed FoS are more significant than the effect of 3D analyses compared to the 2D analyses on the FoS.

Effect of water distribution on shear strength of compacted loess

  • Kang-ze, Yuan;Wan-kui, Ni;Xiang-fei, Lu;Hai-man, Wang
    • Geomechanics and Engineering
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    • 제31권5호
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    • pp.519-527
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    • 2022
  • Shear failure in soil is the primary cause of most geotechnical structure failures or instability. Soil water content is a significant factor affecting soil shear strength. In this study, the shear strength of samples with different water contents was tested. The shear strength, cohesion, and internal friction angle decreased with increasing water content. Based on the variation of cohesion and internal friction angle, the water content zone was divided into a high-water content zone and low-water content zone with a threshold water content of 15.05%. Cohesion and internal friction angle have a good linear relationship with water content in both zones. Environmental Scanning Electron Microscopy (ESEM) test presented that the aggregates size of the compacted loess gradually increases with increasing water content. Meanwhile, the clay in the compacted loess forms a matric that envelops around the surface of the aggregates and fills the inter-aggregates pores. A quantitative analysis of bound water and free water under different water contents using a nuclear magnetic resonance (NMR) test was carried out. The threshold water content between bound water and free water was slightly below the plastic limit, which is consistent with the results of shear strength parameters. Combined with the T2 distributions obtained by NMR, one can define a T2 relaxation time of 1.58 ms as the boundary point for bound water distribution without free water. Finally, the effects of bound water and free water on shear strength parameters were analyzed using linear regression analysis.