The shear strength and stability of a soil mass containing dispersed large particles

2004 ◽  
pp. 697-700
Author(s):  
Luis Vallejo ◽  
Rebecca Sass ◽  
Rachel Craig ◽  
Sebastian Lobo-Guerrero
Keyword(s):  
Shear Strength ◽  
Soil Mass ◽  
Large Particles

scholarly journals Mechanical Properties and Micro Mechanism of Nano-Clay-Modified Soil Cement Reinforced by Recycled Sand

2021 ◽  
Vol 13 (14) ◽  
pp. 7758
Author(s):  
Biao Qian ◽  
Wenjie Yu ◽  
Beifeng Lv ◽  
Haibo Kang ◽  
Longxin Shu ◽  
...  
Keyword(s):  
Shear Strength ◽  
Void Ratio ◽  
Soil Mass ◽  
Direct Shear ◽  
Test Results ◽  
The Sustainable Development ◽  
Direct Shear Tests ◽  
Soil Cement ◽  
Nano Clay ◽  
New Material

To observe the effect of recycled sand and nano-clay on the improvement of the early strength of soil-cement (7d), 0%, 10%, 15% and 20% recycled sand were added. While maintaining a fixed moisture content of 30%, the ratios of each material are specified in terms of soil mass percentage. The shear strength of CSR (recycled sand blended soil-cement) was investigated by direct shear test and four groups of specimens (CSR-1, CSR-2, CSR-3 and CSR-4) were obtained. In addition, 8% nano-clay was added to four CSR groups to obtain the four groups of CSRN-1, CSRN-2, CSRN-3 and CSRN-4 (soil-cement mixed with recycled sand and nano-clay), which were also subjected to direct shear tests. A detailed analysis of the modification mechanism of soil-cement by recycled sand and nano-clay was carried out in combination with scanning electron microscopy (SEM) and IPP (ImagePro-Plus) software. The test results showed that: (1) CSR-3 has the highest shear strength due to the “concrete-like” effect of the incorporation of recycled sand. With the addition of 8% nano-clay, the overall shear strength of the cement was improved, with CSRN-2 having the best shear strength, thanks to the filling effect of the nano-clay and its high volcanic ash content. (2) When recycled sand and nano-clay were added to soil-cement, the improvement in shear strength was manifested in a more reasonable macroscopic internal structure distribution of soil-cement. (3) SEM test results showed that the shear strength was negatively correlated with the void ratio of its microstructure. The smaller the void ratio, the greater the shear strength. This shows that the use of reclaimed sand can improve the sustainable development of the environment, and at the same time, the new material of nano-clay has potential application value.

The 1994 landslide at Sainte-Monique, Quebec: geotechnical investigation and application of progressive failure analysis

2015 ◽  
Vol 52 (4) ◽  
pp. 490-504 ◽  
Author(s):  
A. Locat ◽  
S. Leroueil ◽  
A. Fortin ◽  
D. Demers ◽  
H.P. Jostad
Keyword(s):  
Shear Strength ◽  
Failure Analysis ◽  
Progressive Failure ◽  
High Sensitivity ◽  
Failure Surface ◽  
Soil Mass ◽  
Silty Clay ◽  
High Plasticity ◽  
Geotechnical Investigation ◽  
Progressive Failure Analysis

In 1994, a landslide occurred in the municipality of Sainte-Monique, Quebec. The debris of the landslide had graben and host shapes, typical of spreads in sensitive clays. The geotechnical investigation shows that the soil involved is a firm to stiff, sensitive, nearly normally consolidated grey silty clay of high plasticity. This soil exhibits a high sensitivity and a high brittleness during shear and is therefore susceptible to progressive failure. Traditional stability analysis cannot explain this landslide. This gives the opportunity to examine the applicability of progressive failure analysis to this spread. Using the finite elements method, it is demonstrated that the initiation and observed extent of the failure surface are explained by a soil having high brittleness during shear and a large-deformation shear strength close to the remoulded shear strength of the soil. The dislocation of the soil mass can also be explained by the active failure occurring in the soil mass above the failure surface during or shortly after failure propagation. It is therefore numerically demonstrated that progressive failure explains the initiation and the extent of the failure surface of this spread.

scholarly journals Improving Shear Strength Parameters of Sandy Soil using Enzyme-Mediated Calcite Precipitation Technique

2018 ◽  
Vol 20 (2) ◽  
pp. 91 ◽  
Author(s):  
Heriansyah Putra ◽  
Hideaki Yasuhara ◽  
Naoki Kinoshita ◽  
Erizal . ◽  
Tri Sudibyo
Keyword(s):  
Shear Strength ◽  
Sandy Soil ◽  
Friction Angle ◽  
Soil Improvement ◽  
Soil Mass ◽  
Shear Strength Parameters ◽  
Calcite Precipitation ◽  
Strength Parameters ◽  
Direct Shear Tests ◽  
Potential Applications

Several methods have been established for their various potential applications as soil improvement technique, and recently the application of grouting technique using biological process have been proposed. This study discussed the applicability of enzyme-mediated calcite precipitation (EMCP) in improving the shear strength parameters of sandy soil.  In this study, soil specimens were prepared and treated with the grouting solutions composed of urea, calcium chloride, magnesium sulfate and enzyme of urease. Evolutions in the cohesion and internal friction angle of the improved soil were examined through the direct shear tests. The presence of the precipitated materials, comprising 4.1 percent of the soil mass of the treated sand, generated a cohesion of 53 kPa. However, contrary to the improvement of cohesion, the friction angle is relatively constant. It indicated that the application of the EMCP technique has no significant impact on the friction angle

scholarly journals ANALISIS EFEKTIVITAS PENGGUNAAN MICROPILE SEBAGAI ELEMEN PERKUATAN STABILITAS LERENG

2020 ◽  
Vol 3 (1) ◽  
pp. 109
Author(s):  
Farrell Arman ◽  
Chaidir Anwar Makarim
Keyword(s):  
Shear Strength ◽  
Carrying Capacity ◽  
Low Cost ◽  
Limit Equilibrium ◽  
Retaining Wall ◽  
Small Diameter ◽  
Soil Mass ◽  
Common Problems ◽  
Effective Reinforcement ◽  
Manual Calculation

Landslide is one of the most common problems in the geotechnical field, especially in Indonesia. Landslide can occur due to increased shear stress of a soil mass or decreased shear strength of a soil mass that can happen overtime or in an instant. In other words, the shear strength of a soil mass is not able to withstand the load of the soil mass on top of it because the soil is unstable. To solve the problem of landslides, a proper and effective reinforcement is needed. Micropile is one of the ways that can be used as slope reinforcement, it can retain the soil mass on a higher location so the slope won’t collapse on its own. Micropile can be used as a retaining wall, it is quite easy to be applied on the field, it has a small diameter, and a relatively low cost. The compressive strength of the micropile is used to withstand the soil mass on a higher location. In this analysis, the carrying capacity of the micropile will be analyzed by manual calculation. The carrying capacity of the micropile will then be reanalyzed with the help of the limit equilibrium method software. The result at the end of this process is the safety factor of the simulated slope. This analysis is done twice, one is the simulation of a slope that is reinforced by micropile, and the other is not reinforced with micropile. The final result of both calculations will be compared to one another. This analysis will then result in the effectiveness of micropile as an element to maintain slope stability.AbstrakKelongsoran tanah pada lereng merupakan salah satu permasalahan yang paling sering terjadi di dalam dunia geoteknik, terutama di Indonesia. Kelongsorsan dapat terjadi akibat meningkatnya tegangan geser suatu massa tanah atau menurunnya kekuatan geser suatu massa tanah. Dengan kata lain, kekuatan geser dari suatu massa tanah tidak mampu memikul beban yang terdapat di atasnya karena kondisi tanah tidak stabil. Untuk mengatasi masalah kelongsoran pada lereng, diperlukan perkuatan yang tepat dan efektif. Micropile merupakan salah satu jenis perkuatan yang dapat membantu menahan massa tanah di lokasi yang lebih tinggi pada suatu lereng, karena micropile dapat dimanfaatkan sebagai dinding penahan tanah, mudah diaplikasikan, memiliki ukuran yang kecil, dan biaya yang relatif murah. Kapasitas micropile yang berguna untuk menahan massa tanah di lokasi yang lebih tinggi adalah kapasitas micropile untuk menahan tekan. Pada analisis ini, perhitungan kapasitas micropile akan dianalisa dengan perhitungan manual. Nilai kapasitas micropile kemudian akan diolah kembali dengan bantuan program metode kesetimbangan batas, sehingga didapatkan nilai faktor keamanan dari lereng yang telah didesain. Hasil pengolahan data dari analisis stabilitas lereng dengan micropile ini nantinya akan dibandingkan dengan hasil pengolahan data dari analisis stabilitas lereng tanpa micropile. Analisis ini akan menghasilkan efektivitas micropile sebagai elemen perkuatan stabilitas lereng.

scholarly journals PEMBELAJARAN KUAT GESER DAN KUAT TEKAN PADA TANAH LEMPUNG BERBASIS PRAKTIKUM

2017 ◽  
Vol 3 (2) ◽  
Author(s):  
Suhairiani . ◽  
Nahesson H Panjaitan ◽  
Hamidun Batubara
Keyword(s):  
Compressive Strength ◽  
Shear Strength ◽  
Soil Mass ◽  
Internal Resistance ◽  
Resistance Force ◽  
Ability Test ◽  
Cognitive Improvement ◽  
The Subject ◽  
Strongly Agree ◽  
Student Observation

Kekuatan geser dan kuat tekan tanah adalah ilmu gaya perlawanan internal yang bekerja per satuan massa tanah untuk menahan keruntuhan sepanjang bidang yang runtuh dalam periode tanah dimana perlu diketahui kekuatan kekuatan geser dan kekuatan tekan pada tanah liat Namun, banyak siswa belum selesai mempelajarinya. Berbagai upaya dalam meningkatkan penguasaan materi, yaitu melalui metode praktis yang dirancang oleh mahasiswa untuk mengembangkan dan meningkatkan aktivitas belajar dalam memahami materi pelajaran dan keterampilan dasar untuk meningkatkan kemampuan eksperimental, terutama dengan menggunakan alat. Jenis penelitian yang digunakan adalah penelitian eksperimental dengan metode kuantitatif dengan desain penelitian kelompok pretest dan posttest. Instrumen yang digunakan adalah tes kemampuan kognitif, lembar observasi siswa dan dosen dan kuesioner. Hasil penelitian menunjukkan bahwa peningkatan kognitif mahasiswa sebesar 84.24% dan peningkatan psikomotor mahasiswa dengan kriteria sangat baik adalah 57,68% dan rata-rata respon mahasiswa sangat setuju dengan penerapan pembelajaran berbasis praktek. sekitar 88%. Sehingga penerapan pembelajaran berbasis praktikum dapat digunakan untuk berbagai jenis kasus pertanahan yang ada terutama untuk pengujian yang berkaitan dengan kekuatan geser dan kuat tekan pada tanah liat Kata Kunci : tanah liat, kekuatan tekan, kekuatan geser, praktikum  ABSTRACT The shear strength and compressive strength of the soil is the science of the internal resistance force acting per unit of soil mass to withstand collapse along the crumbling plane in the soil period for which it is necessary to know the strength of shear strength and compressive strength on the clay soil. However, many students have not finished in studying it. Various efforts in improving the mastery of the material, namely through practical methods designed by students to develop and improve learning activities in understanding the subject matter and basic skills to improve experimental skills, especially using tools. The type of research used is experimental research with quantitative method with pretest and posttest group research design. The instruments used are cognitive ability test, student observation sheet and lecturer and questionnaire. The results showed that students' cognitive improvement of 83.79% and psychomotor improvement of students with a very good criterion was 57.68% and the average response of students strongly agree with the application of practice-based learning. about 88%. So that the application of practicum-based learning can be used for various types of land cases that exist especially for testing related to shear strength and compressive strength on clay. Keywords: clay, compressive strength, practicum, shear strength

Shear Strength of Soils

2015 ◽  
pp. 249-312
Keyword(s):  
Shear Strength ◽  
Bearing Capacity ◽  
Continuum Mechanics ◽  
Geotechnical Engineering ◽  
Soil Mass ◽  
Physico Chemical ◽  
Soil Deposits ◽  
Intrinsic Capacity ◽  
The Stability ◽  
Multi Phase

Shear strength is a very important property of soils. The concept is used by geotechnical engineers in estimating the bearing capacity of foundations and in assessing the stability of retaining walls, slopes, and embankments and the design and construction of highway and airfield pavements. The shear strength of a soil can be regarded as its intrinsic capacity to resist failure when forces act on the soil mass. The strength is a function of the type as well as the physico-chemical make-up of the soil. This chapter explores the strength theories that are used in geotechnical engineering and which derive essentially from the classical theories of elasticity and plasticity. Such theories are usually modified when used by soil engineers in recognition of the discrete and multi-phase nature of soil deposits. It is important therefore to understand some of the fundamental concepts or hypothesis of continuum mechanics to be able to appreciate the limitations and applicability of strength theories in geotechnical engineering.

Method to Evaluate the Shear Strength of Granular Material with Large Particles

2010 ◽  
Author(s):  
Hu Wei ◽  
Etienne Frossard ◽  
Pierre-Yves Hicher ◽  
Christophe Dano
Keyword(s):  
Shear Strength ◽  
Granular Material ◽  
Large Particles

The Relation between Moisture Content and Share Strength of Swelling Soft Rock in the North of Xianfeng Town Open-Cast Coal

2014 ◽  
Vol 971-973 ◽  
pp. 2168-2171
Author(s):  
Qing Shui Liu ◽  
Ying Hui Chen ◽  
Wen Lian Liu
Keyword(s):  
Shear Strength ◽  
Moisture Content ◽  
Soft Rock ◽  
Soil Mass ◽  
Soaking Time ◽  
The North ◽  
Disturbed Soil ◽  
Strength Tests ◽  
The Stability ◽  
Open Cast

We did sorts of shear strength tests in different moisture content conditions with amount of disturbed soil which was collected from the swelling soft rock in the north of xianfeng town open-cast coal. Furthermore, we analyzed the physical relationships between moisture content of the rock-soil mass and shear strength under different soaking time or different moisture content conditions. Finally, we find the shear strength of rock-soil mass drops along with the saturated degree of test specimen doubled and re-doubled. We get a conclusion that soaking of the rock-soil mass has a strong influence on the strength of rock-soil mass. The soaking of groundwater and surface water could soft the rock-soil mass, which plays an important role in controlling the stability of side slope, also in continuing slip deformation.

scholarly journals Contribution of Tea Root Reinforcement to Soil Shear Strength on Slope Stability

2018 ◽  
Vol 4 (1) ◽  
pp. 13
Author(s):  
Mukhsin Abubakar
Keyword(s):  
Shear Strength ◽  
Slope Stability ◽  
Tensile Stress ◽  
Soil Condition ◽  
Soil Mass ◽  
Root Diameter ◽  
Root Reinforcement ◽  
Root Branching ◽  
Soil Shear Strength ◽  
Diameter Differentiation

Roots played important role in the process of stabilizing the soil mass. The geo-mechanical and soil-hydrological aspects on the slope are determined by, one of it, the root reinforcement. The role of root branching series with diameter differentiation is greatly determining its tensile stress. The tensile stress from the interaction between the root and the soil, could it contribute to increasing the shear strength of the slope stability. The purpose of this research was to identify the tensile stress on root branching series that interacted with the soil and created additional cohesion as a shear strength contribution to the slope stability. Testing on the root pulling force was conducted on slope prototype with angle 30o to 40o and has been planted with tea vegetation. A tripod that was completed with strain gauge as the recording instrument was used. Testing was conducted on two and three root branching, also on each unit by observing the diameter. This testing method was done in saturated soil condition. The tensile stress result showed that increasing diameter of the tea root, an increase was noticed, and also result in the equation of TFr = 0.089e0.516d. Root diameter increase on two and three root branching to one unit of tea vegetation showed that the stress increase was significant. When observed, in the root diameter differentiation of 4 mm to 6 mm, the stress on two and three root branching and one unit of tea vegetation were respectively 5.94%, 12.30%, and 35.42%. The contribution of additional cohesion caused by root-soil interaction to soil shear strength apparently could increase slope stability.

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