Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing
Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing
Doctoral DissertationMonotonic and Dynamic Strength Characteristics of Discontinuous Plane in Ring Shearing(y >& ỈÝ 6 obyNguyen Van IlaiDivision of Sy Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing ystem Design and Engineering Graduate School of Science and Engineering Yamaguchi University, Japan coMarch, 2017ABSTRACTThis thesis represents a laboratory-based experimental study into the monotonic and dynamic strength characteristics of discontinuous plane in ring shearing. It is well-known (hat Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing the residual shear strength is an essential property in evaluating long-term stability of reactivated landslides in geotechnical engineering. AccordiMonotonic and dynamic strength characteristics of discontinuous plane in ring shearing
ng to previous studies, earthquake-induced landslides may occur on discontinuous planes, such as bedding planes between weathered and un-wcalhcrcd mudDoctoral DissertationMonotonic and Dynamic Strength Characteristics of Discontinuous Plane in Ring Shearing(y >& ỈÝ 6 obyNguyen Van IlaiDivision of Sy Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing n cemented and non-ccmcnlcd soil layers has not yet been sufficiently investigated. The objective of this study is to elucidate the ring-shear characteristics of artificial bedding planes that model actual behaviors of slip surfaces occurring between two layers having different degrees of cementatio Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing n. Additionally, in order to simulate realistic mechanical behavior of naturally cemented clay, artificial cementation bonds were created by adding aMonotonic and dynamic strength characteristics of discontinuous plane in ring shearing
cementing agent al different ratios to clay slurry. A scries of monotonic and dynamic ringshear tests was performed under various conditions on non-ccDoctoral DissertationMonotonic and Dynamic Strength Characteristics of Discontinuous Plane in Ring Shearing(y >& ỈÝ 6 obyNguyen Van IlaiDivision of Sy Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing s: A series of ring-shear tests was performed on reconstituted and cemented one-layer clay specimens, and on two-layered specimens made from clay layers having varied levels of cementation to artificially reproduce a bedding plane. Total nine types of sample were performed. The shear displacement ra Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing te, the normal stress, and the curing time were varied in order to better elucidate the influence of these factors on the residual strength characteriMonotonic and dynamic strength characteristics of discontinuous plane in ring shearing
stics of the discontinuous plane. The test results showed that the residual friction angle of two-part combinations of non-cemented and cemented kaoliDoctoral DissertationMonotonic and Dynamic Strength Characteristics of Discontinuous Plane in Ring Shearing(y >& ỈÝ 6 obyNguyen Van IlaiDivision of Sy Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing han non-cemented kaolin. The stress ratio of 2% cemented kaolin increased as the sheardisplacement rate increased. The degree of increase was not significant as the cement content increased beyond 2%.Furthermore, additional multistage ring-shear tests under different normal stresses and shear speeds Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing performed on four sample types showed that the residual friction angle was significantly different corresponding to types of sample, with a range ofMonotonic and dynamic strength characteristics of discontinuous plane in ring shearing
0.5 to 6.2°. Additionally, the effect of cementation on the residual cohesion intercept was identified according to the testing methodology. The stresDoctoral DissertationMonotonic and Dynamic Strength Characteristics of Discontinuous Plane in Ring Shearing(y >& ỈÝ 6 obyNguyen Van IlaiDivision of Sy Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing . This increase is different for 0% and 4% cemented kaolin, which indicates that the multistage technique may give erroneous results for these clayey soils.(2) Dynamic ring-shear lesls: Experimental tests were carried out by using a consolidation-constant volume cyclic loading ring-shear apparatus. Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing Three levels of vertical consolidation stress, ƠN, (98 kPa. 196 kPa. and 294 kPa); four overconsolidation ratios (OCR) (1. 2, 3. and 4); and three sheMonotonic and dynamic strength characteristics of discontinuous plane in ring shearing
ar-torque amplitudes (30 kPa. 60 kPa. and 90 kPa), were applied. The response of four types of samples of cemented and non-ecmcnlcd kaolin under aboveDoctoral DissertationMonotonic and Dynamic Strength Characteristics of Discontinuous Plane in Ring Shearing(y >& ỈÝ 6 obyNguyen Van IlaiDivision of Sy Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing . I. which evaluate the rale of cyclic degradation with the number of cycles, was mainly used to analyze test results. The experimental results revealed that / decreases with increasing ƠX. shear-torque amplitude, and OCR. For 2%+0% combined-cement specimen, the effect of c>\- on the cyclic degradat Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing ion was not significant. As OCR increased from I to 4. the value of t reduced approximately 25.7% and 58.6% for 0% and 2% normal cemented kaolin samplMonotonic and dynamic strength characteristics of discontinuous plane in ring shearing
es, respectively. On the other hand, positive and negative cyclic pore water pressure may be generated inside the 2% cemented specimen. This trend alsDoctoral DissertationMonotonic and Dynamic Strength Characteristics of Discontinuous Plane in Ring Shearing(y >& ỈÝ 6 obyNguyen Van IlaiDivision of Sy Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing ined specimens with a bedding plane, the stress paths barely reached their residual strength line. The cyclic shear resistance of discontinuous plane materials decreased significantly as compared with static residual strength.iiCONTENTSABSTR.XCT....................................................... Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing ..............iCONTENTS....................................................................iiiLIST OF FIGURES.........................................Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing
.....................viLIST OF TABLES.............................................................xiiiLISI OF SYMBOLS AND ABBREVIATIONS...............Doctoral DissertationMonotonic and Dynamic Strength Characteristics of Discontinuous Plane in Ring Shearing(y >& ỈÝ 6 obyNguyen Van IlaiDivision of Sy Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing .................................11.2Objectives and Scopes...................................................6I 3Organization of thesis..................................................7Chapter 2l.l 1'F.RA HIRE REVIEW............................................102.1Residual strength behavior of clay Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing s....................................102.1.1Introduction.........................................................102.1.2Relationship between residualMonotonic and dynamic strength characteristics of discontinuous plane in ring shearing
strength with soil index properties....122.1.3Nonlinearity of residual failure envelope............................192.1.4Residual shearing mechanism.Doctoral DissertationMonotonic and Dynamic Strength Characteristics of Discontinuous Plane in Ring Shearing(y >& ỈÝ 6 obyNguyen Van IlaiDivision of Sy Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing f clays and its application to the evaluation of landslidesstability..................................................................262.2Characteristics of naturally cemented clay.............................302.3Residual strength characteristics of cementedclay soils...............33 Monotonic and dynamic strength characteristics of discontinuous plane in ring shearing Doctoral DissertationMonotonic and Dynamic Strength Characteristics of Discontinuous Plane in Ring Shearing(y >& ỈÝ 6 obyNguyen Van IlaiDivision of SyGọi ngay
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