Wave propagation in porous media, shock tube experiments

56A 842132

for angular sands of much smaller particle ~Lzes

Characteristics of soils at cyclic and shock loads Ivanov, P L. Simtsm, A P. Musaelyan, A A Proc lOth International Conference on Soil Mechanics and Foundation Engineering, Stockholm, 15-19 June 1981 V3, P239-242 Publ Rotterdam A A Balkema, 1981 It is shown that the shape of soil particles has influence on the compaction and strength of sandy sods A solution to a dynamic problem of the two-layer foundation stress state due to the action of a falling load is presented The features of slumping strain formation in loess sods under dynamic actions is then considered 842133

Wave propagation in porous media, shock tube experiments Van der Kogel, H, Van Loon-Engels, C H, Ruygrok, P A Proc lOth International Conference on Soil Meclumics and

Foundation Engineering, Stockholm, 15-19 Jane 1981 V3,

842137 Settlement and pore pressure due to cyclic loading Schwab, H H Proc lOth International Conference on Soil Mechanics and Foundation Engineering, Stockholm, 15-19 June 1981 1'3 P293-298 Publ Rotterdam A A Balkema 1981 The cychc trlayaal test as well as the cychc simple shear test wtth lateral confinement are usually used to investigate the behavlour of soils subjected to cyclic acting loads In many cases these testing procedures are insufficient to be used as a base for estimating deformations occurnng far away from the liquefied stage A testing equipment ~s presented which ~s well suited for testing soil and rockfill material under controlled stattc acting horizontal and vertical stresses superimposed by cyclic stresses The behavlour of the soils was investigated after removal of the cycling acting load

P253-256 Publ Rotterdam A A Balkema. 1981 In order to get more insight into the propagation of pore pressure during transient loading a hmlted shock tube study has been performed Pore pressure and total pressure recordings due to shock loading of a 'sand pile" have been obtained. Three cases are considered the dry, the unsaturated and the 'almost" saturated case The emerging 'two-wave' form and the trends towards the saturated case are in agreement with the established theoretical results 842134 Cyclic and transient loading on sandy soils (in French) Luong, M P, Sldaner, J F Proc lOth International Conference on Soil Mechanics and

Foundation Engineering, Stockholm, 15-19 June 1981 V3, P257-260 Publ Rotterdam A A Balkema, 1981 The study of the rheologlcal behaviour of sandy soils in a cychc trmxml apparatus has shown the importance of the irreversible volumetric deformation generated under cychc and transient loading A new concept, the characteristic state, determined using convenuonal tnaxial tests, allows the definmon of a range of stable behavlour for coheslonless sods under cyclic loading, associated with contraction of the material It allows the interpretation of cyclic loading of softs m both drained and undrained condmons

842135 Behaviour of clay on cyclic stress-strain history Matsul, T, Abe, N Proc lOth International Conference on Soil Mechanics and

Foundation Engineering, Stockholm, 15-19 June 1981 V3, P261-264 Publ Rotterdam A A Balkema, 1981 A reliable measuring techmque of the cychc pore pressure of saturated clay is developed by inserting a small transducer within a maxial specimen A method to estimate the cumulated cyclic pore pressure of saturated clay is established which is also apphcable for cyclic loadmgs of random amplitude The undrained strength and deformation characteristics of saturated clay after cyclic loading ~s examined by comparing cyclic stressstrata and overconsohdat~on histories

842136 Resonant column testing of railroad ballast Prange, B Proc lOth International Conference on Soil Meclumics and

Foundation Engineering, Stockholm, 15-19 June 1981 V3, P273-278 Publ Rotterdam A A Balkema, 1981 Large scale resonant column tests were carried out on ballast material with large particle sizes (max 70mm) Results show good agreement with values obtained using empmcal formulae

842138

Saturated sands under cyclic loading Wang, W S Proc lOth International Conference on Soil Mechanics and Foundation Engineering, Stockholm, 15-19 June 19,81 l' 3. P323-326 Publ Rotterdam A A Balkema. 1981 The problem of strength, liquefaction and failure of saturated sands has always been greatly concerned m dealing with the safety of foundations of hydraulic structures and earth or earthrock dams against earthquake action The theory of hm~t eqmhbnum is adopted as a cntenon m evaluataon of the recipient failure state of saturated sands under cyclic loading, and the corresponding laboratory tests and analytical methods are suggested The difference between liquefaction and mopmnt failure is clarified. Two types of approach are proposed for evaluation of pore water pressure changes induced by cyclic loading, m one of which their dispersion and dissipation behavtour is taken into account Auth 842139

Dynamic behavior of rock Dints Gillette, D R, Sture, S, Hon-Yim Ko, Gould, M C, Scott. G A Proc 24th US Symposimn on Rock Mechanics, College Station, Texas, 20-23 Jane 1983 P163-179 Publ AEG, 1983 Dynamic direct shear experiments were conducted on fresh artificial rock joint specimens under drained and undramexi condmons The shear strain, shear displacement and joint water pressure response behaviour was monitored dunng numerous load cycles The tests were carried out at frequencies ranging from 0 to 10Hz and normal stresses ranging from 69 to 3,448kPa Imtialjomt water pressures ranged from 0 to 690kPa It was found that the strength of dry rock joints is velocity dependent, and that significant joint water pressure changes take place dunng undrained cychc loading leading to a state of nearly zero effective stress Auth

Classification and identification 842140 Appraising the moisture condition test for obtaining the Casngrande dasailication of soils Ewan, V J, West, G Tra~port and Road Research Laboratory supplementary report SR786, 1983, lOP The moisture condlUon test was devlsext to rapidly quantify the moisture condition of soils to assess the smtabdity of materials in relation to speofied upper limits ofmoisture content The test results are reported m terms of the moisture condition value (MCV) which may be correlated to undrained shear strength