000004890 001__ 4890
000004890 005__ 20141119144602.0
000004890 04107 $$aeng
000004890 046__ $$k2002-06-02
000004890 100__ $$aZeng, Xiangwu
000004890 24500 $$aMEASUREMENT OF BASE AND SUBGRADE LAYER STIFFNESS USING BENDER ELEMENT TECHNIQUE

000004890 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference
000004890 260__ $$bColumbia University in the City of New York
000004890 506__ $$arestricted
000004890 520__ $$2eng$$aBase and subgrade soil stiffnesses are important parameters for material characterization in highway construction. During and after pavement construction, it is very important and cost-effective to have a reliable technique that can measure the stiffness of in-situ base and subgrade layers accurately and quickly. The new highway design guide proposed by AASHTO requires such measurement be conducted. A new field-testing technique has been developed to measure small-strain shear modulus of soils (which can be converted into elastic modulus) using the bender element technique. The device used in this method includes a pair of cone penetrometers, each fitted with two bender elements, which can be pushed into the base, subbase and subgrade layers. A pulse generated by a function generator is used to activate the transmitters. Vibration of the transmitters produces shear waves that propagate through the soil in the horizontal and inclined directions and are captured by the receivers. Then from the measured shear wave velocities, soil stiffness can be determined. The technique is compared with current practice of soil stiffness determination based on the CBR test.

000004890 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004890 653__ $$aBender element, CBR test, shear wave velocity, stiffness

000004890 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002
000004890 720__ $$aZeng, Xiangwu$$iFigueroa, J. Ludwig$$iFu, Lei
000004890 8560_ $$ffischerc@itam.cas.cz
000004890 8564_ $$s101703$$uhttp://invenio.itam.cas.cz/record/4890/files/496.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004890 962__ $$r4594
000004890 980__ $$aPAPER