Driven piles are the basis of reliable deep foundations broadly used for various types of buildin... more Driven piles are the basis of reliable deep foundations broadly used for various types of buildings and structures. Static load tests are conducted to ascertain correct results of static analyses, but static load tests are expensive and timeconsuming procedures. Therefore, dynamic methods have become popular techniques for evaluation of the ultimate pile capacity. The results of dynamic methods strongly depend on hammer energy and soil conditions. Analyses of numerous case histories show good, bad and critical determination of pile capacity by dynamic methods. Verification of dynamic pile testing with a static load test does not always guarantee the pile's ability to withstand design loads. It is not reasonable to connect pile testing at any construction site with determination of the ultimate pile capacity because the major goal of pile testing at sites is verification of the pile capability to withstand design loads. It is necessary to verify experimentally the pile capacity to withstand the design load with an appropriate factor of safety and check the applicability of signal-matching software for specified sites. Dynamic methods provide a sensible and beneficial approach to verification of the pile capacity necessary for withstanding design loads applied to piles.
High strain dynamic pile testing is widely spread in the pile driving industry. Evaluation of pil... more High strain dynamic pile testing is widely spread in the pile driving industry. Evaluation of pile capacity from field testing is the primary application of the dynamic method, but the accuracy and the area of utilization (soil conditions and pile type) of this method are vague. The application of hardware and software is only partially established because different hardware and software produce substantially diverse pile capacities. Engineering evaluation of pile capacity is not established at all. Statistical analysis of pile capacities is unable to find out applicability of the method to specified site conditions. Uncertainties are available in signal matching technique and comparison of the results of static and dynamic tests. Quality of dynamic measurements together with the software features and the engineering factors affect pile capacity obtained by dynamic testing. Engineering research is needed to ascertain the accuracy and the area of application of high strain dynamic pile testing.
Proceedings of SPIE - The International Society for Optical Engineering
Thtipaper deals with application of the wave equation to pile driving analysis. It is shown that ... more Thtipaper deals with application of the wave equation to pile driving analysis. It is shown that changes of the pile-soil system related to soil remolding around pile should be taken into account for reliable prediction ofpile capacity after the end of initial driving. Soil damping is the basic parameter for adjustment of wave equation solution with timedependent soil properties. Experimental data was acquired for three piles, one in clay and two in sand. Adjusted wave equation solutions yield an increase of soil damping with elapsed time after the end of driving with laker intensity in clay. A linear relationship between the skin damping coef&ient and time elapsed after driving was approximately found for piles in clay and sand. NOMENCLATURE J, : Skin damping coefficient J Skin damping coefficient at EOID se J sr : Skin damping coefficient at RSTR
Proceedings of SPIE - The International Society for Optical Engineering
A method is presented for obtaining a pre-construction estimation of the natural frequencies of d... more A method is presented for obtaining a pre-construction estimation of the natural frequencies of damped vertical vibrations of foundations which will be built at a specific site for machines with dynamic loads.
Experimental investigations of identical foundations on different bases were carried out at the e... more Experimental investigations of identical foundations on different bases were carried out at the experimental grounds at Kremenehug to select a rational base under foundations of low-frequency machines in type-I stump-prone loess soils.
Driven piles are the basis of reliable deep foundations broadly used for various types of buildin... more Driven piles are the basis of reliable deep foundations broadly used for various types of buildings and structures. Static load tests are conducted to ascertain correct results of static analyses, but static load tests are expensive and timeconsuming procedures. Therefore, dynamic methods have become popular techniques for evaluation of the ultimate pile capacity. The results of dynamic methods strongly depend on hammer energy and soil conditions. Analyses of numerous case histories show good, bad and critical determination of pile capacity by dynamic methods. Verification of dynamic pile testing with a static load test does not always guarantee the pile's ability to withstand design loads. It is not reasonable to connect pile testing at any construction site with determination of the ultimate pile capacity because the major goal of pile testing at sites is verification of the pile capability to withstand design loads. It is necessary to verify experimentally the pile capacity to withstand the design load with an appropriate factor of safety and check the applicability of signal-matching software for specified sites. Dynamic methods provide a sensible and beneficial approach to verification of the pile capacity necessary for withstanding design loads applied to piles.
High strain dynamic pile testing is widely spread in the pile driving industry. Evaluation of pil... more High strain dynamic pile testing is widely spread in the pile driving industry. Evaluation of pile capacity from field testing is the primary application of the dynamic method, but the accuracy and the area of utilization (soil conditions and pile type) of this method are vague. The application of hardware and software is only partially established because different hardware and software produce substantially diverse pile capacities. Engineering evaluation of pile capacity is not established at all. Statistical analysis of pile capacities is unable to find out applicability of the method to specified site conditions. Uncertainties are available in signal matching technique and comparison of the results of static and dynamic tests. Quality of dynamic measurements together with the software features and the engineering factors affect pile capacity obtained by dynamic testing. Engineering research is needed to ascertain the accuracy and the area of application of high strain dynamic pile testing.
Proceedings of SPIE - The International Society for Optical Engineering
Thtipaper deals with application of the wave equation to pile driving analysis. It is shown that ... more Thtipaper deals with application of the wave equation to pile driving analysis. It is shown that changes of the pile-soil system related to soil remolding around pile should be taken into account for reliable prediction ofpile capacity after the end of initial driving. Soil damping is the basic parameter for adjustment of wave equation solution with timedependent soil properties. Experimental data was acquired for three piles, one in clay and two in sand. Adjusted wave equation solutions yield an increase of soil damping with elapsed time after the end of driving with laker intensity in clay. A linear relationship between the skin damping coef&ient and time elapsed after driving was approximately found for piles in clay and sand. NOMENCLATURE J, : Skin damping coefficient J Skin damping coefficient at EOID se J sr : Skin damping coefficient at RSTR
Proceedings of SPIE - The International Society for Optical Engineering
A method is presented for obtaining a pre-construction estimation of the natural frequencies of d... more A method is presented for obtaining a pre-construction estimation of the natural frequencies of damped vertical vibrations of foundations which will be built at a specific site for machines with dynamic loads.
Experimental investigations of identical foundations on different bases were carried out at the e... more Experimental investigations of identical foundations on different bases were carried out at the experimental grounds at Kremenehug to select a rational base under foundations of low-frequency machines in type-I stump-prone loess soils.
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Papers by Mark R Svinkin