000			04040nas|a2200445 i 4500
005			20260817172339.0
008			021122s2002 th u m rtt 00| a1eng d
035			_a.b11870746
099		9	_aAIT Thesis no. GE-01-09
100	1		_aNawagamuwa, Udeni P.
245	1	0	_aCavity expansion analysis on cone penetration resistance of sand compaction piles
260			_aBangkok : _bAsian Institute of Technology, _c2002
300			_a95 leaves
490	1		_aThesis ; _vno. GE-01-09
500			_aA thesis submitted in partial fulfillment of the requirements for the Degree of Master of Engineering, School of Engineering and Technology
502			_aThesis (M.Eng.) - Asian Institute of Technology, 2002
520			_aStrength parameters of a sand compaction pile are normally checked by standard penetration test (SPT). Empirical equations, which are derived from numerous data obtained from uniform sand, are adopted for evaluating internal friction angle (z') value of the sand pile. However, constraint conditions of a sand pile in the clay improved with sand column piles (SCPs) are considered to be very different from that in the uniform sand. Due to simplicity, speed, continuous profiling and amenability to theoretical modeling, cone penetration tests (CPT) can be used to evaluate z' for SCP. In this research study laboratory tests were done with a miniature cone, which consisted of two gauges to measure tip resistance and probe resistance, inserted into a sample of saturated sand in a triaxial set-up. Before inserting the cone the sample was consolidated under different confining pressures such as 50, 100, 200 and 400 kPa and then the cone was penetrated at a constant rate to find out the ultimate cavity expansion pressure and the volume change of the sample. These tests were done with two different relative densities of 60% and 72% Toyoura sand. A theory, based on cavity expansion, was developed for computing the cone penetration resistance of sand. The sand was modeled as an elastic-plastic material with a plastic zone and an elastic zone in the SCP and considering the spring action given by the surrounding clay to transfer the confining stresses to the SCP. This theory was used for analysis of calibration chamber tests, as it takes full account of SCP size and boundary conditions. In addition, a parametric study was done to observe the behavior of SCP for different input parameters. The agreement between Vesic theory and the theory developed using cavity expansion for infinite soil mass was 100%. Some differences were observed in the laboratory test results with respect to the cavity expansion theoretical results. A good linear relationship was observed between the ultimate cavity pressure and the internal friction angle using the developed theory.
650	1	0	_aCone
650	1	0	_aSand
650	1	0	_aClay soils
650	1	0	_aClay _xAnalysis
700	1		_aTakemura, Jiro, _eChairperson
700	1		_aBergado, Dennes T., _eExamination Committee
700	1		_aPark, Kyung Ho, _eExamination Committee
710	2		_aThe Government of Japan, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. GE-01-09
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B07871
907			_a.b11870746 _bmnait _cu
902			_a240403
998			_b0 _c021122 _dm _ea _fu _g0
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