Danutė Sližytė

Influence of the pile stiffness on the ground slab behaviour

AbstractJust as other structural elements, ground slabs are an important unit of a building. It is especially true in the case of buildings, such as logistic centres, for which the primary purpose is storage of various goods. In this kind of buildings, floor slabs usually have high loads. For buildings where truck lifts are used, there are special requirements for flatness tolerance across and along the driving track of truck lifts. Therefore, the floor settlement differences in selected distances are limited. In localities where the soils under the floor slab are weak, they should be replaced or compacted. If these solutions are not possible or economically inappropriate, the slabs have to be supported on piles that must be based on strong deep soils. During the design process, it is very important to assign a proper value of rigidity of the piles. Pile stiffness has an enormous influence on the settlement of the slab as well as on the reinforcement intensity of the slab or even on the slab thickness. Th...

Analysis of static and dynamic deformation modulus

AbstractThis article summarises dynamic deformation modulus correlation with second reload of static plate load test results for an even thickness soil strata layer. An analysis of execution and result interpretation of both static deformation modulus and dynamic deformation modulus is provided also. Different correlations between the two modulus according to different authors are provided. Since dynamic plate load test is not regulated in Lithuania as a soil compaction contron method, a few dynamic plate load tests and static plate load tests were executed in order to compare compaction results. The additional experiments for dynamic plate load tests in different depths were executed which showed that deformation modulus is dependant on depth of test execution, thus it is worthwile to mention to be cautious on compaction results in trenches.

Research of cement additives influence on the properties of soilcrete

AbstractThe article analyses a possibility of replacing a part of cement with fly ash in jet grouting piles, because the received strength of cement treated grout is much higher than it is necessary for these piles. The paper presents the problems of fly ash utilization, overviews experimental and theoretical works and analyses laboratory tests on the samples of cement treated grout. The conducted experiments involved manufacturing cylindrical cement treated grout samples containing different additives when the diameter of the cylinder is 35 mm, and its height is 70 mm. The experiments on the samples comprising the additives of fly ash were made in sand and clay soils. 25% to 75% of cement was replaced with fly ash in cement treated grout samples tested under compressive strength following 7 days hardening in air.

Kai kurios rekonstruojamų pastatų pamatų pagilinimo iškasomis problemos ir jų sprendimo metodai

Santrauka Renovuojant senus pastatus, labai dažnai tenka gilinti pamatus. Tai daroma dėl kelių priežascių: pirma, kai norima rūsio patalpas pritaikyti veiklai. Kadangi rūsio patalpų aukstis būna per mažas, tenka aukstinti patalpas; antra, kai pastato sienos dėl nuosėdžių yra supleisėjusios ir būtina stiprinti pamatus; trecia, dėl padidėjusių apkrovų, renovuojant pastatus. Atsižvelgiant į sias priežastis, pasirenkamas būdas, kuriuo keiciama pamato konstrukcija. Dažnai taikomas pamatų pado gilinimo iskasomis būdas. Siuo atveju būtina spresti tokius klausimus: iskasų gylį ir plotį; atstumą tarp vienu metu daromų iskasų; papildomų pamatų nuosėdžių dydį ir poveikį pastato konstrukcijoms; būdus, mažinancius nevienodų nuosėdžių pasekmes. Iskasa keicia slėgio pasiskirstymą po pamatu, todėl iskasos gylis ir plotis turi būti apskaiciuotas įvertinant slėgio didėjimą po renovuojamu pamatu. Gilinant pamatus neisvengiami papildomi pamatų nuosėdžiai. Spartinant pamato pado gilinimo procesą iskasomis efektyvu daryti inje...