E. A. Sorochan’s research while affiliated with Research Institute on the Foundations of Computer Science and other places

Work of inclined anchored foundation applied as restraining structure in mat-type technique to build up a slope is under investigation. Estimation scheme of ″inclined strip-anchorage-slope″ system and assumption on linear inherited creeping of base soils allows the system behaviour under construction and in operation of the building to be described as a set of integral and algebraic equations. A problem to find optimum tilt angle of the well for an anchor as well as corresponding maximum anchor cable tension is under solution. An example of such an estimation for an actually existing installation proves the feasibility to apply the foundation under consideration to build up a slope using mat-type technique.

This article investigates the operation of an inclined foundation with anchors used as the retaining component in a carpet-structural scheme for building on a slope. The calculation scheme for an "inclined strip-anchor-slope" system and a hypothesis about linear hereditary creep of base soils make it possible to describe the system's behavior in the process of construction and operation of a structure in the form of a system of integral and algebraic equations. The problem of finding the optimum slope of the anchor hole and the corresponding maximum tension of the anchor cable is solved. An example of such calculation for an actually existing object proves the possibility and economic efficiency of using the foundation under consideration for a carpet-structural scheme of building on a slope.

Continuous footing base stressed-strained state research results were discussed. The experiments carried out allowed to find optimal parameters of intermediate preparation: preparation rigid part width was lied within the limits of 0.4-0.6 of foundation depth. Calculations were carrying out with using application package RADUGA. It was shown that foundation use on the intermediate preparing enabled to reduce building set irregularity.

Without Abstract

Conclusions The purposed finite-element system makes it possible to analyze theoretically a whole class of problems associated with construction on slopes, to wit:1. To determine overall slope stability with allowance for the actual distribution of normal and tangential stresses along a fixed slip surface, and also the zones of adhesion, slip, and separation. 2. To investigate the variation in the stress-strain state of the soil mass contained in the slope with allowance for its stage construction, and also to study the formation and development of zones of the plastic flow of soil. 3. To determine the creep pressure on retaining anti-slide structures with consideration of the interaction between structures possessing actual stiffness, and the soil of the slope, and also the possible elastoplastic performance of the soil. 4. To determine the settlement and horizontal displacement of foundations of the structure being raised and the components of the anti-slide structures for different slope-construction schemes (terraced and structural-carpet).

Experimental investigations of the applicability of slotted foundations under seismic conditions have been conducted at the seismic proving ground operated by the Kishinev Division of the All-Union Scientific-Research Institute of Foundations and Underground Structures. The investigations were conducted at an experimental site, whose upper layer beneath a layer of topsoil consisted of a macroporous loesslike clayey soil. A layer of loess-like sandy loam lies below this to a depth of 8 m. Nine columnar foundations were prepared at the site; of these, eight were slotted and one had a flat lower surface. All foundations possessed a square planform. Slots 0.1 m wide were cut through to the required depth. During the experiments, the settlements of the foundations were determined under vertical static and lateral dynamic loads; in this case, as well as the influence exerted on the settlement by the depth of the slots foundation, the distance between the slots, the material of the slotted elements, and the presence of mud on the bottom of the slots. Additional study details and the study results are discussed.