Soil Mechanics and Foundation Engineering. Vol. 34, No. 3, 1997

RECONSTRUCTION AND CONSTRUCTION ON WEAK SOILS

R E I N F O R C E M E N T O F BEDS AND F O U N D A T I O N S D U R I N G T H E

R E C O N S T R U C T I O N O F B U I L D I N G S O N W E A K SOILS

P. A. Konovalov

After a certain standstill, the reconstruction and construction of buildings and structures in Russia (especially in

Moscow) is, in the literal sense, experiencing a boom. A large number of buildings, many of which exist under rather

complex geologic-engineering conditions, are undergoing restoration and reconstruction. As an example, it is possible to point

out work on the Great Kremlin Courtyard, the reconstruction of several structures of the Bolshoi Theater, the construction of

an underground garage and a new building for the former Moscow Council, the restoration of Christ the Savior Cathedral,

the reconstruction of the ancient Visitor's Courtyard, and construction of the commercial-recreational complex "Manezhnaya Mall" in the middle of an ancient historical development.

Of course, a set of problems, which had not previously arisen and, consequently, had not been worked out by

appropriate means, emerged in this case. It is known that, prior to 1993, studies associated with an increase in the bearing

capacity of beds and the reinforcement of foundations of buildings and structures were conducted, and Construction Rules and Regulations on reconstruction were prepared by the Scientific-Research Institute of Foundations and Underground Structures

and a number of the country's leading scientific-research and design institutes under the aegis of the State Committee of the USSR Council of Ministers for Construction Affairs. The staffs of the Scientific-Research Institute of Foundations and

Underground Structures, the State Institute for the Design and Planning of Beds and Foundations, the TsNIIOMTP, the Khar'kov PromstroiNIIProekt, and the Ukrspetsstroiproekt have already prepared a number of albums and recommendations. Further development of events (the demise of the USSR), however, has separated coexecutors throughout the various

countries of the Commonwealth of National Governments, and in the near future, we could hardly return to the compilation of analogous standards. That is why analysis of reconstruction problems is so timely.

In 1996, these problems were discussed at Gersevanov Lectures at the Scientific-Research Institute of Foundations and Underground Structures. At that time, however, the idea arose to prepare a special thematic issue of the journal "Soil Mechanics and Foundation Engineering." In the first phase, we have collected in the journal papers devoted to one of the most urgent problems (that of reinforcing beds and foundations during reconstruction.

The paper of Candidate of Technical Sciences A. P. Khamov is devoted to experimental investigations associated with the possibility of reinforcing beds by the injection of a clay-cement grout.

The paper by P. A. Konovalov and V. Ya. Shishkin discusses experience gained with the reinforcement of beds and foundations by pneumatic punches in the alluvial soils of Magnetogorsk.

The paper by V. M. Ulitskii and A. G. Shashkin generalizes experience gained with the reconstruction of buildings in Saint Petersburg.

In his paper, V. M. Margolin strives to correct basic technological and structural parameters in studying the stabiliza- tion of bed soils.

The paper by I. I. Broid and G. V. Mel'nik on the use of jet technology to eliminate suffosion cavities and areas of soil loosening is of major practical interest.

Specialists will receive a great deal of practical advice and recommendations from the paper by B. V. Bakholdin and

P. I. Yastrebov on the deficiencies of injected-in-place piles, and also from the paper presented by B. V. Bakholdin, E. M. Perlei, and E. V. Svetinskii on the reinforcement of the beds of buildings with driven piles.

Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 3, p. 2, May-June, 1997.

0038-0741/97/3403-0067518.00 �9 Plenum Publishing Corporation 67

The problem of reinforcing beds and foundations during the reconstruction of buildings is not resolved by these

articles. Periodically we will strive to satisfy growing interest in the discussion of this problem by accumulating material and

attracting a broader circle of specialists to the problem. The journal "Soil Mechanics and Foundation Engineering" may also

offer invaluable assistance here. We call upon scientists and specialists to prepare and submit to the editorial office material on procedures used to

restore waterproofing to foundations during the reconstruction of buildings; specifics on the reinforcement of foundations of

industrial buildings; and, characteristic features of the restoration of foundations of structures where chemicals are produced,

and other problems that arise during the reconstruction and restoration of buildings and structures.

It is deemed that this will be of interest to a broad circle of the journal's readers.

68