ABSTRACT
The main problems which appeared during the construction were the absence of the experience in the construction of such types of buildings
1 INTRODUCTION
The development of the modern City is not possible without the development of underground space. But the construction conditions in St. Petersburg are much more complicated than in any other region of the country. Mainly this is explained by specific geological conditionsthe central part of the City is located on weak, water saturated thixotropic soil, which change their properties depending on the effect of different forces-natural and technogenic. Most of the buildings which were constructed in 18-19 centuries or beginning and middle of 20-th century have cracks and damages of the bearing structures and require the reinforcement of their base and foundations (Mangushev, 2004).
