The article describes the conduct of field studies carried out during the overhaul of the cultural heritage object – the building of MBOU "Gymnasium No. 45" to establish rational parameters of injection of cement-sand mortar, the choice of the type and design of injectors and the scheme of drilling injection wells. It is proved that the technical solutions adopted in the soil fixing project are not optimal and do not provide the required quality of work. Recommendations on technological and constructive solutions for fixing soils have been developed and implemented in practice, taking into account engineering and geological conditions, the results of the survey and fixing at the pilot site.

Keywords: subsidence soil, foundation, cementation, injector, well drilling, geocomposite

The article presents the results of theoretical and experimental scientific research on the problem of monitoring the safety of a coal-mining region at the stage of closing unpromising mines. To achieve the goal of research - the formation of an effective methodology for this problem - the following main tasks have been solved: - assessment of the negative impact of mining operations on the technosphere of the region; - selection of the basic characteristics of the natural-technogenic system; - comparative analysis of methods and technical and technological systems for environmental control. The authors of the article formulated the concept of a safe region and the hypothesis of its implementation. In particular, scientific and methodological approaches have been developed that provide an objective assessment of the results of research and the adoption of managerial decisions on the formation of a safe environment for the life of the population. The article shows that the effectiveness of the developed methodology in specific conditions is 85-90%.

Keywords: coal mining region, liquidation of mines, coal rock massif, methodology, natural-technogenic system, safety concept, proactive monitoring

The results of a study of the effect of hardening the roof of workings of small length, of arbitrary shape, with a cross section of up to 80 m2, with advanced anchoring, which can significantly reduce the displacement of soil outcrops, are presented. The analysis shows that it is not possible to completely eliminate soil fallouts; therefore, a complex of studies of a stress-strain (SSD) soil mass, reinforced with a protective screen, was carried out. Finite element modeling (FEM) has established that advanced anchoring up to 15 m long does not work effectively, since the anchors are located in the zone of soil slippage. Increasing the length of the protective screen anchors to support their ends outside the sliding prism makes it possible to increase the stability of soil outcrops in the face.

Keywords: underground construction, stresses, displacements, hardening, anchoring, modeling, finite element method

The aim of the research was to develop a combined lining that would ensure long-term operation of underground workings in the chemical attack and high pressure groundwater. The problem of protection of groundwater is of particular importance for the mountain enterprises engaged in production of potash. Over the past 100 years in the world (Germany, Canada, Russia, and others.) Were flooded, more than 80 potash mines, including in Russia - mines BKRU-3 (1986) and BKRU-1 (2006) Verkhnekamskoye occurrence. The most commonly used lining of iron tubing does not provide the desired water resistance and durability. Disadvantages of steel lining supports identified based on the analysis of the experience of their application in Russia and abroad. The authors proposed a combination lining which consists of several layers of concrete or reinforced concrete and a waterproof layer of fiberglass. High strength, resistance to aggressive environments, the ability to provide complete waterproofing under relatively high cost of determining the benefits of the proposed lining. Calculations have shown that under certain conditions, the proposed construction of lining can effectively replace expensive cast-iron lining and steel lining.

Keywords: mining, combined lining, fiberglass, concrete, iron tubing, steel lining

Expressed need for a new approach to the development of underground space. The main task of complex monitoring at various stages of the life cycle of the underground facility. The description of the measuring stations to monitor the efforts of roof bolting

Keywords: Underground space development, monitoring, vertical shaft, anchor

The most promising technologies of concrete and reinforced concrete for the underground construction and transport. The studies with the inclusion of concrete and steel and polypropylene fibers. The factors affecting the strength and modulus of deformation materials. The conclusion about the need to study the effectiveness of the concrete with a combined reinforcement.

Keywords: Concrete and underground construction, fiber, strength, modulus of deformation