Analysis of maintenance geotechnologies and monitoring
of sewer tunnels in complicated geotechnical engineering conditions

Summary

A comprehensive approach to the selection of geotechnologies for the reconstruction of long sections of sewer tunnels in complicated ground conditions, under technogenic impact and continuous transportation of effluents is described. Based on the analysis of operating long-running sewer tunnels, as well as the results of an instrumental examination of their technical condition, the main factors of technogenic and natural origin that reduce their design safety and sustainable operation of the most loaded sections of the system of sewer tunnels are described. The lack of data on this issue in the regulatory framework and technical literature is noted. The advantages and disadvantages of the applied technologies of sewer tunnel rehabilitation are given. Recommendations and requirements to the rehabilitation of tunnels are proposed depending on the ground conditions, wear rate, section length, dynamics of wastewater transportation.

Key words

operational environment , sewer tunnel , complicated ground conditions , design safety , maintenance geotechnologies , modeling and geomonitoring

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Evaluation of the measuring conditions of water meters in the water supply system of St. Petersburg Vodokanal PUE

Summary

The basic parameters of the water flow that affect the results of water flow rate and volume measurements, i.e. fluid aeration, fluctuation of the measured flow rate under actual conditions, deposit formation on the inner surface of the water pipelines etc. are considered. Experimental investigations of the said parameters were carried out; the ways of reducing their effect on the results of measuring water flow rate and volume are suggested. The principal condition of the normal operation of measurement instrumentation should be the adjustment of all the parameters listed in the technical documentation (but not limited to those in the instruction manual) to the operational environment.

Key words

operational environment , water flow parameters , multistaging, transiency , non stationarity , deposits on the inner surface of the water pipelines , validity of the measurement results