The dam of the Kirovskoe reservoir was constructed in 1971-1975 on the Talas River. The main purpose of the reservoir is for irrigation; its total volume is 550 million m ~, the useful volume 540 million m s. The reservoir was created by a concrete buttress dam, A dam of such type was constructed for the first time in the USSR. The height of the dam is 84 m, crest length 260 m, slope of the upstream and downstream faces 0~With respect to design, the Kirovskoe dam was divided into three zones dependlnE on the working conditions of the concrete in the operating period and was constructed by the "Toktogul" method with the use of sectlonalizatlon into concreting blocks. The widths of the concreting blocks varied from 22 m (head) to 12 m (buttress); the length reached 77 m.Two grades of concrete were used: 25 MPa R18 V-8 Mrz200 (279,000 m ~) and 20 MPa RI6 V-6 Mrz150 (50,000 ms). Concrete grade 20 MPa was placed in the buttresses and downstream heads of the sections.Cements of various grades from different cement plants were used in the initial period of constructin E the dam. Beginning in April 1972 only low-heat sulfate-resistant portland cement grade 300 was used. This simplified the selection and correction of the concrete compositions and promoted an increase of the homogeneit7 of its properties. The cement met all requirements of the technical specifications for cement for constructing the dam of the Kirovskoe reservoir. It main properties were sufficienLly stable, which is characterized by comparatively low coefficients of variation of aotivit~ (C V of compressive strength, 6.1%; Cvof beindinE tensile strength, 12.3Z), specific surface (CV ffi 8.7), and content of alkalies (Cv = 14.0%).

In Oct. 1975, concrete work was completed on the Kirovsk reservoir dam. The dam is located on the Talas River south of DzhamtmL The 550-million-mSreservoir is intended to irrigate land in the Kirgiz SSR and in Kazakh. start. The climate in the region iscontinental with extreme average-daily temperatures ranging from-35 to + 35~ and an average-annual temperature of %4~The massive-buttress concrete dam is 84 m high and 260 m long at the crest and has a volume of 310,000 m a (Figs. 1 and 2) and a triangular shape with the upstream and downstream faces sloped at 0.45. The lower section of the downstream face has a greater slope (m = 0.70). A massive gravity dam constructed on the same site would have had a concrete volume of 348,000 m a. The buttress dam adopted has 12.2% less concrete, representing a savings of 1,244,000 rabies in this case.The dam is divided by expansion-settlement joints into sections 22 m wide; the buttresses are 12 m thick. A fiIIet-headwall 5 m thick was constructed against the downstream face of the buttresses to insuIate the recesses between them from the atmosphere. Cutoffs 7 and 4 m deep were constructed beneath the upstream and downstream headwalls.Two outlet works with a 3 x 4-m intake section and a discharge section 2.2 m in diameter, which were lined with metal 16 mm thick, were called for in the body of the dam. The cylindrical discharge section of the outlet works is equipped with a conical gate.A surface water intake having a spillway face of practical shape with a springboard lip is located in the channel section of the dam. Construction flows were passed through a 6.3 x g.a-m tunnel 370 m long.The foundation of the dam is blocks of sandstones and schists having a strike almost coincident with the a~is of the dam (Fig. 1). The angle of dip of the block is 25-85 ~ downstream, i.e., virtually coincident with the upstream face of the dam. The seepage from the bedrock does not exceed 0.3 m/day on the average, and the modulus of elasticity ranges from (1 to 2)-10 s kg/cm z. Along the edges of the watercourse, the rock foundation had weathered to a depth of 5-10 m. was covered with a layer of alluvium 6-14 m deep in the channel section, and exhibited good soundness.Following ks the set of antiseepage measures: a grout curtain 20-30 m deep below the upstream headwall along the entire front of the dam, which was constructed by the method of hole injection in three rows spaced 8.4 and 2 m apart; combination grouting at the point where the deep curtain joins the upstream cutoff (an average hole depth of 5-8 m); stabilization (site) grouting over the entire foundation (a hole spacing of 3 m along the sections; hole depths ranged from 10-20 m). Dam drainage consisted of the following elements: a drain curtain 20-25 m deep located behind the grout curtain; surface drainage under the buttresses running from the upstream headwaU to the axis of the dam; and drainage of the rock borders of the foundation pit. The overall volume of work devoted to grouting, stabilizauon, and drainage consisted of 24,...