The Optimization Research On Joing Grouting Technical Standard In Summer In Yellow River Laxiwa Arch Dam

Laxiwa hydroelectric station's scale is large (1) scale and grade is I rank. The main construction includes barrage, underground powerhouse on right side, water diversion and release structures and so on. The barrage is logarithm spiral double-curvature thin arch dam. It has a maximum height of 250.00m, with a maximum base width of 49.00m at arch crown and a widest place of about 55.00 m at arch abutment.The bid document of Laxiwa hydroelectric station defines: it in principle cannot carry on the joint grouting construction from June to September every year. But according to present domestic associated project's experience analysis, the dam of Laxiwa starts to be placing from April 2006,and has the condition of water storage at August 2008. The time limit for it is extremely intense. If we adopte conventional technical standard for joint grouting construction, we are difficult to satisfy the construction progress. Therefore, the feasibility research of extending the period of joint grouting and the optimization technical standard, for construction progress management and realization water storage on schedule, all has the extremely important project significance.This article's main research content includes:1. Using simulation analysis method, according to existing control progresses of placing, grouting and so on and temperature control measures, it researches the variety of stress state in riverbed monolith in the situation of grouting whole year, discloses the question which is caused by grouting in summer.2. Using simulation analysis method, according to existing control progresses of placing, grouting and so on and temperature control measures, it researches the variety of stress state in abrupt slope monolith in the situation of grouting whole year, in particular the transverse joint intensity influence at abrupt slope.3. Using simulation analysis method, it researches the possibly consequence which is produced by placing without adopting special temperature control measures in grout compartment in summer, then carries on comparing the different temperature control cases, and recommending practical feasible project measure.This article adopts the following technical means:1. According to existing temperature control measures and control target of placing, grouting and so on, arranging placing and grouting ranks, it researches the variety of stress state in riverbed monolith in the situation of grouting whole year, grasps the character of thermal stress, which contributes to research grouting measures.2. Through different sensitive parameter's simulation computation, it researches the stress of dam in grout compartment in summer in different temperature control measures, which contributes to recommend feasible project measure.