Drainage system and pressure reduction measures are usually adopted to treat the uplift of anti-seepage structure of water transfer project caused by long route and varying groundwater table.Check valve-drainage system in which reverse check valve plays a key role nakes one of the best choice for its one-way flow performance.Existing reverse check valves have an inflexible opening and shutoff process,a poor long term performance,a meticulous construction operation,and must be accurately installed in a certain direction.To solve these problems,a novel reverse check valve based on differential pressure amplification is researched and developed in consideration of application conditions.The principle of opening and shutoff is improved;and new shutoff type and anti-clogging method are put forward.Opening and shutoff of the new check valve is only driven by amplified differential water pressure,and no other external force is needed,thus,it can be installed in every direction.Differential pressure amplification components and arc close structure are developed to improve the reliability and flexibility of opening and shutoff.Anti-clogging structure is designed and anti-fatigue problem is considered to ensure the long-term performance.The new reverse check valve can be widely used in the drainage system of canal,slope protection of dike and river course,groundwater table change belt of dam,water conveyance tunnel and other water-involving structures.

The confirmatory test region plays an important role in the Kunming new airport to confirm the compactness and engineering properties of backfilling materials such as red clay, Douposi heavily weathered material and Douposi weak-middlely weathered material by vibration and dynamic consolidation method(DCM). Test results show that (1)the density of red clay is no less than 93.0% after compaction, which is satisfied with the requirement of design.(2)the density of Douposi heavily weathered material is no less than 93.0% after compaction, which is satisfied with the requirement of design.(3) the heavy dynamic penetration test of Douposi heavily weathered material shows that the blow count of embankment with depth between 3.0m ~7.0m is higher than that one of embankment with depth between 0.0m ~3.0m. According to the compactness test, the density of Douposi heavily weathered material embankment is no less than 93.0% when the blow count of heavy dynamic penetration is above 5.8.(4) on the condition of the DCM construction of main tamp with 1 time and inter-grid of different construction layers along depth, the density of lower layer of embankment is increased obviously, and the density of upper layer of embankment is also increased when the DCM construction is continued. It is suggested that after the DCM construction of main tamp with 1 time is completed, the DCM in the lower energy level and full tamp with 1 time or the bumping vibration compaction is adopted, the density of Douposi heavily weathered material embankment will be increased.(5)there is the same result and the suggestion for Douposi weak-middlely weathered material embankment. The test result can be provided as the reference for the consolidation of karst funnel in Kunming new airport and similar engineering.

The different treatments, such as the sleeve valve grouting method and the high pressure grouting with sleeve valve grouting method is adopted according to the concealed cavity in Kunming new airport. Test results show that: (1) after treatment, the equivalent shearing wave velocity of whole soil layer of NO.GR1 is higher and the physical property of foundation is improved than before, meanwhile although a great deal of concrete are used in the engineering, there is only a little cement paste found between 2.2m~18.0m during the core-drilling test, which means the test is not successful. (2) The shearing velocity of improved layer is higher in NO.GR2, the shearing velocity of other layers is lower than before treatment, which means the high pressure grouting with sleeve valve grouting method is feasible method to treat the concealed karst cavity.

This paper introduces the basic principle and influence factors of compaction test,and carries out compaction test study on red clay of Kunming new airport.For red clay,dry and wet compaction test have different methods for sample preparation and have larger difference in the maximum dry density,i.e.absolute average difference of 0.070 g/cm3 and relative difference of 4.5 %.In addition,the absolute average differencein the optimum water content is 4.2 % and relative difference is 9.7 %.The maximum dry density and the optimum water content of red clay should be measured according to indoor compaction test or three-point compaction test on site construction soil sample.If lacking of site test result,23.0 % is suggested as the optimum water content and 1.610 g/cm3 is suggested as the maximum dry density.

Lufang Water Conservancy Project is a small project in scale,but it contains all items of hydraulic engineering. For implementing the objective of high quality project,the project supervision station followed the related technical standard and various supervision specifications, employed all reasonablly possible measures reconciled various relationships and avoided to the cantracts to make the engineering progress, quality and investment under effective control. The supervision task was fully accomplished, and the project has been put into operation on time.

简要地介绍了广州市中旅商业城基坑支护及周边建筑物安全监测的成果.中旅商业城基坑挖深达19 m,采用综合支护体系,在基坑周边布置了表面和内部观测仪器,观测了水平位移、沉降、地下水位、锚力等,观测成果表明:基坑的工作状态良好,各监测项目资料规律性较好,基坑边壁及周边土体的最大水平位移为8～28mm,小于设计指标,水平位移速度最大为0.6mm/d,且很快收敛.基坑和周边建筑物是稳定安全的.