hm - 5940.3F erosion function apparatus (EFA) was designed and built to prevent bridge failures by measuring the erodibility of soil. 使用d in conjunction with the SRICOS scour prediction method, the HM-5940 can provide more accurate erodibility measurements and scour predictions than previously obtainable. Applications for its use include: scour at bridges, 水坝管道, beach erosion and surface erosion problems. In the case of scouring at bridge locations, the EFA leads to improved accuracy on scour depth predictions, offering several advantages over previous test methods. These advantages include: minimum sample disturbance; measurement of erosion rate vs. shear stress; measurement of critical shear stress, and incorporation of the test results from the SRICOS scour prediction method. The HM-4000 erosion function apparatus uses standard 3.0"外径x 2.875: ID (76.2 x 73毫米)谢尔比管. The SRICOS method improves the accuracy of pier scour predictions. hm - 5940 EFA is designed to be used in conjunction with the SRICOS method of scour prediction. The SRICOS scour prediction method and the HM-5940 erosion function apparatus were developed through research carried out by Jean-Louis Briaud, 博士学位, PE. and the scour research team at the Texas 运输ation Institute of the Texas A&M大学系统. In comparison with the HEC-18 equation (a standard for calculating scour predictions), SRICOS generally leads to smaller calculated scour depths and compares more favorably to actual measured scour depths.
- 7寸触摸屏界面
- Records and tabulates test data.
- Can store hundreds of tests at a time.
- 流量vs. time as well as water temperature vs. time
- System can automatically fill the water tank using water level sensors.
- System can automatically cycle between water sump and water fill during tests to maintain lower water temps.
- If hooked up the internet then the machine will auto update with available firmware updates.
- Test data can be exported to a USB stick for transfer to a PC with 洪堡's data download software available from the 洪堡 website.
- Motor can push the sample any specific distance customizable by the user.
The EFA uses either of two variants of the SRICOS method:
扩展的SRICOS方法
1) Calculate the maximum depth of scour.
2) Collect soil samples at the site.
3) Test samples in the EFA to obtain the erosion rate vs. the hydraulic shear stress applied.
4) Prepare the velocity hydrograph for the bridge.
5) 使用 the SRICOS program with 3 & 4 above as input and generate the depth of scour vs. time over the period covered by the chosen hydrograph.
简单SRICOS方法
1) Calculate the maximum depth of scour.
2) Collect soil samples at the site.
3) Test samples in the EFA to obtain the erosion rate vs. hydraulic shear stress applied.
4) Calculate the equivalent time for a given design life of the bridge and for the design velocity.
5) Using known equations, calculate the scour depth at the end of the design life.
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