We mainly carried out the research through the following three aspects: First, the dam structure was identified by using the seismograph, the compactness of the dam foundation and the dam body was determined according to the wave velocity of the soil layer, and the construction quality of the dam foundation and the dam body was comprehensively evaluated. This study tries to find out the real reason for dam break from the physical and mechanical properties of the foundation and the dam. The dam break is a gradual development from piping to complete dam break. The study investigated the 2021 dam failure of the Yang village reservoir in Ningxia, China, which resulted in millions of dollars of property damage but no casualties. Therefore, it is of great significance to study the mechanical characteristics of loess in the saturated state for preventing dam break. Near-static liquefaction of the loess in the dam body under the saturated condition will lead to piping or loss of soil strength. Piping channels easily form under the action of force and collapsibility. The main reason may be that although the gradation of loess particle is not uniform. The construction of a reservoir on a large-thickness collapsible loess cover will significantly increase the occurrence of dam break disasters. 3Key Laboratory of Loess Earthquake Engineering, China Earthquake Administration and Gansu Province, Lanzhou, China.2Institute of Solid Mechanics, Ningxia University, Yinchuan, China.1School of Physics and Electronic-Electrical Engineering, Ningxia University, Yinchuan, China.These utility programs are fast, running in several seconds on a Harris-500 computer.Wenguo Ma 1,2, Gang Zhang 2*, Youzhen Yang 1,2, Ping Wang 3, Yishen Zhao 1,2 and Qingqing Lin 1,2 These programs also allow the user to make a DWOPER deck from a DAMBRK deck of vice-versa so that the individual capabilities of each NWS program are readily available for any study. In order to facilitate modeling with the National Weather Service (NWS) programs DWOPER (Operational Dynamic Wave Model) and DAMBRK (Dam-break) the author has written a series of utility programs which reformat and/or manipulate the data to allow much easier, faster and reliable editing. Time and computer resources greatly limit potential investigations and sensitivity anslyses. Burns, US Army Corps of Engineers, Baltimore, MD, USA,
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