Analysis On Internal Force Of Lock Chamber Of High Head Ship Lock

In recent years, the hydraulic structures of integral ship lock develop quickly, because they have strong adaptability to uneven settlement, good durability and eliminate the problem of sealing maintenance, which have a wide range of applications.So far, there were not too much reports in integral ship lock of high-head, especially in the impact on the structure of the high fill and elastic modulus of sluice foundation, so it is necessary to study on internal force of integral ship lock. This article aims to provide a wealth of information by using numerical simulation, give out the internal force of lock in details, and provide a scientific proof for studying high head integral ship lock and engineering design.The current analysis of internal force of ship-lock is based on the hypothesis of plan system, but it can not solve the problem of stereoscopy. With continuous improvement of the three-dimensional finite element technology, it was used very extensively in complex constructions. The current status and finite element basic theories of lock structure are presented in this paper, including three-dimensional solid finite element theory, nonlinear finite element theory.This paper takes a ship-lock in southwest for example, basing on the general software ANSYS10.0, to achieve nonlinear contact with APDL language, and makes an analysis by using three-dimensional numerical simulation. With the calculations of six load cases, different backfill elevation and elastic modulus of sluice, the results show that:1) When the lock chamber is in high water level , the midial of the bottom of lock wall is in a high state of tension, the upper floor is in tension; when the lock chamber is in low water level , the midial of the bottom of lock wall is at high pressure, the bottom of floor is in tension.2) The impact of internal force of backfill of high head integral ship lock is very sensitive. Changing the backfill elevation, the impact of vertical displacement and stress of lock chamber is not obvious, but the impact of horizontal displacement and stress of lock chamber is obvious, compared with the backfill elevation 380m, when the backfill elevation 395m, the displacement increases 300.4%, the stress increases 285.7%.The impact of basal stress is obvious, with the increment of backfill height, and the degree of uneven distribution of stress enhance, when the backfill elevation 380m, uniformity coefficient 1.27, when the backfill elevation 395m,uniformity coefficient 4.33.3)Elastic modulus of sluice foundation is also a sensitive factor that affects internal force. Changing the value of elastic modulus of sluice foundation, the impact of vertical displacement is obvious, and has a relationship of negative correlation, that is to say, the smaller of the value of elastic modulus, the greater of the value of vertical displacement, on the contrary the opposite. For the lock wall, compared with Ek =3.0e9 MPa, when Ek =2.4e9 MPa, the vertical displacement increases 21.8%; when Ek =3.6e9 MPa, the displacement reduces 14.6%. The elastic modulus of sluice foundation have a great impact on the stress of chamber floor, compared with Ek =3.0e9 MPa, when Ek =2.4e9 MPa, the tensile stress of the bottom of floor increases 26.7%, when Ek =3.6e9 MPa, the tensile stress reduces 17.3%, the smaller of the value of elastic modulus , the greater the horizontal stress of chamber floor increases, that is to say, the softer of foundation ,the greater the stress changes.The change of the value of elastic modulus of sluice foundation has a little impact on the phenomenon of uneven distribution of foundation stress .