CAJ | 학술논문

海底管线的稳定性是海底管线研究的重要内容之一。通过有限元软件ABAQUS，应用Mohr-Coulomb塑性模型，模拟海底管线自沉过程。通过进行海床土体初始地应力平衡、设置管土接触的方法，建立海底管土相互作用模型，分别计算了管线在自重和波流载荷联合作用下的管线变形及土体沉降量。计算结果显示，管线自重和波流载荷对管线的弯曲变形影响较大，对土体沉降量影响较小。同时通过对比模拟研究，发现管线水下重量、外径，土体粘聚力、内摩擦角都对土体沉降量有不同程度的影响，影响的大小程度取决于土体是否进入塑性屈服状态，参数的改变使土体越容易发生塑性屈服，土体的沉降量越大。
해저관선적은정성시해저관선연구적중요내용지일。통과유한원연건ABAQUS，응용Mohr-Coulomb소성모형，모의해저관선자침과정。통과진행해상토체초시지응력평형、설치관토접촉적방법，건립해저관토상호작용모형，분별계산료관선재자중화파류재하연합작용하적관선변형급토체침강량。계산결과현시，관선자중화파류재하대관선적만곡변형영향교대，대토체침강량영향교소。동시통과대비모의연구，발현관선수하중량、외경，토체점취력、내마찰각도대토체침강량유불동정도적영향，영향적대소정도취결우토체시부진입소성굴복상태，삼수적개변사토체월용역발생소성굴복，토체적침강량월대。
The stability of submarine pipeline is one of the important content in the research of the submarine pipeline. Through finite element software ABAQUS, the Mohr-Coulomb plastic model was established to simulate the pipeline sinking process. Through balancing the soil in-situ stress, setting the pipe-soil contact model, to build a submarine pipe-soil interac-tion model to calculate the deformation and force condition of embedded pipeline under the load of gravity and the combined load of weight and harmonic wave and current force respectively. The calculation results show, pipeline deadweight and wave and current force have great impact on the bending deformation of pipe and the soil settlement. At the same time, by compar-ing the simulation research, we found that underwater pipeline weight, diameter, soil cohesion, internal friction angle have different effects on the soil settlement, the size of the effect depends on the degree of soil into the plastic state, parameter changes to make the soil more prone to plastic yield, the soil settlement is more bigger.