沉入式新型桶式防波堤抗倾滑移定性计算

Computation method of anti-sliding stability of new bucket breakwater

作为一种轻型直壁式防波堤结构,在波浪荷载作用下,新型桶式防波堤抗滑移稳定性是这种桶式基础结构稳定性计算的重要部分,由于这种桶体结构的复杂性,规范中尚未提出针对这种新型结构的抗滑稳定性计算方法.假设沉入较深土层的桶式防波堤极限状态下的抗滑稳定性主要由桶壁土压力、桶底土剪力、桶土自重维持,桶与土体看作一个整体,其工作原理与重力式挡土墙类似,在波浪荷载作用下桶体绕转动中心转动,陆侧桶壁为被动区域,海侧桶壁为主动区域.假定极限状态下桶体两端顶部分别达到被动土压力状态、主动土压力状态,同时在桶体底部土体剪力也达到极限状态.基于上述假设,通过解析的方式,建立了考虑桶体转动影响的三维桶式防波堤抗滑稳定性计算方法.

For a light breakwater structure, the anti-sliding stability is an important part to calculate the stability of the new breakwater under the wave load. Due to the complexity of the structure, there isn＇t any stipulation yet on the computation method of the anti-sliding stability for this new breakwater structure. We assume that the stability of an embedded new bucket breakwater mainly depends on the soil pressure on the wall, the shear stress at the bottom of the bucket, and the self-weight of the bucket and the soil in the bucket. The bucket and the soil in it are regarded as an entirety. Such a breakwater works under a similar principle as a gravity retaining wall. Supposing that the bucket rotates around the rotating centre of the bucket, the soil on the wall of the harbor side is under passive state, and the soil on the wall of the sea side is under the active state. It supposes that the soil pressure on both ends of the bucket wall reaches the passive soil pressure state and active soil pressure state respectively under the ultimate state, and at the same time, the shear stress under the bucket also reaches its ultimate state. Based on the above-mentioned hypothesis, by means of derivation and analysis, the computation method of anti-sliding stability of 3 D embedded new bucket breakwater considering the influence of the rotation is established.