绞吸船在软土地质下横移锚抓地力计算方法

大型绞吸船采用三角宽鳍锚作为横移挖掘的定位锚,针对横移锚在软土地质条件下锚抓力受限的问题,采用土体的极限平衡原理进行横移锚受力分析,建立三角宽鳍横移锚抓地力计算方法。经计算分析,在软土地质条件下,影响横移锚抓地力的主要因素为锚冠入土深度、土楔破坏角和锚杆角度。结果表明,锚冠入土越深,锚抓地力越大;锚杆与水平面夹角越小,锚抓地力越大;随土楔破坏角逐步增加,锚抓地力呈先减小、后变大的趋势;土楔破坏角在20°~25°时,横移锚抓地力最小,锚抓力系数为14左右。

Calculation method of sideway anchor grasping force of cutter suction dredger in soft soil

The cutter suction dredger uses a triangle broad fin anchor as the positioning anchor for sideway dredging. Aiming at the problem that the grasping force of the sideway anchor is limited under the soft soil,we carry out the force analysis of the sideway anchor by using the limit equilibrium principle of soil and establish the calculation method of the grasping force of the sideway anchor. Based on the calculation,the main factors affecting the grasping force of sideway anchor are the depth of anchor crown into the soil,the failure angle of soil wedge,and the angle of anchor rod. The results show that the deeper the anchor crown goes into the soil,the greater the anchor grasping force. The smaller the angle between the anchor rod and the horizontal plane,the greater the anchor grasping force. With the gradual increase of the failure angle of the soil wedge,the anchor grasping force first decreases and then increases. When the soil wedge failure angle is between 20° and 25°,the anchor grasping force is the smallest,and the anchor grasping force coefficient is about 14.