Cutter suction dredgers are important pieces of rock excavation equipment in port and waterway construction. It is valuable but difficult to properly estimate the cutting force on the chisel pick of the cutter suction dredger. In this paper, an analytical model, called the crushed zone expansion induced tensile failure model (CEIT model), is proposed for rock cutting with a chisel pick in order to predict the peak cutting force (Fc) more accurately. First, a review of the existing models for rock cutting with a chisel pick is presented. Next, based on the tensile breakage theory, cavity expansion theory and some hypotheses, the mathematical formula of the CEIT model is obtained. Different from that in the previous models, the effect of the rock on both sides of the chisel pick on Fc, defined as the sidewall effect is considered in the CEIT model. Then, the predicted Fc by the CEIT model is compared with the predicted Fc by existing theoretical models and experimental results to check the validity of the CEIT model. The results show that the CEIT model can well capture the relationships of Fc to the cutting parameters, including cutting width, cutting depth, and rake angle, and can predict the experimental results much better than the existing models. Finally, the sidewall effect and its influence factors according to the CEIT model are discussed.

中文翻译：

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凿吸式挖泥船凿凿的岩石切割解析模型

绞吸式挖泥船是港口和水路建设中岩石开挖设备的重要组成部分。这很有价值，但是很难正确估计切割机吸泥船的凿子上的切割力。在本文中，提出了一种称为碎裂区扩展引起的拉伸破坏模型（CEIT模型）的分析模型，用于用凿子截齿进行岩石切割，以便更准确地预测峰值切削力（Fc）。首先，介绍了现有的凿子凿岩模型。接下来，基于拉伸断裂理论，腔膨胀理论和一些假设，得出了CEIT模型的数学公式。与以前的模型不同，凿子两侧的岩石对Fc的影响CEIT模型中考虑了定义为侧壁效应的。然后，预测的Fc由CEIT模型与预测相比的Fc现有理论模型和实验结果，检查CEIT模型的有效性。结果表明，CEIT模型可以很好地捕捉Fc与切削参数的关系，包括切削宽度，切削深度和前角，并且可以比现有模型更好地预测实验结果。最后，根据CEIT模型讨论了侧壁效应及其影响因素。