Abstract

High-pressure water jet cutting technology is an important aspect of the application of water jet technology, which has been applied in many engineering fields. Due to the superposition of many complex relationships, such as dynamic changes of soil, water jet and interaction between fluid and soil, the internal mechanism and real physical process of high pressure water jet cutting hard soil have not been accurately revealed. The influence of submerged water jet angle on cutting characteristics of hard soil is studied by experimental method. The results show that the cutting depth decreases with the increase of moving speed at different angles, and the cutting depth reaches the maximum at 90°jet angle, while the cutting depth decays fastest with moving speed at 90°jet angle. When the jet angle is 30°, due to the small contact angle between the water jet and the hard soil, the phenomenon of "skin warping" appears, and the width direction is difficult to define. With the increase of the cutting angle, the cutting depth gradually increases, and the hard soil has obvious texture characteristics after breaking the soil. The cutting depth increases almost linearly with the increase of angle, but the maximum point of cutting area appears at the angle of 45°. If the depth is pursued, it is more reasonable to choose the incident angle of 90°, but the cutting area directly affects the output, so it is more reasonable to choose 45°as the construction angle. After cutting the texture fault, the pit structure appears in the lowest area of the mud block, which is because the water flow concentration in a very short time aggravates the destruction of the soil, so the pit structure appears. This achievement has certain reference significance for studying the construction technology of high-pressure water jet on TSHD(Trailing Suction Hopper Dredger).

Introduction

High-pressure water jet cutting technology is an important part of the application of water jet technology, which has been applied in many engineering fields (Sun, 1992, Li 1997, Shen, 1998). In dredging projects, for example, high-pressure jet can be used to assist dredging operations of trailing suction hopper dredger, pre-cutting hard clay and improving the cutting efficiency of drag head teeth. Due to the superposition of various complex relationships such as soil dynamic changes, water jet impact load changes and fluid-solid interaction (Tian, 2003, Arnold, 2013), the related numerical simulation and experimental research are more difficult. The failure to accurately reveal the inherent mechanism and real physical process of high-pressure water jet cutting hard soil largely affects the development and application to dredge engineering.

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