Why Does Stepping Hard on The Accelerator in The Pebble Layer Only Make One Sink Deeper And Deeper

If the operators of rotary drilling RIGS encounter equipment subsidence during construction in pebble layers, they mustn't rush to step hard on the accelerator! This instinctive reaction not only fails to save the equipment, but may also make it sink deeper and deeper. Do you want to know the principle behind it? Here are the six major reasons for you.

1. Dispersed bearing capacity of the pebble layer: Unlike dense soil, the pebble layer has large gaps between particles and low friction. When the accelerator is pressed hard, the pressure applied by the equipment will cause the pebbles to roll and shift against each other, which instead reduces the overall support force and leads to a faster subsidence.

2. Excessive power leads to soil liquefaction: A sudden increase in power causes intense friction between the track and the pebble layer, resulting in vibration. This will cause the fine particles and water in the pebble layer to redistribute, similar to "soil liquefaction", destroying the original supporting structure and causing the equipment to sink deeper and deeper.

3. Reduced force-bearing area after sinking: After the equipment sinks, the actual contact area between the track and the pebble layer decreases. According to the pressure formula, when the force-receiving area decreases, the pressure per unit area increases, further intensifying the degree of subsidence and forming a vicious cycle.

4. Enhanced fluidity of the pebble layer: The impact force generated by stepping hard on the accelerator will make the originally relatively stable pebble layer more fluid. Just like quicksand, the greater the force applied by the equipment, the more likely the pebble layer is to "flow" and fail to provide effective support.

5. Damaging potential support structures: There may be small structures in the pebble layer that temporarily support the equipment. The vibration and thrust generated by stepping hard on the accelerator can damage these structures. The areas that could have been harnessed failed, causing the equipment to sink at an accelerated rate.

6. The power direction is counterproductive: When the accelerator is pressed hard, the power mainly acts downward and backward, while what we need is the upward support force and the forward traction force. The wrong direction of force makes it difficult for the equipment to get out of the predicament, and instead it sinks deeper and deeper.

So, when encountering a rotary drilling rig sinking in a pebble layer, it is not a wise move to step hard on the accelerator. After understanding these principles, the next time we encounter a similar situation, we can deal with it calmly, choose a more scientific way to get out of trouble, and prevent the equipment from falling into a worse situation.