Rock Excavation By Chemical Method In Mumbai




Rock Excavation By Chemical Method
Silent – Fast – Economical – Convenient
Rock excavation shall be defined as the excavation of all hard, compacted or cemented materials that require blasting or the use of ripping and excavating equipment larger than defined for common excavation.

Mix the chemical with the normal water in topper proportion.
Fill the Mix chemical in depth of 2.5m c/c 300mm each.
After filling of chemical in hole, within 4 hours crack will occur on rock.
Break the rock by Rock Breaker Machine and loaded into the dumper by bucket and dispose outside the site premises.
There is no vibration at the time of minor cracks developont rock. So, no any type of damage will be occuriong, in nearest standing structure and tunnel.
There is no any kind of NOC require in this method
It is cheap and fastest method compare of diamond cutter method
Its allow to construct concreting work during the rock breaking method.
It’s easy to handle manually as well as via transportation.
It is noiseless
There is no any type of disadvantages in this method.

Rock excavation by chemical methods involves using chemical agents to break down or weaken the rock, making it easier to remove or extract. This technique is typically employed in situations where traditional mechanical methods, such as drilling and blasting, might not be feasible or safe due to factors like the presence of sensitive structures, noise restrictions, or environmental concerns. Here are a few common chemical methods used for rock excavation:

  1. Expansive Grouts: Expansive grouts, also known as expansive demolition agents or expansive cements, are chemical compounds that expand when mixed with water and injected into boreholes drilled into the rock. As they expand, they create pressure within the borehole, causing the rock to crack and break apart. This method is often used for controlled rock splitting and is effective in confined spaces or areas where vibration and noise must be minimized.
  2. Thermal Cracking: This method involves introducing a high-temperature source, such as a flame, into pre-drilled holes in the rock. The intense heat causes the rock to expand rapidly, and when the heat source is removed, the sudden cooling causes the rock to contract and crack. Repeated cycles of heating and cooling can lead to significant fracturing of the rock.
  3. Hydraulic Fracturing (Hydrofracturing): Hydrofracturing involves injecting a pressurized fluid, usually water, into boreholes drilled into the rock. The high pressure of the fluid causes fractures to propagate through the rock, eventually leading to its fragmentation. This method is commonly used for enhancing the permeability of underground formations, such as for geothermal energy extraction or oil and gas reservoir stimulation.
  4. Chemical Wedging: Chemical wedges are substances that are injected into pre-drilled holes in the rock. These substances expand over time due to chemical reactions, generating high internal pressures and causing the rock to fracture along predetermined lines.
  5. Acid Leaching: Acid leaching involves the use of strong acids to dissolve minerals and weaken the rock’s structure. This technique is often used in mining to extract valuable minerals from ores embedded in rock formations.
  6. Electrical Disintegration: This method uses electrically induced stresses to break down rocks. Electrodes are placed in boreholes drilled into the rock, and an electric current is passed through the rock, causing thermal expansion and stress-induced fracturing.

It’s important to note that the effectiveness of these methods can vary based on the type of rock, its mineral composition, and the specific conditions of the site. Additionally, safety considerations and environmental impacts must be carefully evaluated before employing any chemical method for rock excavation. Consulting with experts in geology, engineering, and environmental science is crucial when deciding which method to use and how to implement it safely and effectively.

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