Which method is primarily used to fill cracks, voids, and fissures in loose gravels and rocky strata?
Grouting
The question is asking about the method used to fill cracks, voids, and fissures in loose gravels and rocky strata. Let's analyze the options:
- Grouting: This is a process widely used in civil engineering to fill voids or cracks in a variety of structures, including soils and rocks. Grout is injected into the ground under pressure to consolidate incomplete structures, to cut off groundwater, or to fill voids and cavities. This method is primarily used in the scenario provided in the question—filling cracks, voids, and fissures in loose gravels and rocky strata.
- Cavity wall construction: This is a building method that uses hollow walls to create a thermal barrier. It is not primarily used for filling cracks or voids in loose gravels or rocky strata.
- Surface treatment: This generally refers to the application of a coating or treatment to the surface to protect or enhance its properties. It is not suited for filling internal voids or cracks.
- Guniting: Also known as shotcrete, this method involves spraying concrete or mortar onto a surface at high velocity. While useful for coating exposed soil and surfaces, it is not specifically designed to fill internal voids and fissures in loose gravels or rocky strata.
Given the above explanations, the correct answer is Grouting.
Conclusion: Grouting is the preferable method for addressing internal cavities, voids, or cracks in geological structures like loose gravels and rocky strata. It helps in strengthening the structure and preventing water ingress, among other uses.
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