Review Note

Last Update: 10/31/2024 01:04 AM

Current Deck: 6250 Questions

Published

Discuss the factors that influence rockbolt design, such as length, spacing, and load capacity. (5 marks)

Length

Consideration: Rockbolt length is determined by the depth and reach required to anchor into stable rock layers. Longer bolts may be necessary in weak or highly fractured ground to ensure anchorage within a competent layer.
Impact: Adequate length ensures bolts engage stable rock, allowing them to provide reliable support and resist ground movement effectively.

Spacing

Consideration: Spacing depends on rock quality, joint spacing, and load distribution. In highly jointed rock, closer spacing of bolts is required to support fragmented sections, while more competent rock allows for wider spacing.
Impact: Proper spacing ensures an even load distribution, preventing localized failures or unsupported zones in the tunnel structure.

Load Capacity

Consideration: The load capacity of rockbolts must be sufficient to support expected loads, including rock mass weight and any dynamic or seismic forces. This depends on bolt material strength and ground conditions.
Impact: Higher load capacity is crucial in deep tunnels or high-stress environments to ensure long-term support and stability under variable loading conditions.

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rockbolts

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