Design method for built-in foundation of high and steep slope bridge

Abstract

The invention discloses a design method for a built-in foundation of a high and steep slope bridge, which provides a more scientific design basis for the design of the built-in foundation and greatly improves the engineering economy of the built-in foundation. Comprising the following steps: (1) initially simulating building-in foundation design parameters; (2) calculating the lateral pressure P1 of the most unfavorable shear-resistant height below the anchoring surface according to the stress of the anchoring point; (3) calculating the shear capacity T of the rock mass in the most unfavorable height range below the anchoring surface; (4) judging whether the shear capacity T of the rock mass at the worst height below the anchoring surface is greater than the lateral pressure P1 at the worst height below the anchoring surface; (5) calculating the vertical allowable bearing capacity [P] of the built-in foundation according to the built-in foundation degree H determined in the step (4); (6) checking whether the vertical allowable bearing capacity [P] of the foundation meets the design requirement according to the following formula: [P] is greater than or equal to P + W; and if the requirement of the formula is not met, deepening the length H of the built-in foundation further, and repeating the step 4 and the step 5 until the design requirement is met.

Description

technical field [0001] The invention relates to civil engineering, in particular to a design method for embedding foundations of bridges with high and steep slopes. Background technique [0002] The embedded foundation is an independent foundation embedded in the rock foundation. It has the characteristics of convenient construction, less excavation volume and less impact on the environment under good geological conditions. refer to figure 1 and figure 2 , compared with the pile foundation and open-cut foundation, the excavation area is much smaller than that of cap or open-cut foundation, which causes less damage to the mountain and is well coordinated with the natural environment. Especially on high and steep slopes with relatively good rocks, it is not suitable to use open cut foundations, and if the pile foundation cap is to be buried below the ground, the soil on the side of the mountain must be sloped and excavated, causing large-scale mountain damage. [0003] Emb...

AI Technical Summary

Problems solved by technology

"If according to the above regulations, for a rock-socketed foundation with a diameter of about 15m, the distance between the anchor point and the edge of the slope should be more than 30m, which is too conservative and not scientific enough, resulting in poor economic efficiency of the project. The stress of the pile foundation matches the

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