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为研究基坑底部局部超挖对复合土钉结构受力性状的影响,以深圳市某基坑工程为例,运用ABAQUS分析了不同超挖深度下复合结构的受力状态,并研究了桩身嵌固深度及桩径变化对结构受力性状的影响。研究结果表明:随着超挖深度的加大,桩身及土钉受力明显恶化;桩身嵌固深度存在临界值;适当增大桩径,能减小桩身的拉应力。
In order to study the effect of partial over excavation at the bottom of foundation pit on the mechanical behavior of composite soil nailing structure, taking a foundation pit project in Shenzhen as an example, the stress state of composite structure under different overbreak depths was analyzed by using ABAQUS. Effect of Embedded Depth and Pile Diameter on Mechanical Behavior of Structures. The results show that with the increase of over excavation depth, the stress of pile body and soil nail deteriorates obviously. There is a critical value for the depth of pile embedment. Appropriate increase of pile diameter can reduce the tensile stress of pile.