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针对基坑开挖卸荷时土体的特殊应力应变关系,降水边界和桩土接触变化,提出了精细模拟方案:即利用HS模型来模拟基坑开挖卸荷情况下应力应变关系;考虑基坑侧降水对地表沉降的影响;在围护桩和土体之间施加Goodman接触面来模拟桩土间的滑移错位。对实例采用5种工况进行分析,并与实测结果相比较,结果证明该方法的正确性。
Aiming at the special stress-strain relations, the boundary of precipitation and the change of pile-soil contact during unloading of foundation pit, a detailed simulation scheme is put forward: HS model is used to simulate the stress-strain relationship under excavation unloading; The effect of pit side precipitation on the ground settlement is studied. Goodman contact surface is applied between the retaining pile and the soil to simulate the slip dislocation between pile and soil. Five kinds of working conditions were used to analyze the examples. Compared with the measured results, the results proved the correctness of the method.