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受钱塘江独特地质构造影响,承压水突涌日益成为钱塘江边地铁基坑成功与否的关键问题.针对钱塘江南岸典型地质条件,分析地铁基坑坑底粉土层厚度不同、隔水层厚度不同和基坑底部不同加固土指标,对基坑承压水安全系数、抗隆起安全系数和抗倾覆安全系数的影响,探讨承压水地铁基坑的突涌稳定性.增大坑底粉土层厚度或隔水层厚度可以确保基坑抗突涌稳定.采用坑底加固改善土体的抗剪强度,对提高坑底土的抗突涌稳定效果明显.
Due to the unique geological structure of the Qiantang River, the sudden rise of pressured water has become a key issue for the success of the foundation pit of the Qiantang River.According to the typical geological conditions on the south bank of the Qiantang River, Layer thickness and different reinforcement foundation at the bottom of foundation pit, the influence on safety factor of bearing water pressure, anti-swelling safety coefficient and anti-overturning safety factor of foundation pit are discussed, The thickness of silt layer or the thickness of aquitard can ensure the stability of foundation pit against bursting.It is effective to improve the shear strength of soil with pit bottom reinforcement, and it has obvious effect on improving the anti-surge stability of pit bottom soil.