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通过对河南某场地进行冲击钻孔施工时产生的振动进行的现场测试,以评价其对周边建筑的影响。主要测试项目包括:地表加速度、深部土层加速度及土层的分层沉降。分析不同数目钻机同时施工时引起的振动在土层中的衰减规律以及波的传播规律、振动导致的建筑物周边地层的沉降,并提出保障建筑物安全的工程措施。研究表明:冲击钻孔时,地基会产生较大的振动,这种振动在地表和地层内部衰减较快;冲击振动产生的振动波主要以面波和剪切波两种途径传播;在周边建筑地表粉土层,振动的频率相对较低。采取隔孔打桩,并控制同时施工数量的方法能有效降低振动对周边建筑物的影响。
Through on-site testing of a site in Henan vibration generated vibration testing to assess its impact on the surrounding buildings. The main test items include: surface acceleration, deep soil acceleration and soil stratification. The law of attenuation of soil vibration caused by simultaneous construction of different numbers of drilling rigs as well as the law of wave propagation and the settlement of surrounding stratum caused by vibration are analyzed. Engineering measures to ensure the safety of buildings are also proposed. The results show that when the rock is bored, the foundation will produce a large vibration, which will attenuate rapidly in the surface and formation; the vibration waves generated by the impact vibration propagate mainly in the form of surface wave and shear wave; Soil surface layer, the frequency of vibration is relatively low. Adopting the method of hole piling and controlling the number of simultaneous construction can effectively reduce the impact of vibration on the surrounding buildings.