汽车行驶震动对浅埋暗挖施工的影响

城市浅埋暗挖法常应用于繁华地带道路下修建人防地下商业街和过街通道等地下工程.这类工程顶板距离地表一般比较浅,道路上汽车行驶震动将对浅埋暗挖施工造成较大的影响.利用ANSYS进行数值模拟定性地分析了行车震动在人防工程水平和竖直方向的传播规律,结合洛阳市纱厂南路浅埋暗挖工程进行震动参数测试,获取了道路下钢筋混凝土结构水平和竖直方向的加速度,研究了行车震动在钢筋混凝土结构中的传播规律以及对浅埋暗挖施工的影响.结果 表明:在水平方向上,从跨中至两侧,加速度值逐渐减小;在竖直方向上,由上至下,加速度值呈线性减小规律;有汽车通过时加速度值是无汽车通过时的1.48～5.33倍,路面汽车行驶对道路下浅埋暗挖土方开挖的不利影响比较明显.

Research on Influence of Vehicle Vibration on Construction of Shallow Buried Excavation

The urban shallow buried tunneling method is often used in the construction of civil air defense underground commercial streets and crossing passages in prosperous urban areas. The roof of this kind of project is generally relatively shallow from the ground surface, and the vibration caused by the driving of the car on the road will have a greater impact on the shallow buried and underground excavation construction. Numerical simulation based on ANSYS qualitatively analyzes the propagation law of vehicle vibration in the horizontal and vertical directions of civil air defense project, the vibration parameter of the shallow-buried underground excavation project of Shachang South Road in Luoyang City were tested, the horizontal and vertical acceleration of reinforced concrete structures under the road were obtained. The results show that in the horizontal direction, the acceleration value gradually decreases from the mid-span to the sides. In the horizontal direction, from top to bottom, the acceleration value decreases linearly. The acceleration value of vehicle passing is 1.48~5.33 times of that no vehicle, the adverse effects of road vehicles on the construction of shallow buried and underground excavation are obvious.