用于基坑自动测斜的圆柱螺线模型的改进

An Improved Cylinder Helix Model in Automatic Foundation Inclination Survey

在岩土工程的基坑水平位移监测中,人工测斜仪耗费时间、人力较多,信息更新滞后,为此,研究出一种基于高精度的加速度传感器的自动测斜方法。该方法利用加速度传感器测得测点角度信息,难度在于如何通过离散的测点信息计算未知的测段位移信息。对此,提出一种改进的圆柱螺线算法。将原先应用于定向钻井设计的圆柱螺线法改进,简化公式,降低算法编程的复杂度,处理测段特殊点,校正测量方向。通过Matlab进行数据仿真,验证了改进的圆柱螺线法是适用于基坑工程的自动测斜方法。在保证效率的同时,相比人工测斜仪使用的折线法,圆柱螺线法测量的数据更精准。

During the horizontal displacement monitoring of the foundation pit in geotechnical engineering,manual inclinometer takes too much time and effort with slow information updating.An automatic survey method is thus devised based on the high precision acceleration sensor.The method uses the acceleration sensor to measure the angle information of the measurement point.The difficulty lies in calculating the displacement information of the measurement segment through discrete information of the measurement points.Therefore,an improved cylinder helix algorithm is put forward.The cylinder helix algorithm originally applied to directional drilling design is improved,such as,simplifying formula to reduce the complexity of programming,handling special points of measurement segment and correcting direction of measurement.Simulation results in Matlab show that,the improved cylinder helix algorithm is applicable to the automatic survey method of foundation pit engineering,and guarantees the efficiency.Moreover,the data are more accurate than those obtained through polygonal line with a manual inclinometer.