三标度层次分析法在基桩超声透射法中的应用

Application of Three Scale Analytic Hierarchy Process in Pile Ultrasonic Transmission Method

为合理评估基桩的完整性类别,通过基桩超声透射法,分别从声速、波幅和波形3个方面提出三标度层次分析法,建立评价指标的比较矩阵来确定各指标特征权重。结合各评价指标的隶属函数确立隶属度矩阵,构建基桩的模糊综合评价模型,并依据模糊数学中的最大隶属度原则确定声测线的完整性类别。再根据基桩受力结构,从基桩的声测线(检测剖面)、检测横截面和整个桩身3部分综合评判基桩的完整性类别。对山东模拟缺陷桩采用三标度模糊层次分析法进行判定,评价结果与现行评判标准相吻合,体现了该方法的实用性和可行性。

In order to reasonably evaluate the integrity category of foundation piles,three scale analytic hierarchy process(AHP)is proposed from the three aspects of sound velocity,wave amplitude and waveform respectively through the ultrasonic transmission method of foundation piles.The comparison matrix of evaluation indexes is established to determine the weight of each index feature.The membership matrix is es⁃tablished in combination with the membership function of each evaluation index.The fuzzy comprehensive evaluation model of foundation piles is established.The integrity category of acoustic measuring lines is determined according to the maximum membership principle in fuzzy mathe⁃matics.Then,according to the stress structure of the foundation pile,the integrity category of the foundation pile is comprehensively evaluated from the three parts of the acoustic measuring line(detection profile),the detection cross-section and the whole pile body.Three scale fuzzy analytic hierarchy process is used to judge simulated defective piles in Shandong,and the evaluation result is consistent with the current evalu⁃ation standard,reflecting the practicability and feasibility of this method.