基于AHP-模糊综合评价法的水泥搅拌桩质量评价与应用

Based on AHP-fuzzy comprehensive evaluation method of cement mixing pile quality evaluation and application

摘要

水泥搅拌桩被广泛地应用于我国许多软土地区用以处理软弱地基，但是针对其隐蔽的工程特性，如何及时、有效地对其工后质量进行评价，目前还缺乏科学有效的方法。以广东省中山市某软基搅拌桩处治工程为例，基于智能化监测系统结合现场检测试验，采用AHP-模糊综合评价的方法对水泥搅拌桩的成桩质量进行评价。首先确定搅拌桩成桩质量的评价指标及隶属度函数，然后采用层次分析法计算对应评价指标权重，其次将模糊综合评价法用于水泥搅拌桩成桩质量评价，最后将评价结果与工程实际进行对比分析。结果显示：监测桩长和实际桩长之间的误差小于2%,监测段灰量与桩身强度、钻杆平均速度与桩身完整性之间的拟合优度均较高，成桩质量模糊综合评价结果与抽取芯样的芯样特征之间的吻合程度较高。结果表明：应用此评价指标体系再结合模糊综合评价的方法能很好地反映实际工程中水泥搅拌桩质量检测的结果，验证了该方法用于水泥搅拌桩成桩质量快速评价的可行性，为改进水泥搅拌桩施工阶段内容及提高施工质量提供参考。

Abstract

Cement mixing piles are widely used in many soft soil areas in China to treat weak foundations. However, in view of its hidden engineering characteristics, how to evaluate its post-construction quality in a timely and effective manner is still a lack of scientific and effective method. Taking a soft foundation mixing pile treatment project in Zhongshan City, Guangdong Province as an example, it is based on the intelligent monitoring system combined with the field tests. It uses the AHP-fuzzy comprehensive evaluation method to evaluate the quality of cement mixing piles. Firstly, the evaluation index and membership function of the quality of the mixing pile are determined, and then the weight of the corresponding evaluation index is calculated by the analytic hierarchy process. Secondly, the fuzzy comprehensive evaluation method is used to evaluate the quality of the cement mixing pile. Finally, the evaluation result are compared with the engineering practice. The result show that the error between the monitored pile length and the actual pile length is less than 2%. The goodness of fit between the ash content of the monitoring section and the strength of the pile body is high, and the goodness of fit between the average speed of the drill pipe and the integrity of the pile body is also high. The fuzzy comprehensive evaluation result of pile quality are in good agreement with the core sample characteristics of the core sample. The result show that the application of this evaluation index system combined with the fuzzy comprehensive evaluation method can well reflect the result of the quality inspection of cement mixing piles in practical engineering, and verify the feasibility of this method for the rapid evaluation of the quality of cement mixing piles. It provides a reference for improving the content of the construction stage of cement mixing piles and improving the construction quality.

关键词

软土地区 / 水泥搅拌桩 / 施工质量评价 / 层次分析法 / 模糊综合评价法

Key words

soft soil area / cement mixing pile / construction quality assessment / analytic hierarchy process / fuzzy comprehensive evaluation method

基金资助

中山市民古路一期工程软基处理科研项目(KYHT2023-117)

国家重点研发计划(2021YFB2600402)