在岩体地下工程施工中，经常遇到复杂的地质条件，尤其是溶洞、断层等特殊条件，给桩基施工带来了巨大挑战。为了研究复杂岩溶地质下桩基钻孔数据的准确性，本文以江西九江银沙湾岩溶区桩基项目为依托，基于全场地钻孔数据，提出了溶洞梯度角的空间特征概念，运用JC方法对钻孔数据进行了可靠度分析。结果显示：此岩溶桩基施工场地钻孔含溶洞率超过50%，岩溶极为发育。针对溶洞梯度角的四种空间分布方式，优先筛出了含溶洞信息准确性较高的钻孔数据。通过JC方法对准确性较低的数据进行可靠性分析，发现以小、中、大溶洞深度为参考值计算的梯度角均服从正态分布，且钻孔识别溶洞特征的准确性随着溶洞深度增加而显著提高。最后，在控制补钻率的基础上，提出了数据筛选与优化策略，通过定量指标对比，验证了补钻率控制在5%左右能够显著提升钻探结果的可靠性。

In the construction of underground rock projects, complex geological conditions are often encountered, especially special conditions such as karst caves and faults, which bring great challenges to pile foundation construction. To study the accuracy of pile foundation drilling data under complex karst geology, this paper takes the pile foundation project in Yinshawan Karst Area, Jiujiang, Jiangxi as the basis, and proposes the spatial characteristics of cave gradient angle based on the drilling data of the whole site, and uses the JC method to analyze the reliability of drilling data. The results show that the cave rate of the boreholes in this karst pile foundation construction site exceeds 50%, and the karst is extremely developed. According to the four spatial distribution modes of cave gradient angle, the drilling data with higher accuracy of cave information are preferentially screened out. The JC method is used to analyze the reliability of the data with lower accuracy, and it is found that the gradient angles calculated with small, medium and large cave depths as reference values all obey the normal distribution, and the accuracy of drilling hole identification of cave characteristics increases significantly with the increase of cave depth. Finally, on the basis of controlling the supplementary drilling rate, a data screening and optimization strategy is proposed. Through the comparison of quantitative indicators, it is verified that the supplementary drilling rate controlled at about 5% can significantly improve the reliability of drilling results

TU194 ???? ????? ???

长江重庆航道工程局科技项目(H20230330)；重庆市自然科学基金创新发展联合基金(DZ-CG-20220325-1)；大足石刻研究院科研委托项目(GF-2000-0203)。