By the check - out , inspection and measurement to start construction the industrial art to this test pile with the examination between stake body mass and bearing power , made sure the stroke reasonable operation method drilling under the dissolved cavern geology term ; the pier foundation loading test expressed the lading and rub the lading that resistance drag a glazing for of relation , and to the borehole cast - in - place concrete pile in the karst terrain deliver with break the mechanism , the characteristic of bearing power , proceeding the spot test job of the full of result ; the test data expresses the stake side friction resistance to rises with a bat batch terminal friction resistance very important function , the of tip of pile resistance drag occupies the proportion very few 通过对本次试桩施工工艺的检测和桩身质量及承载力的检验，确定了冲击钻在溶洞地质条件下的合理使用方法；基桩承载实验表明了荷载与摩擦阻力之间的关系，并对岩溶地区的嵌岩灌注桩的荷载传递和破坏机理、承载力特性，进行了富有成果的现场测试工作；试验数据表明桩侧摩阻和支盘端阻起很重要的作用，桩端阻力所占比例甚少。这与设计桩基时的计算模式相差很大，承载力也较设计增加；使用力学数值分析方法和有限单元法，对钻孔灌注桩桩端下的岩体强度和结构稳定性方面进行模拟计算和定量研究。
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Compared with the mud on wall form hole technology , clash stake technology or vibration sink pipe technology used in complex foundation stake forming , it has advantages of no vibration , no pollution , and no noise . in addition , since the concrete pressed into the drill stem sent vibration free concrete to the pump , so it is eas y to ensure the quality of the stake body . compared with the mud on wall and dry work form hole technology , the side obstruction and end obstruction of screw drill press concrete stake have all been accordingly improved , the weight bearing is better , and the transmutation of the complex foundation is less 其中，螺旋钻孔压灌混凝土成桩技术自研制以来，已在多项复合地基工程中进行了应用，较好地解决了软弱地层成孔困难的问题，适应地质条件范围广，成桩速度较快，工期短、工效高；与复合地基成桩时的泥浆护壁成孔工艺、振冲桩工艺或振动沉管工艺施工比较，具有无振动、无污染、无噪音的优点；另外，压入钻杆内的混凝土为泵送免振混凝土，因此桩体质量易于保证；与泥浆护壁和干作业成孔工艺相比，螺旋钻孔压灌混凝土成桩的侧阻和端阻都有相应的提高，桩的承载性能较好，复合地基的变形较小。
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