- 摘 要
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（吉林建筑大學土木工程學院， 長春 130118）
［摘要］通過原創(chuàng)的小模型半面樁原狀土試驗，分析不同含水率細粉砂土情況下，混凝土擴盤樁樁周土體的破壞狀態(tài)。研究結果表明，在豎向荷載作用下，混凝土擴盤樁盤下土體的破壞性狀基本為滑移破壞，但滑移范圍隨含水率變化而不同，其承載力也會受到影響，因此估算混凝土擴盤樁的承載力時應該乘以一個相應的調整系數，含水率不同調整系數也應有所差異。研究中改進了半面樁埋置試驗的承土器和埋樁方法，提出了混凝土擴盤樁單樁抗壓承載力計算時應考慮含水率，彌補了實際工程中忽略土體含水率對擴盤樁豎向承載力影響的缺陷，為完善混凝土擴盤樁在細粉砂土土層的設計應用提供理論基礎。
［關鍵詞］混凝土擴盤樁； 細粉砂土； 含水率； 抗壓破壞； 樁周土
中圖分類號：TU473-1文獻標識碼：A文章編號：1002-848X(2020)11-0119-04
Experimental study on influence of water content of fine sand soil for compressive failure of concrete expansion pile
QIAN Yongmei, ZHOU Tingting, TIAN Wei
(College of Civil Engineering, Jilin Jianzhu University, Changchun 130118， China)
Abstract:Through the original small model half-sided pile undisturbed soil test, the failure state of the soil around the pile of concrete expansion pile with different moisture content of fine sand soil was analyzed. The study results show that under the vertical load, the failure behavior of the soil under the concrete expansion pile is basically slip failure, but the slip range varies with the change of water content, and the bearing capacity is also affected. Therefore, the bearing capacity of concrete pile should be estimated by multiplied by a corresponding adjustment coefficient and the different adjustment coefficient of water content should also be different. The soil-bearing device and pile-burying method of half-sided pile-burying test were improved. Water content should be taken into account in the calculation of the compressive bearing capacity of concrete expansion pile, which makes up for the defects of ignoring the influence of soil water content on vertical bearing capacity of expansion pile in practical engineering. It provides a theoretical basis for improving the design and application of concrete expansion pile in fine sand soil layer.
Keywords:concrete expansion pile; fine sand soil; water content; compressive damage; soil around pile
*國家自然科學基金資助項目（51678275）。
作者簡介：錢永梅，博士，教授, Email:306109357@qq.com。
