岩土工程中几种土的摩阻力辨析  

Analysis of Several Kinds of Soil Frictional Resistance in Geotechnical Engineering

作　　者：郝兵[1,2] 王清[1] 范铁强[3] 

机构地区：[1]吉林大学建设工程学院,长春市130026 [2]北京电力经济技术研究院,北京市100055 [3]北京市勘察设计研究院有限公司,北京市100038

出　　处：《勘察科学技术》2013年第6期12-15,26,共5页Site Investigation Science and Technology

摘　　要：岩土工程中的土钉、锚杆(索)、桩基的承载力计算中需要用到一个重要参数—土的摩阻力。设计一般依据勘察报告或者现行的规范的经验数据取值,但不同条件下土的摩阻力差别较大,勘察报告往往又不能全面地提供,有时甚至应用混乱。该文通过对土的摩阻力发生的机理、影响因素等方面理论和研究成果的梳理,辨析其中的差别。分析表明土的类别和物理力学性质是影响土的摩阻力的最主要因素,应力状态、桩土相对位移、成孔工艺以及尺寸效应也有较大影响,锚杆(索)与桩基的破坏模式不同是二者摩阻力有差异的根本原因,在粘性土中锚杆(索)的摩阻力小于桩基的侧阻力,粉土及砂土中二者相差不大,碎石类土和岩石中则锚杆(索)的摩阻力要大得多。In geotechnical engineering, the bearing capacity calculation of soil nailing, anchor（ cable an- chor） , pile foundation need to use an important parameter- soil frictional resistance. Designing usually uses the investigation report or experience values of prevailing standard, but the soil frictional resistance has large differences in different conditions. The investigation report cannot provide all the details, some- times even confused application. Through unscrambling the mechanism of soil frictional resistance and the influencing factors etc. , the difference among them is analyzed. The analysis indicated that soil catego- ries and the physical and mechanical properties are the most important factors influencing soil frictional resistance, and stress state, the pile-soil relative displacement, pore forming process and size effect are also influence it. Anchor （ cable anchor） and pile foundation failure mode is different, so its frictional re- sistance is also different. In a cohesive soil the friction resistance of anchor （cable anchor） is less than the pile shaft resistance, in silt and sand soil it is almost the same, but in gravel soil and rocks the fric- tion resistance of anchor （cable anchor） is much bigger.

关 键 词：摩阻力 土钉 锚杆(索) 桩基 

分 类 号：TU43[建筑科学—岩土工程]