【摘要】 为了突破由于静力触探机械动力不足而使触探技术无法应用到较硬土层或软岩的限制,对墙体砌块试样用角片式探头在室内旋进式触探仪上进行不同探入速度和旋转速度控制条件下的试验,以模拟较硬地层的旋进式触探试验。测试所得的轴向压力和扭矩值随探入深度的变化可分成3个阶段:初探段、上升段和平稳段。对试验结果进行比较分析,证实了将圆锥探头单纯地压入岩土体的方式,改变为具有切削功能的探头,被旋转压入岩土体的探入方式能在现有机械设备的探入动力条件下实现探头在较硬土层及软岩中探入。从理论和室内试验两方面验证了探入方式的改变是确保探头在坚硬黄土、冻土及软岩地区顺利平衡地探测的有效措施。更多还原

【Abstract】 The building blocks were drilled by the triangle-shaped probe unit with different rotational speed and penetration speed on the rotary penetration apparatus in the laboratory in order to study the influence of cutting action and penetration mode on penetration resistance.The data of axial pressure and torque as well as depth of penetration were collected during the test.The typical S-shaped result curve between axial pressure,torque and the depth of penetration is composed of three parts,which are starting,climbing and steady part.The conclusion was reached by analyzing the laboratory test data that the different penetration methods from CPT enables the probe unit to be pressed in soft rock or hard soil with available mechanical equipment.Theoretical analysis and laboratory tests indicate that the way of probe unit with cutting edge is rotated during being pushing in is an efficient measure for probe unit to go smoothly through the harder strata such as hard loess,soft rock and frozen soil.更多还原