Vol.27 No.2 李占强等：夯实高饱和度地基士的强度特性 ·155· Strength behaviour of unsaturated compacted silt with high-saturated degree under controlled suction conditions LI Zhangiang"YANG Weimin,ZHAO Changzhou 1)Institue of Engineering and Technology,China University of Geoscience,Beijing 00083,China 2)Department of Resource and Environment,Anhui University of Science and Technology,Huainan 232001,China ABSTRACT Under controlled suction conditions,CD shear tests were conducted using a modified triaxial shear apparatus on dynamic compacted unsaturated silt from the foundation of the Local-Tax Building in Shijiazhuang city,China.The test results clearly demonstrated that suction severely influences the shear strength of the soil.The relationships of the effective cohesion and the friction angle to the suction are well linear.The effective cohesion in- creases and the friction angle decreases with increasing suction.In a given suction range,the influence of the suction on the effective cohesion is more evident than the friction angle.The failure envelope of the compacted silt is not a plane,which shows convergent with increasing the net average stress and the suction.When the confining pressure is higher than 300 kPa,it plays the leading role on strength,not the suction. KEY WORDS unsaturated soil;suction;compacted silt;stress-strain relationship;strength (上接第141页) Analysis of cutting slope reinforcement in swelling rock and soil WU Shunchuan,ZHANG Youpa,GAO Yongtao Civil and Environment Engineering School,University of Science and Technology Beijing,Beijing 100083,China ABSTRACT According to the unstable situation of an expressway cutting slope located in Zhengzhou city of China,four retaining regions were divided by reinforcement design and different reinforced structures were adopted in the four regions.Based on the design parameters of the reinforced structures and the natural mechanical properties of the rock cutting slope,the stability of the cutting slope after reinforcement was analyzed by numerical analysis. The result shows that besides the reinforced structures and the self-reinforced anchor bars perform high loading-ca- pacity,the reinforced structures and the rock cutting slope have come into being a whole integer. KEY WORDS highway engineering;cutting slope;reinforced structure;self-reinforced anchor bar;stability; numerical analysis】 李 占强 等 夯实 高饱 和 度地 基 土 的强 度特 性 一 姗 刀 毛别入 肠 毛 搜口 儿 统 ， ， ， ， ， ， ， 一 几 ， 角 衍 ， ， 衍 ， 廿 ， ， · 一 上 接 第 页 ﹃且 曰 一峪︼ 产 砰 ， 刀侧刃 ， 咬 刀 ， ， ， ， ， · 一 ， ·