水泥或石灰改良红黏土的力学强度特性试验研究

摘要

采用水泥或石灰对江西省某高速公路红黏土进行改良,并采用击实试验、承载比(CBR)试验和无侧限抗压强度试验,研究改良红黏土的击实特性和力学强度特性.结果表明:水泥或石灰的掺量越高,改良红黏土的最大干密度和最优含水率均增大;水泥用量为10％～15％或石灰用量为5％～10％时,改良红黏土的CBR、无侧限抗压强度和回弹模量较大;尽管干湿循环对改良红黏土的强度不利,但水泥或石灰用量越高,干湿循环后的CBR和无侧限抗压强度越大.建议改良红黏土的水泥用量范围为10％～15％、石灰用量范围5％ ～10％.%Cement or lime was used to stabilize the red clay along a highway in Jiangxi province.The compaction test,California Bearing Ratio (CBR) test and unconfined compressive strength test were conducted to study the compaction and mechanical strength characteristics of this stabilized red clay.The result shows that,the higher the cement or lime content,the larger the maximum dry density and optimum water content of this stabilized red clay;where the cement content is 10 ％ ～ 15 ％,or the lime content is 5 ％ ～ 10 ％,this clay has relatively high CBR,unconfined compressive strength and resilient modulus;although dry-wet cycle has adverse effect on the strength,after the dry-wet cycle,the more the cement or lime is mixed,the larger the CBR and unconfined compressive strength are.It is advised that the dosage range of cement or lime for red clay stabilization is 10 ％ ～15 ％ or 5 ％ ～10 ％ respectively.