木质素磺酸钙固化黄土的力学性能研究

Study on Mechanical Properties of Loess Solidified by Calcium Lignosulfonate

文章以木质素磺酸钙为固化剂,以兰州市西固区的黄土为固化对象,开展木质素磺酸钙固化黄土的力学性能研究。通过重型标准击实试验、无侧限抗压强度试验及回弹模量试验,研究固化剂掺量和养护龄期对木质素磺酸钙固化黄土无侧限抗压强度和回弹模量的影响。结果表明:当木质素磺酸钙掺量增加时固化黄土的最大干密度上升、最优含水率下降;固化剂掺量不超过1%时,固化黄土的无侧限抗压强度随养护龄期的增长而增加,而当掺量超过1%后,固化黄土的无侧限抗压强度则会出现下降;随着养护时间的增加,固化黄土的回弹模量逐渐增大,随固化剂掺量的增加回弹模量先增大后减小;基于无侧限抗压强度的试验数据,建立了木质素磺酸钙固化黄土无侧限抗压强度与养护龄期的关系,所得成果可为工程实践提供参考。

This paper study the mechanical properties of calcium lignosulfonate solidified loess by using calci-um lignosulfonate as curing agent and loess in Xigu District of Lanzhou City as curing object.The effects of curing agent content and curing age on the unconfined compressive strength and rebound modulus of calcium lignosulfo-nate solidified loess were studied by heavy standard compaction test,unconfined compressive strength test and re-bound modulus test.The results show that the maximum dry density of solidified loess increases and the optimal moisture content decreases with the increase of calcium lignosulfonate content.When the content of curing agent is less than 1%,the unconfined compressive strength of solidified loess increases with the increase of curing age,but decreases when the content is more than 1%.With the increase of curing time,the resilience modulus of solidified loess gradually increased,and with the increase of curing agent content,the resilience modulus first increased and then decreased.Based on the experimental data of unconfined compressive strength,the relationship between un-confined compressive strength and curing age of calcium lignosulfonate solidified loess was established.The ob-tained results can provide reference for engineering practice.