随着废旧轮胎的日益剧增,回收利用率较低带来了严重的环保问题。利用废旧轮胎胶粉对红黏土进行改良,形成混合土。通过标准轻型击实试验、等效击实试验、直剪试验以及渗透试验,研究了不同胶粉掺量(0%,3%,8%,15%,25%)和不同含水量对混合土的击实特性、抗剪强度特性以及渗透性的影响。研究结果表明:①混合土的最大干密度比原状红黏土低,且胶粉的掺量越大,最大干密度越小;②胶粉掺量增大,标准击实试验的最优含水率增大,等效击实试验的最优含水率有减小趋势;③胶粉掺量不超过15%时,随着胶粉掺量增大,混合土的抗剪强度增大,内摩擦角增大,且出现应变硬化现象:④标准击实下,胶粉掺量为8%时,混合土的渗透速率变化不明显;但胶粉掺量增加到15%时,混合土的渗透速率显著提高,提升幅度达到97.3%。研究成果可为贵州地区今后废旧胶粉的循环利用和胶粉改良红黏土的工程运用提供参考。
Abstract
The low recycling rate of ever increasing waste tire has brought about severe environmental problems. In this research we prepared mixed soil samples by adding waste tire rubber powder into red clay, and examined the compaction strength, shear strength and permeability of the mixed soils with varied rubber powder content (0%, 3%, 8%, 15%, 25%) and water content via standard light compaction test, equivalent compaction test, direct shear test and penetration test. Results unveiled that (1) the maximum dry density of red clay mixed with rubber powder was lower than that of original red clay, and the maximum dry density decreased with the increase of rubber powder content. (2) With the growth of rubber powder content, the optimum water content augmented in standard compaction test but reduced in equivalent compaction test. (3) When rubber powder content was lower than 15%, both the shear strength and internal friction angle of the mixed soil climbed with the increase of rubber powder content, showing strain hardening features. (4) In standard compaction test, when rubber powder content was 8%, the permeability rate of mixed soil rarely changed, while when rubber powder content was 15%, the permeability rate soared with an increasing rate of 97.3%. The research findings offer reference for the recycling of waste rubber powder and the engineering application of modifying red clay with rubber powder.
关键词
红黏土 /
胶粉 /
击实特性 /
干密度 /
直剪试验 /
渗透性
Key words
red clay /
rubber powder /
compaction characteristics /
dry density /
direct shear test /
permeability
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基金
贵州省土木工程一流学科建设项目(QYNYL20170013);黔科合支撑项目(20182787)
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