| 引用本文: | 姜智盛,郑文忠,李瑞森,王英.混凝土厚板静态破碎试验研究[J].哈尔滨工业大学学报,2022,54(4):25.DOI:10.11918/202103039 |
| JIANG Zhisheng,ZHENG Wenzhong,LI Ruisen,WANG Ying.Experimental study on static crushing of thick concrete slab[J].Journal of Harbin Institute of Technology,2022,54(4):25.DOI:10.11918/202103039 |
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| 混凝土厚板静态破碎试验研究 |
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姜智盛1,2,郑文忠1,2,李瑞森1,2,王英1,2
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(1.结构工程灾变与控制教育部重点实验室(哈尔滨工业大学),哈尔滨 150090; 2.土木工程智能防灾减灾工业和信息化部重点实验室(哈尔滨工业大学),哈尔滨 150090)
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| 摘要: |
| 为考察孔深和外围孔与内孔灌入破碎剂浆体的间隔时间对混凝土厚板静态破碎效果的影响,开展了7个混凝土厚板试件的静态破碎试验。垂直于厚板顶面钻孔,并在破碎前沿孔连线及其延长线方向双向切断厚板上部纵筋。试验结果表明:孔深小于板厚的70%时,破碎剂浆体结硬膨胀引起的裂缝已无法向下延伸至厚板底部；孔深由板厚的70%增至90%时,破碎效果逐渐提高,但破碎后形成块体的最小短边尺寸和最大长边尺寸相近,孔深为板厚的80%时,破碎后形成块体的数量最多；先外围孔灌入破碎剂浆体,经历一段时间浆体结硬膨胀后再向内孔灌入破碎剂浆体,与所有钻孔同时灌入破碎剂浆体相比,破碎效果提高,其中对外围区域的提高比对内部区域的提高明显,此外,破碎后形成块体的数量、最小短边尺寸和最大长边尺寸相近。基于试验结果,给出如下建议:破碎混凝土厚板时,孔深应取为板厚的80%；宜采用先外围孔灌入破碎剂浆体,待外围孔内浆体结硬膨胀后再向内孔灌入破碎剂浆体的方法。 |
| 关键词: 静态破碎 混凝土厚板 孔深 间隔灌浆 破碎效果 |
| DOI：10.11918/202103039 |
| 分类号:TU37 |
| 文献标识码:A |
| 基金项目:国家重点研发计划(2017YFC0806100) |
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| Experimental study on static crushing of thick concrete slab |
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JIANG Zhisheng1,2,ZHENG Wenzhong1,2,LI Ruisen1,2,WANG Ying1,2
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(1.Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology), Ministry of Education,Harbin 150090, China; 2.Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters (Harbin Institute of Technology), Ministry of Industry and Information Technology, Harbin 150090, China)
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| Abstract: |
| To investigate the effects of hole depths as well as the intervals of slurry grouting into outer holes and inner holes on the static crushing effect of thick concrete slabs, static crushing tests of seven thick concrete slab specimens were carried out. Boreholes were drilled perpendicular to the top surface of the thick concrete slab, and the longitudinal reinforcements on the upper part of the thick slab were cut off in two directions along the hole connecting line and its extension before crushing. Results showed that when the hole depth was less than 70% of the slab thickness, the cracks caused by the hardening and expansion of the slurry could not extend down to the bottom of the slab. When the hole depth increased from 70% to 90% of the slab thickness, the crushing effect was gradually improved, but the size of the minimum short edge and the size of the maximum long edge of the blocks after crushing were similar. When the hole depth was 80% of the slab thickness, the number of the blocks generated after crushing was the most. The slurry was first grouted into the outer holes and then into the inner holes after a certain time of hardening and expansion. Compared with the method of grouting all the boreholes at the same time, the crushing effect was improved, and the improvement in the external area was more obvious than that in the internal area. Besides, the number, the size of the minimum short edge, and the size of the maximum long edge of the blocks after crushing were similar. Based on the test results, the following suggestions are given: when crushing thick concrete slabs, the hole depth should be 80% of the slab thickness; it is better to first grout the slurry into the outer holes, and then the inner holes after the hardening and expansion of the slurry. |
| Key words: static crushing thick concrete slab hole depth interval grouting crushing effect |
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