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| Experimental study on stress field distribution characteristics of slab-culvert under high embankments |
| LI Guowei1，2，MI Shuaiqi2，3，QIU Hongchao4，WU Jiantao2，LI Jun5，WU Guisheng4 |
| (1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering，Hohai University，Nanjing，Jiangsu 210098，China；2. Highway and Railway Research Institute，Hohai University，Nanjing，Jiangsu 210098，China；
3. CCCC Second Highway Consultants Co.，Ltd.，Wuhan，Hubei 430056，China；4. Guangdong Provincial Transportation Planning and Design Institute Group Co.，Ltd.，Guangzhou，Guangdong 510507，China；5. Kaiyang Expansion
Management Office，Guangdong Freeway Co.，Ltd.，Guangzhou，Guangdong 529339，China) |
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Abstract Through field test and numerical simulation，the stress field distribution characteristics of high embankment slab-culvert and the surrounding soil are studied. The results show that the earth pressure at each point of the culvert is approximately linearly related to the self-weight of the filling soils over it，The linear coefficient is the unimodal curve with the width to height ratio of the slab-culvert，Based on this，an empirical formula for the midpoint pressure at the top of culvert is established，and compared with the standard method，the calculation accuracy is improved greatly. Under the influence of stress concentration at the top of culvert，the earth pressure on the plane of the culvert top presents M distribution，and the non-uniform distribution is about 1.5 times of the width of the culvert. The culvert has an effect on the distribution of soil pressure in the upper 1.5 times of the embankment?s height，and the profile shape of the affected area is inverted trapezoid. According to the distribution characteristics of earth pressure in the soil on both sides and above the culvert，the range of unequal compaction to reduce the pressure at the top of culvert is proposed. The horizontal pressure at each point on both sides of the slab-culvert is less than the static earth pressure，according to this design slab-culvert is biased to safety.
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2022, Vol. 41 
