加筋土挡墙碳排放计算方法与减排性分析

doi:10.13229/j.cnki.jdxbgxb20191141

摘要/Abstract

摘要：

针对两种形式土工合成材料加筋土挡墙进行基于规范的稳定性加筋设计，并评估其减排性能；通过与传统重力式挡墙对比，分析了不同设计参数对其减排特性的影响规律。相比重力式挡墙，土工合成材料加筋土挡墙的应用至少可以减少50%的碳排放量；得益于加筋土挡墙良好的抗震特性，其减排性随水平地震加速度的增大而增大，但影响程度较小；植物光合作用减排性随固碳年限线性增大，包裹植生式加筋土挡墙运用植被替代面板使其减排率超过90%，当挡墙建成后3~10年便可达到减排率100%，实现绿色生态支护。

关键词: 岩土工程, 减排特性, 土工合成材料, 加筋土挡墙, 地震作用

Abstract:

Two types of Geosynthetic-reinforced Walls （GRWs） are considered here to assess their emission reduction performance based on stability design. Comparing with the gravity retaining walls， the influences of various design parameters are further investigated on the carbon emission reduction performance. Using GRWs can reduce carbon emission by at least 50%. Due to the excellent anti-seismic property of GRWs， the carbon emission reduction performance increases as the horizontal seismic acceleration increases， but it is insignificant. The carbon emission reduction performance of photosynthesis increases linearly with the carbon fixation years. Vegetated rap-around GRWs uses plants rather than panels to make its emission reduction rate exceed 90%. When the constructions of GRWs is completed， about 3~10 years later， the carbon emission mitigation rate can reach 100%， thus acheiving green ecological support.

Key words: geotechnical engineering, emission reduction characteristics, geosynthetics, reinforced wall, seismicity

中图分类号:

张飞,朱玉明,杨尚川,王庶懋. 加筋土挡墙碳排放计算方法与减排性分析[J]. 吉林大学学报(工学版), 2021, 51(2): 631-637.

Fei ZHANG,Yu-ming ZHU,Shang-chuan YANG,Shu-mao WANG. Emission mitigation analysis of geosynthetic⁃reinforced walls[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(2): 631-637.

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材料	CO₂排放因子	单位
砂	2.51	kg CO₂e.t^-1
碎石	2.18	kg CO₂e.t^-1
黏土	2.69	kg CO₂e.t^-1
柴油	72.59	t CO₂.TJ^-1
C25混凝土	414.82	kg CO₂e.m^-3
热轧碳钢钢筋	2340.00	kg CO₂e.t^-1
预制混凝土面板	336.00	kg CO₂e.m^-1
土工格栅（HDPE）	1.36	kg CO₂e.m^-2

稳定性安全系数	基本组合	地震作用组合
抗滑移稳定性系数	1.3	1.1
抗倾覆稳定性系数	1.6	1.2
基本合力偏心距	≤0.17	≤0.22

墙高/m	墙后填土内摩擦角/(°)	重力式挡墙		面板式加筋土挡墙
墙高/m	墙后填土内摩擦角/(°)	混凝土体/m³	填土体积/m³	预制面板块数/块	填土体积/m³	土工格栅铺设面积/m²
2	25	2.74	12.00	15	12.00	15.00
	30	2.28	12.00	15	12.00	12.50
	35	1.88	12.00	15	12.00	12.00
	40	1.52	12.00	15	12.00	10.00
3	25	5.12	18.00	23	18.00	22.08
	30	4.28	18.00	23	18.00	17.71
	35	3.53	18.00	23	18.00	17.50
	40	2.93	18.00	23	18.00	17.50
4	25	8.20	24.00	30	24.00	39.38
	30	6.80	24.00	30	24.00	34.21
	35	5.60	24.00	30	24.00	31.00
	40	4.76	24.00	30	24.00	31.00
5	25	11.98	30.00	38	30.00	57.07
	30	9.93	30.00	38	30.00	47.71
	35	8.18	30.00	38	30.00	47.71
	40	7.03	30.00	38	30.00	47.71
6	25	16.38	36.00	46	36.00	83.04
	30	13.62	36.00	46	36.00	68.16
	35	11.22	36.00	46	36.00	68.00
	40	9.72	36.00	46	36.00	68.00
7	25	21.53	42.00	53	42.00	113.81
	30	17.89	42.00	53	42.00	93.48
	35	14.74	42.00	53	42.00	93.10
	40	12.85	42.00	53	42.00	93.10
8	25	27.28	48.00	61	54.24	169.50
	30	22.72	48.00	61	48.00	140.00
	35	18.72	48.00	61	48.00	134.40
	40	16.32	48.00	61	48.00	134.40

植物名称	年固碳推估值/[(kg CO₂)?m^-2?a^-1]
百喜草	10.12
白花三叶草	8.16
结缕草	7.81
假俭草	5.20
意大利黑麦草	3.47

k_h/g	墙高/m	墙后填土内摩擦角/(°)	重力式挡墙		面板式加筋土挡墙
k_h/g	墙高/m	墙后填土内摩擦角/(°)	混凝土体积/m³	填土体积/m³	预制面板块数/块	填土体积/m³	土工格栅铺设面积/m²
0.05	4	30	6.80	24.00	30	24.00	35.09
	6	30	13.62	36.00	45	36.00	74.72
	8	30	22.72	48.00	61	49.12	153.50
0.10	4	30	6.80	24.00	30	24.00	37.95
	6	30	13.62	36.00	45	36.00	81.60
	8	30	22.72	48.00	61	53.84	168.25
0.15	4	30	6.84	24.00	30	24.00	40.81
	6	30	13.68	36.00	45	36.00	88.48
	8	30	22.72	48.00	61	58.72	183.50
0.20	4	30	7.44	24.00	30	24.00	43.78
	6	30	14.88	36.00	45	36.00	95.52
	8	30	24.80	48.00	61	63.60	198.75
0.30	4	30	7.96	24.00	30	24.00	50.05
	6	30	15.90	36.00	45	41.46	110.56
	8	30	26.48	48.00	61	74.16	231.75