水泥土搅拌桩沿海软基处理

doi:10.6040/j.issn.1672-3961.0.2019.256

Abstract

Abstract:

Direct construction of roads and railways on coastal soft soil foundation leads to subgrade instability and other problems, and foundation treatment must be carried out. Based on the actual project, the pile arrangement simulation analysis was carried out and the pile arrangement parameters of cement-soil mixing piles were optimized. Through indoor mix proportion test and on-site pile forming test, the influencing factors of cement-soil strength and pile forming quality of cement-soil mixing pile were analyzed. The results showed that the proposed pile arrangement scheme was safe and feasible and cost saving. The optimal range of cement content in cement soil was 16%-18%, and the unconfined compressive strength at short-term age could reach 60%-70% of the standard age, which shortened the construction period; During the construction, the pile-forming technology of four stirring and four spraying was of the best quality. Preservatives were very important to the quality and durability of pile body. Through pile quality inspection, it was comprehensively judged that the reinforcement effect of cement-soil mixing pile in this project meeted the requirements. The research results had certain reference value for similar projects and provide on-site basis for the formulation of technical standards and construction methods.

Key words: cement-soil mixing pile, coastal region, soft foundation treatment, indoor and outdoor experiments

CLC Number:

U416.1

Guoren LÜ,Jiandong GE,Haitao XIAO. Treatment of coastal soft foundation with cement-soil mixing pile[J].Journal of Shandong University(Engineering Science), 2020, 50(3): 73-81.

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方案序号	桩型	桩径/m	桩间距/m	桩长/m	桩型布置	备注
1	水泥土搅拌桩	0.5	1.1	9	三角形	采取临时防护措施
2	水泥土搅拌桩	0.5	1.2	6~12	三角形	桩长由里到外依次呈台阶状递增,桩长分别为6、10、12 m,加固范围加固至坡脚外5 m
3	水泥土搅拌桩+旋喷桩	0.5	1.1	9	三角形	临近既有线段落采用两排旋喷桩加固,外侧用水泥土搅拌桩加固

土石名称	土层状态	天然密度/(g·cm^-3)	桩周摩阻力/kPa	桩端极限承载力/kPa	基本承载力/kPa	压缩模量/MPa	黏聚力/kPa	内摩擦角/(°)
粉质黏土	软塑	1.84	30	1 500	90	2.5	29	8.0
粉质黏土	软塑	1.85	35	1 500	100	2.9	30	8.5
粉土	饱和	1.98	35	1 500	90	5.5	17	23.0
粉砂	饱和	1.95	25	1 800	90	6.0	3	25.0
粉质黏土	软塑-硬塑	19.50	40	1 600	120	4.2	33	9.5
粉土	饱和	2.00	45	1 600	120	6.2	17	22.0

方案序号	方案	承载力/kPa	沉降/m	最小稳定系数	总桩长/m
1	桩径0.5 m,桩间距1.1 m,桩长9.0 m	163	0.262	1.38	381 765
2	桩径0.5 m,桩间距1.2 m,桩长成台阶状6~12.0 m	151	0.221	1.45	399 800
3	桩径0.5 m,桩间距1.1 m,桩长9.0 m	163	0.286	1.61	382 765(水泥搅拌桩286 324,旋喷桩96 441)

工艺	水泥质量分数为16%的抗压强度/MPa			水泥质量分数为17%的抗压强度/MPa			水泥质量分数为18%的抗压强度/MPa
工艺	上	中	下	上	中	下	上	中	下
四搅两喷	1.21	1.25	1.23	1.30	1.33	1.32	1.34	1.38	1.36
四搅四喷	1.32	1.33	1.33	1.35	1.36	1.35	1.41	1.42	1.42

工艺	水泥质量分数为16%的承载力/kPa	水泥质量分数为17%的承载力/kPa	水泥质量分数为18%的承载力/kPa
四搅两喷	121	132	150
四搅四喷	134	154	172

Treatment of coastal soft foundation with cement-soil mixing pile

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序号	桩号	设计桩长／m	试验龄期	取芯率/%	无侧限抗压强度／MPa			说明	不合格率/%
序号	桩号	设计桩长／m	试验龄期	取芯率/%	最大值	最小值	平均值	说明	不合格率/%
1	2-87＃	8.0	>28	>85	1.85	0.71	1.25	较完整	>10
2	2-1760＃	8.0	>28	>85	6.07	0.46	2.15	较完整	<10
3	2-1835＃	8.0	>28	>85	4.47	0.42	1.70	较完整	<10
4	2-1695＃	8.0	>28	>85	2.15	0.75	1.48	较完整	<10
5	3-518＃	8.0	>28	>85	3.98	1.28	2.67	较完整	<10
6	3-483＃	8.0	>28	>85	5.23	1	2.27	较完整	<10
7	3-1006＃	8.0	>28	>85	1.93	0.46	1.41	较完整	<10
8	3-346＃	8.0	>28	>85	2.07	0.79	1.57	较完整	<10
9	3-375＃	8.0	>28	>85	2.31	0.18	1.58	较完整	<10
10	4-92＃	8.0	>28	>85	2.29	0.31	1.45	较完整	<10
11	4-840＃	8.0	>28	>85	3.21	0.51	1.40	较完整	<10

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