Strength-Deformation Behavior and Engineering Applications of Residual Soil Under Drying-Wetting Cycles and Construction Vibration

doi:10.12141/j.issn.1000-565X.240593

Abstract

Abstract:

Under the coupled effects of drying-wetting cycles and construction vibration, both strength and deformation parameters of residual soil undergo significant degradation, thereby compromising the safety of excavation support systems. Through direct shear tests and consolidation tests, this study characterizes the strength-deformation behavior of residual soil under drying-wetting cycles and construction vibration, develops predictive models for deteriorated parameters, and implements them in high-fidelity numerical simulations of a metro excavation project. The experimental results indicate that: cohesion c undergoes nonlinear decay with increasing drying-wetting cycles n and vibration duration t; internal friction angle φ exhibits oscillatory increase with n, while vibration effects on φ diminish progressively at higher n; without vibration, compression coefficient a_v1-2 increases linearly with n, whereas reference tangent modulus $E o e d r e f$ decreases gradually; under vibration, a_v1-2 shows triphasic evolution: rapid initial decrease slow secondary decrease eventual increase. By considering the effects of drying-wetting cycle and construction vibration, the excavation is divided into 6 impact zones: fully drying-wetting-affected, over drying-wetting-affected, strongly coupled drying-wetting and vibration, weakly coupled drying-wetting-affected, vibration-only, and unaffected. Degraded soil parameters corresponding to each impact zone were implemented in high-fidelity numerical simulations of the excavation sequence. Results reveal that surface settlement first decreases then increases with horizontal distance from the excavation edge. As the excavation depth increases, diaphragm wall horizontal displacement exhibits a “small-large-small” profile along the wall height. Both ground settlement and wall horizontal displacement are consistently smaller on the side adjacent to an existing building than on the unobstructed side. Incorporating the coupled effects of drying and wetting cycling and construction vibration, the simulated surface settlements and wall horizontal displacements match the field measurements more closely, thus providing a practical guidance for the design and construction of the residual soil excavations.

Key words: residual soil, drying-wetting cycle, vibration, strength, deformation, numerical simulation

CLC Number:

TU411.3

CHEN Dongxia, TANG Jiarun, WANG Dongdong, CHEN Bo, ZHANG Jingyi. Strength-Deformation Behavior and Engineering Applications of Residual Soil Under Drying-Wetting Cycles and Construction Vibration[J]. Journal of South China University of Technology(Natural Science Edition), 2025, 53(10): 86-96.

Figures/Tables 23

Fig.1

Fig.2

Fig.3

Table 1

Fig.4

Table 2

Cohesion deterioration under drying-wetting cycle and vibration"

振动时长/min	$ξ t, n / %$
振动时长/min	n = 0	n = 1	n = 2	n = 3	n = 4	n = 5
0	0.0	4.5	10.5	14.8	30.3	35.9
15	26.2	33.1	37.9	40.3	38.8	42.6
30	39.7	36.6	40.6	44.8	44.8	43.1
45	41.4	36.9	41.4	42.8	49.1	58.6

Table 2

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

Fig.12

Fig.13

Fig.14

Table 3

Physical and mechanical parameters of soil"

参数	单位	杂填土	残积砂质黏性土	中风化花岗岩
γ	kN/m³	17	21	18.5
$E 50 r e f$	kN/m²	4 500	10 256	35 000
$E o e d r e f$	kN/m²	4 500	6 410	35 000
$E u r r e f$	kN/m²	13 500	46 793	75 000
c΄	kN/m²	10	29	30
φ΄	°	23	21.4	22
p^ref	kPa	100	100	100

Table 3

Table 4

Table 5

Fig.15

Table 6

Fig.16

Fig.17

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构件	模拟形式	γ/（kN·m^-3）	泊松比	弹性模E/GPa
地下连续墙	2D板单元	24	0.17	30.0
混凝土支撑及腰梁	1D梁单元	25	0.20	31.5
建筑物梁	1D梁单元	25	0.25	30.0
建筑物板	2D板单元	25	0.25	30.0
建筑物柱	1D梁单元	25	0.25	30.0
建筑物桩	植入式梁单元	25	0.25	30.0

阶段编号	模拟内容
1、2	初始渗流场及初始应力场分析
3、4	建筑物施工、地下连续墙施工
5	第1次降水
6	第1层支护及开挖
7	第2次降水
9	第2层支护及开挖
10	第3次降水
12	第3层支护及开挖

影响区域	干湿循环次数	振动时间/min
干湿循环充分影响区	5	0
干湿循环影响过渡区	1	0
共同强影响区	5	45
共同弱影响区	1	15
仅振动影响区	0	45
无影响区	0	0