黏土-混凝土组合体强度及全过程统计损伤模型

doi:10.13229/j.cnki.jdxbgxb.20230253

Abstract

Abstract:

In order to study the influence of small dip angle（0°<θ<30°） contact surface on the strength characteristics of pile-soil composite structure under different influencing factors， the unconsolidated undrained triaxial test on clay-concrete assembled specimens of variable inclination was carried out by TSZ-2 fully automatic triaxial instrument， and the shear strength and failure mechanism of the clay-concrete combined body under different confining pressures and moisture content were discussed. Finally， according to the shear characteristics of the small inclination clay-concrete combined body， the statistical damage model of the small-angle clay-concrete composite was deduced in the whole process. The results show that when the interface inclination of the clay-concrete combined body is 0°<θ<30° and the water content of the soil is 17%， increasing the interface inclination angle of the clay-concrete combined body can improve the shear strength， and as the water content gradually increases， the larger the interface inclination angle of the clay-concrete combined body， the smaller the shear strength of the clay-concrete combined body. The deformations during triaxial loading of the small-angle combined body can be divided into contact surface slip phase， specimen elastic compression and contact surface shear coupling phase， soil sample elastoplastic shear phase. The larger the inclination of the clay-concrete combined body， the bigger the initial damage value under the same conditions， besides， its total damage value increases with the increase of axial strain， and the initial damage value is also affected by the surrounding pressure and water content. Finally， the experimental data and theoretical values of the model are compared， and the overall fit is consistent， which verifies the accuracy and reasonableness of the model.

Key words: traffic engineering, clay-concrete combined body of variable inclination, triaxial shear test, shear mechanism, deformation properties, statistical damage theory

CLC Number:

TU443

Huai-xin LI,Chang-gen YAN,Bin LIN,Yu-ling SHI. Strength and statistical damage model in whole process of clay-concrete combined body[J].Journal of Jilin University(Engineering and Technology Edition), 2025, 55(1): 245-255.

Figures/Tables 13

Table 1

Fig.1

Table 2

Fig.2

Fig.3

Fig.4

Table 3

Mechanical parameters of variable inclination assemblies under different influencing factors"

接触面倾角	围压σ₃/ kPa	w=17%		w=22%		w=27%
接触面倾角	围压σ₃/ kPa	$(σ 1 - σ 3)'$ /kPa	弹性模量E/kPa	$(σ 1 - σ 3)'$ /kPa	弹性模量E/kPa	$(σ 1 - σ 3)'$ /kPa	弹性模量E/kPa
θ₀	100	351.7	94.71	240.2	87.07	140.7	63.49
	200	420.3	112.36	311.7	107.60	157.9	73.00
	300	480.8	129.82	355.0	119.78	168.7	81.16
θ₁	100	379.8	79.96	246.8	77.83	102.5	35.16
	200	509.2	114.41	342.2	110.81	107.4	51.28
	300	636.8	145.11	445.6	138.66	119.9	55.33
θ₂	100	381.5	97.46	239.7	77.26	109.2	21.41
	200	491.2	109.51	298.4	86.94	135.2	29.89
	300	600.6	152.13	361.6	110.34	186.0	42.39

Table 3

Fig.5

Fig.6

Table 4

Fig.7

Fig.8

Fig.9

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倾角θ/（°）	tanθ_i	含水率w/%	围压σ₃/kPa
θ₀	0	17	100、200、300
		22	100、200、300
		27	100、200、300
θ₁	0.25	17	100、200、300
		22	100、200、300
		27	100、200、300
θ₂	0.5	17	100、200、300
		22	100、200、300
		27	100、200、300

围压σ₃/ kPa	倾角θ₀/（°）			倾角θ₁/（°）			倾角θ₂/ （°）
围压σ₃/ kPa	参数C	参数D	相关系数R²	参数C	参数D	相关系数R²	参数C	参数D	相关系数R²
100	1.168 4	-2.843 5	0.982 4	1.515 8	-4.095 9	0.930 7	1.056 6	-2.723 7	0.961 1
200	1.152 1	-2.889 3	0.987 2	1.186 9	-3.307 4	0.944 1	1.772 6	-4.487 4	0.985 6
300	1.125 0	-2.886 2	0.980 2	1.283 3	-3.473 5	0.979 4	1.272	-3.231 1	0.991 3

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Strength and statistical damage model in whole process of clay-concrete combined body

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