CN111581694A - Method and device for evaluating stability of creeping landslide - Google Patents
Method and device for evaluating stability of creeping landslide Download PDFInfo
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Abstract
The invention provides a method and a device for evaluating stability of a creeping landslide, which can improve the reliability of evaluating the stability of the creeping landslide. The method comprises the following steps: under the condition that the initial condition information of the slip is changed due to environmental variation, establishing a creep-type landslide mechanical model; according to the established creeping landslide mechanical model, establishing a creeping landslide stability model for calculating a stability coefficient; and evaluating the stability of the creeping landslide according to the stability coefficient obtained by calculation. The method is suitable for evaluating the stability of the creeping landslide.
Description
Technical Field
The invention relates to the technical field of slope control, in particular to a method and a device for evaluating stability of a creeping landslide.
Background
The creeping landslide can generate a large amount of ground cracks, change the angle of a slope surface and the fluctuation of the terrain, seriously threaten the life and property safety of people once the creeping landslide is changed into the catastrophic landslide, and is a main geological disaster for damaging the infrastructure. Therefore, the method has important scientific significance and engineering application value for scientific stability evaluation of the creeping landslide.
More and more studies have shown that the breaking movement has a decisive influence on the development of a creeping type landslide. Therefore, once the trailing edge slope body located near the fault has environmental variation such as slope body settlement, the necessary condition for generating impact kinetic energy to the leading edge slope body is necessarily existed, and the creeping type landslide has larger kinetic energy in accelerated deformation and deep rock body before sliding.
However, the conventional limit balancing method and numerical simulation method do not consider the information of the slip initial condition changed by the environmental variation such as the settlement of the slope body, so that the step-like deformation of the creep-type landslide cannot be accurately explained, and the stability of the creep-type landslide cannot be accurately evaluated.
Disclosure of Invention
The invention aims to provide a method and a device for evaluating the stability of a creeping landslide, and aims to solve the problem that the stability of the creeping landslide cannot be accurately evaluated in the prior art.
In order to solve the technical problem, an embodiment of the present invention provides a method for evaluating stability of a creep-type landslide, including:
under the condition that the initial condition information of the slip is changed due to environmental variation, establishing a creep-type landslide mechanical model;
according to the established creeping landslide mechanical model, establishing a creeping landslide stability model for calculating a stability coefficient;
and evaluating the stability of the creeping landslide according to the stability coefficient obtained by calculation.
Further, the established creep-type landslide mechanical model is represented as:
FS＝ηWbΔh
wherein F is the impact force generated by the trailing edge slope body settlement, S is the impact displacement, η is the energy conversion coefficient of the trailing edge settlement slope body, and W is the energy conversion coefficient of the trailing edge settlement slope bodybIs the trailing edge slope body gravity; and deltah is the trailing edge slope body settlement.
Further, before the stability coefficient calculation is performed by establishing a creep-type landslide stability model according to the established creep-type landslide mechanical model, the method further comprises the following steps:
measuring slope parameters;
wherein the determined slope parameters include: the slope creep slip front and back sliding surface inclination angle variation, the unit width slip body gravity, the slope sliding surface inclination angle, the cohesion force, the internal friction angle, the length of the slope substrate in the sliding direction, the included angle between the trailing edge crack and the horizontal plane, the hydrostatic thrust in the slope trailing edge crack and the sliding surface substrate uplift pressure.
Further, the step of establishing a creep-type landslide stability model for stability coefficient calculation according to the established creep-type landslide mechanical model comprises:
establishing a creeping type landslide stability model for calculating a stability coefficient based on impact force generated by trailing edge slope settlement and slope creep front and rear slip plane inclination angle variation of the slope;
wherein, the established creep-type landslide stability model is expressed as:
wherein, KfThe coefficient of stability, delta α is the variation of the inclination angle of the front and rear sliding surfaces of the creeping slope body, F is the impact force generated by the settlement of the trailing edge slope body, PpuHydrostatic thrust in a crack at the rear edge of the slope body; pupThe coefficient of gravity is the sliding surface base uplift force, W is the unit width sliding body gravity, α is the slope sliding surface inclination angle, c is the cohesive force;
is an internal friction angle; l is the length of the slope body base along the sliding direction; theta is the included angle of the trailing edge crack and the horizontal plane.
The embodiment of the invention also provides a creep-type landslide stability evaluation device, which comprises:
the establishing module is used for establishing a creep-type landslide mechanical model under the condition that the initial condition information of the slip is changed due to environmental variation;
the determining module is used for establishing a creep-type landslide stability model for stability coefficient calculation according to the established creep-type landslide mechanical model;
and the evaluation module is used for evaluating the stability of the creeping landslide according to the stability coefficient obtained by calculation.
Further, the established creep-type landslide mechanical model is represented as:
FS＝ηWbΔh
wherein F is the impact force generated by the trailing edge slope body settlement, S is the impact displacement, η is the energy conversion coefficient of the trailing edge settlement slope body, and W is the energy conversion coefficient of the trailing edge settlement slope bodybIs the trailing edge slope body gravity; and deltah is the trailing edge slope body settlement.
Further, the apparatus further comprises:
the measuring module is used for measuring the slope parameters;
wherein the determined slope parameters include: the slope creep slip front and back sliding surface inclination angle variation, the unit width slip body gravity, the slope sliding surface inclination angle, the cohesion force, the internal friction angle, the length of the slope substrate in the sliding direction, the included angle between the trailing edge crack and the horizontal plane, the hydrostatic thrust in the slope trailing edge crack and the sliding surface substrate uplift pressure.
Further, the determining module is used for establishing a creeping type landslide stability model for calculating the stability coefficient based on the impact force generated by the settlement of a rear edge slope body and the inclination angle variation of the front and rear creeping sliding surfaces of the slope body;
wherein, the established creep-type landslide stability model is expressed as:
wherein, KfThe coefficient of stability, delta α is the variation of the inclination angle of the front and rear sliding surfaces of the creeping slope body, F is the impact force generated by the settlement of the trailing edge slope body, PpuHydrostatic thrust in a crack at the rear edge of the slope body; pupThe coefficient of gravity is the sliding surface base uplift force, W is the unit width sliding body gravity, α is the slope sliding surface inclination angle, c is the cohesive force;
is an internal friction angle; l is the length of the slope body base along the sliding direction; theta is the included angle of the trailing edge crack and the horizontal plane.
The technical scheme of the invention has the following beneficial effects:
in the scheme, under the condition that the initial condition information of the slip is changed due to environmental variation, a creep-type landslide mechanical model is established; according to the established creeping landslide mechanical model, establishing a creeping landslide stability model for calculating a stability coefficient; and evaluating the stability of the creeping landslide according to the stability coefficient obtained by calculation, so that the reliability and the accuracy of the stability evaluation of the creeping landslide can be improved.
Drawings
FIG. 1 is a schematic flow chart of a method for evaluating stability of a creep-type landslide according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating deformation before and after settlement of a creep-type landslide according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the stress of a creep-type landslide after settlement according to an embodiment of the present invention;
FIG. 4(a) is a schematic diagram of a creeping type landslide according to an embodiment of the present invention;
FIG. 4(b) is a schematic cross-sectional view of the interior of a slope body according to an embodiment of the present invention;
FIG. 5(a) is a schematic illustration of the internal settlement of a trailing edge ramp provided by an embodiment of the present invention;
FIG. 5(b) is a schematic illustration of landslide creep deformation during trailing edge subsidence as provided by an embodiment of the present invention;
FIG. 6 is a diagram illustrating an intent to creep after landslide according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating a stability factor calculation result considering initial condition variation according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a creep-type landslide stability evaluation device provided in an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a method and a device for evaluating stability of a creeping landslide, aiming at solving the problem that the stability of the creeping landslide cannot be accurately evaluated at present.
Example one
As shown in fig. 1, a method for evaluating stability of a creep-type landslide according to an embodiment of the present invention includes:
s101, under the condition that the initial condition information of the slip is changed due to environmental variation, establishing a creep-type landslide mechanical model;
s102, establishing a creep-type landslide stability model for stability coefficient calculation according to the established creep-type landslide mechanical model;
s103, evaluating the stability of the creeping landslide according to the stability coefficient obtained by calculation, specifically: when the calculation stability coefficient is more than or equal to 1, creep deformation damage cannot occur; when the stability factor is less than 1, creep deformation failure may occur.
According to the method for evaluating the stability of the creeping landslide, disclosed by the embodiment of the invention, under the condition that the initial condition information of the creeping landslide is changed due to environmental variation, a mechanical model of the creeping landslide is established; according to the established creeping landslide mechanical model, establishing a creeping landslide stability model for calculating a stability coefficient; and evaluating the stability of the creeping landslide according to the stability coefficient obtained by calculation, so that the reliability and the accuracy of the stability evaluation of the creeping landslide can be improved.
In a specific embodiment of the method for evaluating stability of a creeping landslide, the mechanical model of the creeping landslide is further represented as:
FS＝ηWbΔh
wherein F is the impact force generated by the trailing edge slope body settlement, S is the impact displacement, η is the energy conversion coefficient of the trailing edge settlement slope body, and W is the energy conversion coefficient of the trailing edge settlement slope bodybIs the trailing edge slope body gravity; and deltah is the trailing edge slope body settlement.
In this embodiment, the established creep-type landslide mechanical model considers the information of the initial condition of the slip changed by the environmental variation such as the settlement of the slope body, for example, the impact force generated by the settlement of the slope body at the rear edge, as shown in fig. 2, when the slope body at the rear edge generates larger settlement, the slope body generates larger gravitational potential energy and larger impact kinetic energy to the slope body at the front edge, thereby causing the variation of the down-sliding force; at the same time, the inclination angle of the sliding surface is inevitably changed. Therefore, the above two points need to be considered in the stability calculation of the creep type landslide. When the trailing edge slope body generates larger settlement, the impact energy generated by the trailing edge slope body to the leading edge slope body needs to be considered in the stress analysis of the slope body, and the inclination angle alpha of the sliding surface of the slope body is corrected, as shown in fig. 3.
In a specific embodiment of the method for evaluating stability of creeping sliding slope, the establishing a model of stability of creeping sliding slope for calculating stability coefficient according to the established model of mechanics of creeping sliding slope further includes:
establishing a creeping type landslide stability model for calculating a stability coefficient based on impact force generated by trailing edge slope settlement and slope creep front and rear slip plane inclination angle variation of the slope;
wherein, the established creep-type landslide stability model is expressed as:
wherein, KfThe coefficient of stability, delta α is the variation of the inclination angle of the front and rear sliding surfaces of the creeping slope body, F is the impact force generated by the settlement of the trailing edge slope body, PpuHydrostatic thrust in a crack at the rear edge of the slope body; pupRaising the pressure for the sliding surface substrate; w is aPotential width sliding body gravity, α is the slope sliding surface inclination angle, c is cohesive force;
is an internal friction angle; l is the length of the slope body base along the sliding direction; theta is the included angle of the trailing edge crack and the horizontal plane.
In this embodiment, in order to calculate the stability coefficient by using the established creep-type landslide stability model, the following slope parameters need to be measured: the slope creep slip front and back sliding surface inclination angle variation, the unit width slip body gravity, the slope sliding surface inclination angle, the cohesion force, the internal friction angle, the length of the slope substrate in the sliding direction, the included angle between the trailing edge crack and the horizontal plane, the hydrostatic thrust in the slope trailing edge crack and the sliding surface substrate uplift pressure.
In this embodiment, in order to further verify the effectiveness of the established creep-type landslide stability model, a theoretical simulation experiment is performed on the creep-type landslide. FIG. 4 is a photograph of a model experiment, wherein the model box is a transparent glass box with 5cm grid lines for observing the settlement of a creeping type landslide body, the change of a sliding surface and the like; sponge and staggered corrugated paper are preset at the lower part of the slope body to simulate a fracture zone located below the slope body, as shown in figure 4. The whole process of the trailing edge slope body settling and descending slope body creeping and sliding is simulated under the conditions of rainfall, underground water level lifting and the like, and parameters related to the experiment are shown in a table 1.
TABLE 1 model experiment slope body calculation parameters
In this embodiment, the density of the slope body may be used to calculate the mass of the slope body, and further calculate the gravity of the slope body; the density of water can be used for calculating hydrostatic thrust and sliding surface uplift pressure in a crack at the trailing edge of the slope body.
At the beginning of the experiment, water was injected to the trailing edge of the slope at 10cm, 15cm and 20cm at 0, 150 and 300min, respectively. In the initial stage of the experiment, when the water injection height is only 10cm at 100min, the rear edge of the slope body begins to generate obvious collapse, and fig. 5(a) shows the settlement fracture of the rear edge of the landslide. At the same time as the trailing edge of the landslide subsides, the landslide body undergoes creep displacement, as shown in FIG. 5 (b). The settlement of the slope body on the fault zone and the like inevitably cause that the initial kinetic energy of the front edge sliding body is not from zero, namely creep change is generated under the condition of a smaller water level working condition, and the experimental observation result is identical with the observation result of partial creep type landslide.
Under the dual effects of the stage settlement of the slope body at the rear edge and the continuous lifting of the underground water level, creep displacement continuously occurs within 250min and 400min, finally the top end of the slope body sinks more seriously and has a large number of cracks, and the horizontal displacement deformation of the landslide is expanded to 0.8cm, as shown in figure 6.
Experiments show that when the slope body on the fault zone is vertically settled, the front edge shows larger horizontal displacement and tension fracture. The experimental group results are consistent with the deformation characteristics of a plurality of creeping type landslides: that is, the trailing edge of the landslide exhibits great vertical settlement, while the leading edge exhibits creep-type slip, which further evidences the variation in initial conditions caused by the settlement of the trailing edge slope sitting on the fault zone from the side, with adverse effects on slope stability.
When the landslide is subjected to large creep change, the stability coefficients obtained by the traditional method are all more than 3.5. Especially, in three periods when the accumulated displacement is changed greatly, the stability coefficient is not changed greatly, which contradicts with the experimental observation result. Therefore, when stability evaluation is performed on a creeping type landslide with a steep trailing edge slope, if slip initial condition information changed without considering environmental variation such as trailing edge slope settlement and gliding exists, a stability coefficient calculation result has a large error, and analysis on the stepped deformation of the creeping type landslide cannot be realized.
The trailing edge slope subsidence, etc. sitting on the fault band necessarily results in the initial kinetic energy of the slope not starting from zero. As can be seen from fig. 2, once a large settlement deformation occurs, the stability of the landslide is certainly influenced greatly, on one hand, the gravitational potential energy of the trailing edge slope body is converted into kinetic energy, the creep of the landslide is certainly impacted, and on the other hand, the inclination angle of the sliding surface is also significantly varied. Environmental variations such as fracture zone activity or fault settlement cause the initial kinetic energy of the landslide to be not 0, and the method is a main reason that the analysis of the step-shaped deformation of the creeping landslide cannot be realized by traditional stability evaluation.
Table 2 shows the stability factor comparison at the time of initial condition variation in the experiment. As can be seen from Table 2, the impact force reaches 890N or more at the 100min, 250min and 400min when the trailing edge slope body is subjected to large settlement, so that the stability coefficients are once reduced to 0.99, 0.93 and 0.98, which basically accords with the actual results. Therefore, when evaluating the stability of a creep-type landslide that is sitting on a fault zone, it is necessary to consider the variation of the initial environmental information to make the stability evaluation result more reliable.
TABLE 2 comparison of stability coefficients at varying initial conditions
| Time of day | Initial kinetic energy | F | The invention | Whether or not to coincide with reality |
| 100Min | 0.76J | 950.6N | 0.99 | Anastomosis |
| 250Min | 3.14J | 982.6N | 0.93 | Anastomosis |
| 400Min | 3.57J | 891.4N | 0.98 | Anastomosis |
Fig. 7 shows the calculation result of the stability coefficient of the sliding impact force in consideration of the initial condition variation. As can be seen from FIG. 7, when the settlement is large, the landslide is subjected to large creep change when the stability coefficients of the impact force of the downward falling of the settlement of the slope body are all reduced to be below 1.0; when the settlement is stable, the stability coefficient is recovered to 1.0 or more than 1.0, the slope body is in a relatively stable state, and creep deformation damage cannot occur. Based on the evaluation result of the creep-type landslide stability model, the step deformation of the creep-type landslide is accurately simulated.
Example two
The present invention also provides a specific embodiment of a creep-type landslide stability evaluation device, which corresponds to the specific embodiment of the creep-type landslide stability evaluation method, and the device can implement the object of the present invention by executing the flow steps in the specific embodiment of the method, so the explanation in the specific embodiment of the creep-type landslide stability evaluation method is also applicable to the specific embodiment of the creep-type landslide stability evaluation device provided by the present invention, and will not be repeated in the following specific embodiment of the present invention.
As shown in fig. 8, an embodiment of the present invention further provides a creep-type landslide stability evaluation device, including:
the establishing module 11 is used for establishing a creep-type landslide mechanical model under the condition that the initial condition information of the slip is changed due to environmental variation;
the determining module 12 is configured to establish a creep-type landslide stability model for stability coefficient calculation according to the established creep-type landslide mechanical model;
and the evaluation module 13 is used for evaluating the stability of the creeping landslide according to the stability coefficient obtained by calculation.
According to the creep-type landslide stability evaluation device disclosed by the embodiment of the invention, under the condition that the initial condition information of the creep-type landslide is changed due to environmental variation, a creep-type landslide mechanical model is established; according to the established creeping landslide mechanical model, establishing a creeping landslide stability model for calculating a stability coefficient; and evaluating the stability of the creeping landslide according to the stability coefficient obtained by calculation, so that the reliability and the accuracy of the stability evaluation of the creeping landslide can be improved.
In a specific embodiment of the above creep-type landslide stability evaluation apparatus, the established creep-type landslide mechanical model is further represented as:
FS＝ηWbΔh
wherein F is the impact force generated by the trailing edge slope body settlement, S is the impact displacement, η is the energy conversion coefficient of the trailing edge settlement slope body, and W is the energy conversion coefficient of the trailing edge settlement slope bodybIs the trailing edge slope body gravity; and deltah is the trailing edge slope body settlement.
In an embodiment of the above creep-type landslide stability evaluation device, further, the device further includes:
the measuring module is used for measuring the slope parameters;
wherein the determined slope parameters include: the slope creep slip front and back sliding surface inclination angle variation, the unit width slip body gravity, the slope sliding surface inclination angle, the cohesion force, the internal friction angle, the length of the slope substrate in the sliding direction, the included angle between the trailing edge crack and the horizontal plane, the hydrostatic thrust in the slope trailing edge crack and the sliding surface substrate uplift pressure.
In a specific embodiment of the above creep-sliding type landslide stability evaluation device, further, the determination module is configured to establish a creep-sliding type landslide stability model for calculating a stability coefficient based on an impact force generated by trailing edge slope settlement and a slope creep front and rear slip plane inclination angle variation of a slope body;
wherein, the established creep-type landslide stability model is expressed as:
wherein, KfThe coefficient of stability, delta α is the variation of the inclination angle of the front and rear sliding surfaces of the creeping slope body, F is the impact force generated by the settlement of the trailing edge slope body, PpuHydrostatic thrust in a crack at the rear edge of the slope body; pupThe coefficient of gravity is the sliding surface base uplift force, W is the unit width sliding body gravity, α is the slope sliding surface inclination angle, c is the cohesive force;
is an internal friction angle; l is the length of the slope body base along the sliding direction; theta is the included angle of the trailing edge crack and the horizontal plane.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A method for evaluating stability of a creep-type landslide, comprising:
under the condition that the initial condition information of the slip is changed due to environmental variation, establishing a creep-type landslide mechanical model;
according to the established creeping landslide mechanical model, establishing a creeping landslide stability model for calculating a stability coefficient;
and evaluating the stability of the creeping landslide according to the stability coefficient obtained by calculation.
2. The method for evaluating stability of a creeping landslide according to claim 1, wherein the mechanical model of the creeping landslide is established as:
FS＝ηWbΔh
wherein F is the impact force generated by the trailing edge slope body settlement, S is the impact displacement, and η is the energy conversion of the trailing edge settlement slope bodyA coefficient; wbIs the trailing edge slope body gravity; and deltah is the trailing edge slope body settlement.
3. The method for evaluating stability of creeping landslide according to claim 1, wherein before the stability coefficient calculation is performed by establishing a creeping landslide stability model according to the established creeping landslide mechanical model, the method further comprises:
measuring slope parameters;
wherein the determined slope parameters include: the slope creep slip front and back sliding surface inclination angle variation, the unit width slip body gravity, the slope sliding surface inclination angle, the cohesion force, the internal friction angle, the length of the slope substrate in the sliding direction, the included angle between the trailing edge crack and the horizontal plane, the hydrostatic thrust in the slope trailing edge crack and the sliding surface substrate uplift pressure.
4. The method for evaluating stability of a creeping landslide according to claim 1, wherein the establishing of a creeping landslide stability model for stability coefficient calculation according to the established creeping landslide mechanical model comprises:
establishing a creeping type landslide stability model for calculating a stability coefficient based on impact force generated by trailing edge slope settlement and slope creep front and rear slip plane inclination angle variation of the slope;
wherein, the established creep-type landslide stability model is expressed as:
wherein, KfThe coefficient of stability, delta α is the variation of the inclination angle of the front and rear sliding surfaces of the creeping slope body, F is the impact force generated by the settlement of the trailing edge slope body, PpuHydrostatic thrust in a crack at the rear edge of the slope body; pupThe coefficient of gravity is the sliding surface base uplift force, W is the unit width sliding body gravity, α is the slope sliding surface inclination angle, c is the cohesive force;
is inner frictionAn angle; l is the length of the slope body base along the sliding direction; theta is the included angle of the trailing edge crack and the horizontal plane.
5. A creep-type landslide stability evaluation device, comprising:
the establishing module is used for establishing a creep-type landslide mechanical model under the condition that the initial condition information of the slip is changed due to environmental variation;
the determining module is used for establishing a creep-type landslide stability model for stability coefficient calculation according to the established creep-type landslide mechanical model;
and the evaluation module is used for evaluating the stability of the creeping landslide according to the stability coefficient obtained by calculation.
6. The device for evaluating stability of creep-type landslide according to claim 5, wherein the mechanical model of creep-type landslide is established as:
FS＝ηWbΔh
wherein F is the impact force generated by the trailing edge slope body settlement, S is the impact displacement, η is the energy conversion coefficient of the trailing edge settlement slope body, and W is the energy conversion coefficient of the trailing edge settlement slope bodybIs the trailing edge slope body gravity; and deltah is the trailing edge slope body settlement.
7. The creep-type landslide stability evaluation device of claim 5, further comprising:
the measuring module is used for measuring the slope parameters;
wherein the determined slope parameters include: the slope creep slip front and back sliding surface inclination angle variation, the unit width slip body gravity, the slope sliding surface inclination angle, the cohesion force, the internal friction angle, the length of the slope substrate in the sliding direction, the included angle between the trailing edge crack and the horizontal plane, the hydrostatic thrust in the slope trailing edge crack and the sliding surface substrate uplift pressure.
8. The creep-type landslide stability evaluation device according to claim 5, wherein the determination module is used for establishing a creep-type landslide stability model for stability coefficient calculation based on impact force generated by trailing edge slope settlement and slope creep front and rear slip plane inclination angle variation of a slope;
wherein, the established creep-type landslide stability model is expressed as:
wherein, KfThe coefficient of stability, delta α is the variation of the inclination angle of the front and rear sliding surfaces of the creeping slope body, F is the impact force generated by the settlement of the trailing edge slope body, PpuHydrostatic thrust in a crack at the rear edge of the slope body; pupThe coefficient of gravity is the sliding surface base uplift force, W is the unit width sliding body gravity, α is the slope sliding surface inclination angle, c is the cohesive force;
is an internal friction angle; l is the length of the slope body base along the sliding direction; theta is the included angle of the trailing edge crack and the horizontal plane.
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